Archive for the ‘Sharks & Rays’ Category

Sri Lanka scales up its domestic campaign to protect sharks with a global push

September 8, 2019

https://news.mongabay.com/2019/09/sri-lanka-scales-up-its-domestic-campaign-to-protect-sharks-with-a-global-pushpublished on MongayBay on 05.09.2019

  • With the killing of sharks and rays on the rise, Sri Lanka played a lead role in pushing three proposals to extend global protection to 18 species at the recently concluded CITES wildlife trade summit in Geneva.
  • Sixty-three sharks and 42 ray species are found in Sri Lankan waters, and are threatened by overexploitation driven by an ever-increasing demand for sharks fins, meat, and liver oil.
  • While five species of sharks currently enjoy legal protection against the species trade in Sri Lanka, conservationists see an urgent need to extend protection to all reef sharks and other endangered shark and ray species.

Decades ago along the beaches of Sri Lanka, fish sellers used bicycles to transport their catch, including sharks. It was said the sharks were often so big that, when tied down to the bicycle frame, their snouts and tail fins would touch the ground at either end.

“But not anymore,” says Hiran Jayawardene, the founder chairman of the National Aquatic Resources Research and Development Agency (NARA). He says this decline is evident at shark landing sites around the country, where fishermen are no longer pulling in the large sharks they did before.

Sri Lanka’s waters are home to 63 shark and 42 ray species, but many are threatened by overexploitation to feed the growing demand for shark fins, meat, and liver oil.

The result of the voting at the CITES summit in Geneva in favor of the uplisting of mako sharks to Appendix II. Image courtesy of IISD Reporting Service.

But the country is looking to change that, rolling out a raft of regulations in the past two decades to protect various shark species domestically, and, more recently, spearheading a push for the global protection of highly exploited and endangered mako sharks.

Among the many proposals it supported at last month’s global summit of the Convention on International Trade in Endangered Species (CITES), Sri Lanka took a leading role in calling for the inclusion of the two species of mako sharks, shortfin (Isurus oxyrinchus) and longfin (I. paucus), in CITES Appendix II, which would subject their trade to strict rules. It also called for similar protections for six species of giant guitarfishes and 10 species of wedgefishes.

The IUCN Red List includes both species of mako sharks as endangered, all six species of giant guitarfishes as critically endangered, and nine of the 10 species of wedgefishes as critically endangered.

“All these species have seen very steep declines in their populations in recent decades and this is mostly due to overfishing, habitat destruction and degradation,” Rima Jabado, the IUCN Shark Specialist Group’s regional vice-chair for the Indian Ocean, told Mongabay.

Kim Friedman, senior fisheries resources officer at the U.N.’s Food and Agriculture Organization (FAO), said a mere listing would not protect the species. “It matters to change the management framework of fisheries to get implemented at ground level.”

More than 100 million sharks are killed every year, mainly for their fins. Image by Malaka Rodrigo.

Protecting the ocean’s predators

In Sri Lanka, five species of sharks enjoy legal protection: the pelagic thresher shark (Alopias pelagicus), bigeye thresher (A. superciliosus), common thresher (A. vulpinus), oceanic whitetip shark (Carcharhinus longimanus), and whale shark (Rhincodon typus). Since 2001, local fishing regulations have required that any of these sharks that are caught must be brought to shore with their fins attached. The rule was enforced to curb shark finning, the practice of catching a shark, cutting off its fins mid-ocean, then dumping the live shark back into the water, where, unable to swim, it dies.

In 2013, Sri Lanka went further and introduced a five-year National Plan of Action for the Conservation and Management of Sharks (NPOA), specifying measures for adoption and implementation of new shark conservation and management mechanisms.

Sisira Haputhantri, an ocean fisheries expert at NARA, told Mongabay that the shark action plan, since extended for another five years, should help monitor the implementation of the conservation initiatives.

Over the past 10 years, the country has official exported 59 metric tons of shark fins annually. But there’s evidence that greater volumes of shark fins are being smuggled out of the island.

There are recorded and unrecorded instances of fins being exported as dried fish, said Sevvandi Jayakody, Sri Lanka’s coordinator for the recent CITES summit.

By listing mako sharks in Appendix II, scientists can gather accurate figures of sharks killed as part of the international trade, which would help determine whether catches are reaching what’s known as the maximum sustainable yield (MSY), Jayakody said.

“We do not want to stop shark fishery but we do want sustainable fishery. CITES should help educate regulators and fisherfolk alike, on the new developments,” she said.

Both species of mako are oceanic, roam the high seas, and undertake long-distance migrations, making local protection mechanisms of somewhat limited value, according to Rex I. de Silva, author of Sharks of Sri Lanka. The CITES listing is therefore vital to protect the species in international seas.

A shark is finned at the Negombo shark landing site in western Sri Lanka. Image by Malaka Rodrigo.

John E. Scanlon, former secretary-general of CITES, told Mongabay that the convention had been used effectively since 2013 to regulate the international trade in commercially harvested sharks and rays. These include hammerheads (family Sphyrnidae), porbeagles (Lamna nasus) and oceanic whitetip sharks and manta rays, as well as silky (Carcharhinus falciformis) and thresher sharks together with devil rays (genus Mobula) since 2016. Mako sharks are the latest to join the list.

“Following the 2003 listing of sharks, there had been great progress in the conservation of white sharks, basking sharks and whale sharks,” Jabado said. “The other listings are much more recent, and it is unlikely we will see a difference in the population size of these species just yet.”

Conservation management

What countries need is better fisheries management to curb overexploitation, Jabado said.

“Many species in the Indian Ocean are considered migratory but many are endemic to this region,” she said. “This means, we need higher levels of species protection. To ensure protection of the migratory species, the best strategy is collaboration with other countries in the region, both on research and conservation.”

Daniel Fernando of Blue Resources Trust initiated a nine-day survey of fish markets and landing sites at 11 localities in Sri Lanka that led to the identification of 34 shark species. Five of them are sharks new to science. “If a short survey of nine days could help discover new species, it shows the need for greater research on Sri Lanka’s sharks,” Fernando told Mongabay.

Following the listing of sharks and rays to Appendix II during the 2013 CITES summit in Bangkok, Sri Lanka’s Department of Fisheries Resources and the FAO conducted a joint survey to identify the successes and challenges experienced in the implementation of CITES provisions.

The survey showed poor awareness about the CITES process among stakeholders. However, they had a satisfactory level of knowledge of other measures, with more than 69 percent of respondents having awareness of management measures.

Sharks caught for their fins. Finning often takes place at sea, with the live shark thrown back into the water, where it’s unable to swim and quickly dies. Image by Malaka Rodrigo.

“Shark conservation in Sri Lanka appears to be at the starting point: It has a long way to go in order to reach conservation efforts undertaken by neighbours such as the Maldives,” said  Howard Martenstyn, a marine biologist with the Centre of Research for Indian Ocean Marine Mammals (CRIOMM).

Promotion of ecotourism of sharks and manta rays as an alternative to fishing can offer a different revenue model for the local economy, Martenstyn said.

 

Banner image of a stuffed shark toy at the Sri Lankan delegation’s seat at last month’s CITES summit in Geneva. Sri Lanka played a leading role in pushing for greater protection for sharks and rays at the summit. Image courtesy of IISD Reporting Service.

Shