The Impact of Shark Finning and Shark Fin Soup

"Sharks are among the most perfectly constructed creatures in nature. Some forms have survived for two hundred million years".

  Eugenie Clark



Millions of bowls of this soup are served each year— not your typical chicken noodle soup or a hearty veggie soup, but rather a historical and cultural delicacy: shark fin soup.

This soup has its prestigious roots in the Ming Dynasty of China. Originally, the soup was served by ancient Chinese emperors to honour guests; the shark fin was thought to have medicinal benefits and the conquering of such a rare “beast” had also symbolized the power and wealth of the emperor. It gained more popularity during the subsequent Chinese dynasties, eventually becoming considered as a tradition in formal banquets and ceremonies.


Unfortunately, the production of shark fin soup has proven to be disastrous for shark populations. The process of procuring the fins of sharks for this delicacy— in a practice called shark finning—is a major cause of rapidly plummeting shark populations across the globe. In fact, the population of multiple shark species have been reduced by 80% or more in the past 50 years due to shark finning. Along with other causes, shark finning has contributed to more than 60% of shark species are threatened—the highest proportion among all vertebrate groups.


Shark finning is the practice of removing the shark fins after the shark has been caught. Once a shark has been caught, all of the shark’s fins are targeted and sliced off. Shark finning occurs across almost all species of sharks, with the average price of shark fins reaching over $400 US per kilogram. However, the body of the shark itself will only sell for an average of $0.50 US per kilogram— evidently not enough for fishermen to justify keeping the entire shark, causing the overwhelming majority of the sharks to be disposed of back into the ocean. As a result, the shark is left to a slow and painful death. The sharks are unable to swim without its fins and, as a result, cannot absorb adequate amounts oxygen through its gills—a process that occurs mostly as sharks swim. The sharks eventually suffocate or bleed out in the ocean.


The cultural significance of shark fin soup had not faded— in fact, demand has only increased across Asia since the Ming Dynasty as more people are becoming financially capable of affording what was once considered as an elite, luxury dish. Across the whole of China, shark fin soup is a staple during formal events and ordered at restaurants as a means to impress dinner guests. Though increased awareness regarding the ethical issues of shark fin soup has surfaced during the past decade, it remains a staple in Chinese culture as a symbol of wealth and generosity. The estimated cost of this industry is more than the global chewing gum industry: upwards of US$1.2 billion.


Surveys show that the majority of Chinese do not understand how shark fin soup is made, and many aren’t even aware that the fins come from sharks themselves. “Shark fin soup” is translated to “fish fin soup” in Mandarin and Cantonese, leading many Asians to incorrectly believe that the fins come from common species of fish. Thankfully, recent advertisements in mainland China has contributed to increased awareness of the origins of shark fin soup, leading to a decline in demand in parts of China and Hong Kong in recent years.

Yao Ming, a famous Chinese NBA basketball player, has been credited with changing public perceptions of shark fin soup in mainland China and Hong Kong through his involvement in raising awareness regarding the origins of the shark fin.

One example of how this practice has affected shark populations is seen in the species of oceanic whitetip sharks. The oceanic whitetip shark is one of many shark species that is highly valued in the international shark fin trade, and has been heavily targeted in its local tropical and sub-tropical waters as a result. In its local habitat—usually off-shore, deep-ocean areas—the oceanic whitetip shark is considered the top predator, eating mostly pelagic cephalopods, bony fish, and squid. These sharks have a distinctive pattern of mottled white markings on the tips of their fins, hence why they are called “whitetip” sharks.

Once abundant, the oceanic whitetip shark is currently seeing steep declines in its populations with low likelihoods of recovery. This can be attributed to their low reproductive output and their late age of maturity and reproduction. Oceanic whitetip sharks also swim slowly and near the surface of the ocean, making them prone to becoming caught by fishermen. Their large, distinct fins are also valued highly in the shark fin trade. Just this year, NOAA Fisheries has classified the species as threatened under the Endangered Species Act.

Although increased protections have been taking place in recent years across many countries, involving both the catching and distribution of shark fins, shark finning still remains a significant threat to shark populations around the world. The majority of shark fins originates from less economically developed countries, such as Costa Rica, Taiwan, and Indonesia, as well as on the high seas. Little to no enforcement is taking place in such areas, causing most catches to go unmonitored. Many difficulties arise in enforcing sustainable fishing practices in such remote where annual shark catches often exceed 100,000 tonnes, for an estimated total of 100 million sharks killed. This number could potentially be grossly underestimated, as many fins are illegally retrieved and distributed across remote ports with little oversight, therefore remaining unreported in global statistics.

The killing of a shark for shark fin soup differs from the global meat industry in many ways. Most importantly, sharks are an integral part of their ecosystem. As an apex predator, sharks play an important role in regulating population levels of all species in its ecosystem. More specifically, sharks keep the balance in marine populations to maintain species diversity and will remove weak organisms to help with natural selection. Thus, the process of removing sharks for shark fin soup will not only endanger sharks, but also the marine ecosystem of the shark as well. The killing of a shark for its fins is also unnecessarily cruel; an entire organism is killed only for a small segment to be consumed. The shark, a sentient and oftentimes intelligent animal, is left to die a slow, painful death. And, to make matters worse, the actual fin of the shark does not contribute to the taste or consistency of the soup.

Very recently, the demand for shark fin soup has been on the decline in Hong Kong and mainland China as more people are exposed to ethical issues behind the practice of obtaining the shark fin. Yet, the cultural significance of shark fin soup still remains, and, despite the decrease in demand in some parts of Asia, other countries—namely Vietnam and Macau—has seen a surge in demand. Fortunately, younger generations, who have had less exposure to the cultural significance of shark fin soup, are more conscientious of the issues behind the shark fin and place less emphasis on its cultural role. Hopefully, this trend will continue as future generations will take up their parent’s stances—placing more value on the shark, and less value on the outdated cultural tradition of shark fin soup.


If you are travelling in Asia, you can contribute to the livelihood of sharks and their native ecosystems by saying “no” to shark fin soup and encouraging others to do so as well. Especially in places such as Thailand, Indonesia, and Hong Kong, where shark fin soup is sold relatively cheaply by local street vendors, it is imperative to discourage the widespread distribution. As people stop supporting these shark fin soup vendors, the demand for shark fin soup will decrease, eventually forcing local vendors to stop selling the product. Despite the current widespread distribution of shark fins, progress is being made as more and more people begin to speak up against the injustice. A change in attitude may just be on the horizon.


Posted by: Ning Jiang



Works Cited:

"Appetite for shark fin soup drives massive shark population decline." University of British Columbia,

"The Bitter Truth behind Shark Fin Soup." Bali Animal Welfare Association,

Collins, Nick. "Oceanic whitetip shark: ten facts." The Telegraph,

Fairclough, Caty. "Shark Finning: Sharks Turned Prey." Smithsonian,

"I'm Finished with Fins." Shark Savers, WildAid,

McCarthy, Joe. "Shark Fin Soup Is Pushing Sharks to Extinction — Yet It’s Still Served." Global Citizen,

"Oceanic whitetip shark." Fisheries and Oceans Canada, Government of Canada,

"Oceanic Whitetip Shark." NOAA Fisheries, National Oceanic and Atmospheric Administration,

"Oceanic Whitetip Shark." Oceana,

"Say #Nosharkfin." World Wildlife Foundation,

"Shark Finning." AnimalJustice,

"Shark finning." Wikipedia,

"SHARKS." WildAid,

"What Is Shark Finning?" Stop Shark Finning,

"Why Does Shark Finning Happen?" PADI,

Yeung, Karen A. "The Politics of Shark Fin Soup." Paws for Hope,


The Impact of Marine Debris:


“Marine debris is defined as any persistent solid material that is manufactured or processed and directly or indirectly, intentionally or unintentionally, disposed of or abandoned into the marine environment or the Great Lakes” - National Oceanic and Atmospheric Administration (NOAA)

Pipe fish sailing in a straw in Koh Tao (Thailand)


In short, marine debris can include anything— ranging from fishing nets, lines, plastic bottles, to glass.

And it has a catastrophic effect on marine life.


But first of all, where does it come from?


The overwhelming majority of marine debris results from human activity, and nearly 80% of marine debris originates from land-based sources. There are no confirmed estimates about how much marine debris is in the ocean, but research voyages across the globe have found expansive patches of garbage accumulating in the ocean as a result of ocean currents.

One of the most prominent garbage patches found in the North Pacific Gyre, referred to as the Great Pacific Garbage Patch, has increased 5-fold in the last 10 years. It is estimated to be one to two times the size of Texas, USA.

Marine debris may enter water sources directly from a ship, or indirectly when washed out to sea via rivers, streams and storm drains. It can travel for hundreds of thousands of miles on ocean currents, posing a threat to ocean ecosystems and wildlife along the way. People may contribute to the accumulation of marine debris by:


  • The inappropriate disposal of trash from land-­based activities;
  • Release of waste from shore­based solid waste disposal and waste processing facilities;
  • Abandoning fishing gear, including line, nets, ropes, bait boxes, fish tags and trawl floats;
  • Intentional or inadvertent discharge of trash, galley waste and boating materials;
  • Inappropriate handling of undersea exploration and oil and gas extraction items.




Much of the marine debris found in oceans do not decompose in seawater and can remain in the marine environment for many, many years. Depending on the material, some products may even remain in the ocean for tens of thousands of years!

In coastal areas, especially in coral reefs, fishing gear is prone to trap and even kill marine animals, a phenomenon known as “ghost fishing. Fishing line or nets, strapping bands or even plastic, six-pack rings can greatly affect the mobility of marine animals. Once entangled within marine debris, the animals can have trouble eating, breathing or swimming, all of which can have fatal results. Many animals can choke on small, everyday items, mistaking them for food. A prime example is plastic bags; sea turtles often mistake the plastic bags for jellyfish and attempts to eat them, eventually choking and suffocating to death. Furthermore, many endangered albatross birds and chicks have been found dead with stomachs full of plastic, including bottle caps and cigarette lighters. Even if the animal does not immediately choke to death, the debris within their stomachs can give them a false feeling of being full, and so the animal may die of starvation as a result.



Furthermore, marine debris can provide a habitat for marine species, such as oysters, barnacles, or plants, to collect upon. As debris is carried away by the currents, the organisms living on the debris are carried along far distances and may potentially end up in a completely new environment. Some of these organisms can become an invasive species in the new area they are in, and thus have a negative effect on the native species.


Marine debris also leads to microplastics— an issue that is recently gaining traction across the world; they are classified as plastic particles less than five millimeters in length, and they have a huge negative impact within the marine ecosystem, and for humans. Because is is still an emerging field of study, not a lot is known about microplastics and their long-term impacts yet. However, the current findings show a growing problem.


The worst part, the microplastics:

Plastics degrade incredibly slowly, often over hundreds, and if not, thousands of years. The biggest problem is that they are ingested by many marine organisms, and therefore the plastics have a tendency to move within the food web. Contaminated plastics can break down into small pieces resembling food—such as plankton—for the animals to eat, become embedded in animals' tissue through ingestion or respiration, and sink towards the bottom of the ocean, from where they may be ingested by bottom feeders. The plastic debris ingested by animals can absorb many toxic, hormone-disrupting chemicals like Polychlorinated biphenyls (PCBs) and Dichloro-Diphenyl-Trichloroethane (DDT) which resides in seawater. When the plastics are ingested by marine species, they are spread into the food chain and can affect many marine animals. Studies in the North Pacific Central Gyre, where the Great Pacific Garbage Patch is, found that approximately 35% of the fish had ingested plastic.


Unfortunately, corals are also affected by microplastics. Recent experimentation shows that Scleractinian corals, which are primary reef-builders, may ingest microplastics under laboratory conditions. While the effects of ingestion on these corals has not been conclusive, corals can easily become stressed and bleach; microplastics have been shown to stick to the exterior of the corals after exposure in the laboratory, which can potentially be harmful as corals cannot handle sediment or any particulate matter on their exterior. The coral, in turn, slough it off by secreting mucus, and they expend a large amount of energy in the process, increasing the chances of mortality.

Main references:

By Ning Jiang



Weather, climate and environment; the crucial engagement

"Anything else you are interested in is not going to happen if you can't breathe the air and drink the water. Don's sit this one out. Do something. You are by accident of fate alive at an absolutely critical moment in the history of our planet" - Carl Sagan


The climate change project on Koh Tao aims to further understand the changes in climate and ocean parameters around the island and in the future, the aim is to also be able to identify any effects of these changing parameters and how they are being influenced by climate change and global warming.

We can use past climate records to predict future changes but with the current data constantly being recorded by the weather station, hopefully it will be possible to explain any changes occurring in those predictions. On Koh Tao, measurements that are being taken include wind speed and direction, precipitation or rainfall and atmospheric pressure and humidity. These parameters could give a good indication of a storm system. With climate change there is evidence for increasing storm intensity and potentially frequency however little research has been conducted around the island of Koh Tao about the influences this could have on the island ecosystems including coral reefs. Changes in these parameters cause fluctuations in mixing and vertical gradients and fronts.

Other ocean parameters being recorded include water pH, salinity, dissolved oxygen, nutrient content and temperature. All these factors influence each other and are related to the atmospheric conditions. The ocean-atmosphere circulatory system is important in controlling the ocean environments. For example, with an increasing atmospheric temperature, the ocean temperature will rise. This means less gases are absorbed and so more carbon dioxide may remain in the atmosphere contributing to the ozone layer, along with other effects of a warming climate, including melting icecaps and increased ocean salinity.

As we pump more greenhouse gases into the atmosphere (measured on the weather station as equivalent CO2), we will be able to track the influence this has on the ocean parameters, for example increasing CO2 absorption into the ocean will cause the pH to decrease, this process is known as ocean acidification and can have adverse effects on many organisms in the ocean including calcifying corals and plankton. These projects of Koh Tao and around the world should help us understand the local changes in environment and maybe how specific areas of the world are effected in different ways.

One of the other negative changes to the environment is the increasing introduction of plastics and micro plastics into the environment. With an understanding of the currents around Koh Tao for example, we may be able to identify areas more negatively affected than others, or how these plastics are transported and where if anywhere they accumulate.

By monitoring the weather in Chalok and potentially in the future other locations around the island and progressively the world, and relating them to changes in water quality, we can potentially further understand certain effects of events such as storms, introduction of micro plastics and increasing atmospheric greenhouse gases and hopefully find a way to help ecosystems such as coral reefs cope with such devastating changes in the future. This information can be used globally in order to identify areas at most risk of these anthropogenic changes, but more positively, areas suitable for artificial reefs, coral restoration and clam and sea turtle head starting programs.

  • The weather station:


  • Some pictures of the breathtaking Chalok Bay... enjoy!


During the months of March, April and May small tornados can show up in the horizont
High tides are common during the first part of the year around Koh Tao when the sun is in the farthest point from the Earth
Raileigh dispersion happends when the sun is near the sunset, the sun rays needs to go across a thick atmosphere therefore changes in colours creating breathtaking sunsets
Extra Low tides happen at the beguining of summer when the sun is closest from the earth, this could be worse when the Monzoon starts in the mainlands, low preasures in Thailand move the water to the main coastline and it looks like the water is definitely gone!


Post written by: Jess Harding

visit our team:



Water Quality Elements Project

Water Quality Elements Project



With every drop of water you drink, every breath you take, you’re connected to the sea. No matter where on Earth you live”  Sylvia Earle

It is difficult to imagine the amount of water that makes up our oceans. Some studies speak of 1,332 million cubic kilometres; however, it is very difficult to know that for sure. What is certain is that the quality of this water has a direct influence on the life quality of its inhabitants.

Innoceana arrived at the coasts of the Gulf of Thailand with a clear idea. We wanted to understand the state of the ocean water by collecting water samples from the surrounding areas of the Island of Koh Tao and analysing them, as well as to try involving more people to continue to do so to create an initial database or "baseline" of the quality of this water. Today, five months later, we have got more than a hundred samples which have been collected from the main diving sites surrounding the island. The analysis of these samples has also allowed us to find two possible “dead zones”. What is more important is that the project has been expanded and today we work alongside different diving centres that have joined our cause. These centres are now buying their own sampling equipment and have begun to analyse the water quality with the purpose of contributing to the database managed by Innoceana and following the methodology that Innoceana created.

There are many parameters that can be measured in water and which are key to the survival of the wonderful living beings that ply the oceans. Temperature, pH, salinity, nitrates, phosphates and oxygen are just some of them. In this blog we are going to try to explain the reason for their importance:

Temperature: Seawater’s temperature (as it happens on land) varies from the equator to the poles where its minima is produced due to solar radiation which has a direct influence on its temperature. The current climate change is generating a dramatic increase in temperatures due to greenhouse gases and the destruction of the ozone layer.

Animal corals are ectothermic, thus leading to them being sensitive to temperature changes. Very low temperatures disable corals from making metabolic reactions necessary for them to survive, however, very high temperatures can also be a threat. When temperatures rise, the coral’s inner body becomes more acidic and toxic to the zooxanthellae, which commence to produce higher amounts of waste in the form of free radicals. The necessity to protect themselves from these free radicals, leave no other alternative to the animal coral but to eject the zooxanthellae in a process called coral bleaching. Bleached corals live only with 5 to 15% of their regular energy levels until environmental conditions return to normal levels and a new zooxanthellae moves into their bodies. However, corals do not often have enough energy to survive this period and die.

Hard corals survive in waters with temperatures ranging from 18 to 36oC, however they are healthiest in temperatures ranging between 22 to 28oC. In temperatures above 30oC, corals struggle to survive and begin to die gradually in most cases. Below 18oC, reef-building corals begin to decline rapidly.

All species of sea turtle are also affected by climate change. An increase in nesting temperature have an impact on sea turtles as they rely on the sand temperature in which the eggs are incubated to determine the gender of the hatchlings. Due to this, 99% of sea hatchlings are turning females resulting in lack of males which in turn affects reproductive rates.

PH: An increase in atmospheric carbon dioxide (CO2) concentrations had led to oceans becoming more acidic, thus, decreasing water pH concentrations from 8.2 to 8.1 units. Studies have shown that corals are more likely to be healthier in seawater with pH levels between 8.0 and 8.3 units, as lowered pH levels lead to reduced calcification rates thus, growth rates. Therefore, pH becomes an indicator of water acidity which can be measured in logarithmic scale bounded between 0 and 14, pH 1 as is the case of hydrochloric acid can kill a human being with a single sip.

Salinity: Corals need salt water in order to survive. They require salinity concentrations in water between 32 to 34ppm as they are highly susceptible to disease leading to rapid coral bleaching in lower salinities which is mainly caused by near river openings, continuous heavy rains, and poor or excessive drainage in coastal areas. Salinity is measured by density or by parts per trillion (ppt) which is usually around 1.023 kg / litre. Salinity also affects other organisms such as fish that use an internal host regulation system. Changes in the salinity not only affect sea life but also produce changes in marine currents.

Nutrients (Nitrates and Phosphates): Coral reefs thrive best in areas with low nutrient levels, also known as oligotrophic waters, due to the fact that nutrient rich waters encourage macro algae growth, which is one of the major threats to corals. Macro algae grow much faster than corals competing with them for space, shading and smothering them. High nutrient concentrations also favour the increase of coral predators such as Drupella snails (Drupella cornus) and Crown of Thorns starfish (Acanthaster planci). The major nutrients of concern are compounds of nitrogen and phosphorous such as nitrates (NO-3) and phosphates (PO4) which are present in soil and especially concentrated in human sewage.

When these nutrients reach the sea, a phenomenon called "algae bloom" consisting in an uncontrolled growth of algae occurs resulting in dead zones. To date, Innoceana has located two possible dead zones in the Island of Koh Tao.

O2: Oxygen is fundamental for all life organisms, however, unlike terrestrial species, most underwater creatures use gills to filter dissolved o2 in water. When dissolved o2 levels are too low, underwater breather species must migrate from these areas in order to survive. This is the case of the so-called dead zones. o2 levels below 2 parts per million (ppm) or mg / litre, make survival of most aquatic organisms impossible.

 Source –


Turbidity: Turbidity indicates levels of suspended particles in water which can be directly linked to sea currents, to the type of substrate (muddy substrates lead to high turbidity, thus, blocking the entrance of natural light), or to nutrient levels that promote microalgae formation and growth. In the Island of Koh Tao, it is common to see high turbidity levels after rainy days due to the silt and other particles that the rain drags into the sea. Turbidity can be measured vertically from a boat and horizontally underwater, both by using the Secci disk which is obtained as a result of the refraction and diffraction studied centuries ago by Snell. Areas with high turbidity may be unhealthy specially for corals but also areas with very low turbidity may be a symptom of dead zones.


Innoceana has designed a low-cost measuring kit (150 euros) which can be used to analyse water quality in a very simple way. In addition to this, we have also designed a system to help every diving centre that would like to participate in the collection of data (There are already 10 centres interested on the project and 3 centres have already bought their measuring kit). This system consists of the following:

  1. Cover Letter (pdf): Koh-Tao-WQA
  2. Protocols (pdf): KTWQ Elements Protocol V3
  3. Contract of commitment (pdf): WQEKT-SOU
  4. Measurement kit:

Water Quality Elements Project

Water Quality Elements in Project


"With every drop of water you drink, every breath you take, you're connected to the sea. No matter where on Earth you live"  Sylvia Earle

Es difícil de imaginar la cantidad de agua que hay en nuestros Océanos, algunos estudios hablan de 1.332 millones de kilometros cubicos, es muy difícil de saberlo a ciencia cierta, pero lo que es seguro es que la calidad de este agua tiene una influencia directa en la calidad de vida de sus moradores.

Innoceana llegó a las costas del Golfo de Tailandia con una idea clara, queríamos entender cual es la situación de las aguas que rodean la pequeña isla de Koh Tao e intentar influir a más personas para que siguieran haciéndolo de manera que pudieramos crear una base de datos inicial o "baseline" de la calidad de estas aguas. Hoy, cinco meses después contamos con mas de cien muestras que cubren los principales lugares de las aguas que rodean la isla y hemos sido capaces de testear las aguas de dos posibles "dead zones" o zonas muertas en el mar. Lo que es más importante, el proyecto ha conseguido expandirse y hoy contamos con distintos centros de buceo que estan comprando sus equipos de medición siguiendo el proceso que Innoceana ha creado y midiendo la calidad de las aguas contribuyendo a la base de datos que gestiona Innoceana.

Son muchos los parámetros que se pueden medir en el agua, no obstante algunos de ellos son realmente clave para la supervivencia de los maravillosos seres vivos que surcan sus aguas. Entre ellos están los siguientes e intentaremos explicaros por que son importantes:

Temperatura: la temperatura del mar (al igual que pasa en la tierra) varía desde el ecuador a los polos donde se producen sus mínimas, esto es debido a la radiación solar y esta temperatura atmosférica tiene influencia directa en la temperatura del agua de los mares. El cambió climático está generando un aumento considerable de las temperaturas a causa de los gases de efecto invernadero y la destrucción de la capa de ozono. Este aumento de temperatura en los mares tiene influencias tan dráticas como provocar coral bleaching (los corales a partir de 30 grados no pueden sobrevivir y mueren gradualmente) o en el caso de los reptiles provocar que solo nazca descendencia del mismo sexo ya que a partir de determinadas temperaturas el sexo es siempre femenino.

PH: el ph es un indicador de la acidez del agua y se mide en escala logarítmica acotada entre 0 y 14, un ph 1 como es el caso del ácido clorhídrico puede matar a un ser humano con un solo trago. PH mayores de 7 son básicos. Los océanos historicamente se han mantenido en ph 8,2 lo que da lugar a aguas básicas. Hoy en día ese número está disminuyendo progresivamente en gran medida a causa de los gases de efecto invernadero que el ser humano arroja a la atmósfera. Los Océanos se están acidificando y esto tiene consecuencias tan graves como disolver conchas y otros organismos calcáreos como los corales o directamente arrevatar la vida de muchos otros animales.

Salinidad: todos hemos tragado alguna vez agua de mar o se ha tumbado flotando sobre el mar, los mares deben esta salinidad a las sales minerales que los ríos arrastraron a los mares en las eras geológicas. La salinidad del mar se mide por densidad o por partes por trillón, la densidad se suele situar entorno a 1,023 kg/litro. La salinidad afecta a muchos organismos como a los peces que utilizan un sistema de hosmoregulación interno. Cambios en la salinidad de los océanos no solo afectan a sus organismos si no que también producen cambios en las corrientes marinas.

Nutrientes (Nitratos y Fosfatos): El fósforo y el nitrógeno son dos de los nutrientes esenciales para el crecimiento saludable de las plantas. Las algas y otros organismos como son los tunicados o las esponjas "Fouling organisms" necesitan nutrientes para crecer y su crecimiento es rapidísimo. En cambio los corales no necesitan de nutrientes para su correcto funcionamiento. Cuando distintos nutrientes llegan al mar, por ejemplo, un río arrastrando compuestos nitrogenados provenientes de cultivos y zonas agrícolas, este es el caso de los famosos fertilizantes. Cuando estos componentes llegan al mar se produce un fenómento denominado en inglés "algae bloom", se trata de un crecimiento descontrolado de algas que, si es muy significativo, las algas pueden acabar con el oxígeno del agua y producir las famosas zonas muertas o dead zones. Hasta la fecha en Koh Tao hemos descubierto dos posibles zonas muertas.

Zona muerta - Wikipedia

O2: el oxígeno es fundamental para los organismos marinos así como los terrestres, a diferencia de los terrestres, bajo el agua los organismos necesitan de branquias para filtrar el o2 disuelto en el agua del mar. Cuando el o2 es demasidado bajo los organismos tienen que escapar de esa zona para poder sobrevivir, como en el caso de las nombradas zonas muertas. Un nivel de o2 por debajo de 2 partes por millón o mg/litro, imposibilita la vida de la mayoría de los organismos acuáticos.

Fuente de la foto -


Turbidez: la turbidez es un índice de las partículas en suspensión que hay en el agua, esto viene muy relaccionado con las corrientes, con el substrato (suelos limosos generan malas visibilidades o alta turbidez), tambien los nutrientes del agua generan microalgas que afectan a estos parámetros. En Koh Tao es típico que despues de díás de lluvia la turbidez es alta debido a los limos y otras partículas que arrastra la lluvia al mar. La turbidez se puede medir en vertical desde barco o en horizontal en el agua usando el disco de Secci, arrojando resultados distintos a causa de la refracción y difracción estudiada hace siglos por Snell. Las zonas con alta turbidez puede ser poco saludables por ejemplo para los corales pero también zonas con muy baja turbidez pueden ser un síntoma de zonas muertas.



Innoceana ha diseñado un kit o equipo de medición de bajo coste (150 euros) mediante el cual se pueden tomar todos estos parámetros de manera sencilla, además del mencionado kit o equipo, también hemos diseñado un proceso para ayudar a los centros de buceo que quieran participar (tenemos 10 hasta la fecha que han mostrado interés y 3 ya están comprando equipos), las partes del proceso son las siguientes:

  1. Carta de Presentación en pdf : Koh-Tao-WQA
  2. Protocolos en pdf: KTWQ Elements Protocol
  3. Contrato de compromiso en pdf: WQEKT-SOU
  4.  Kit de medición: Link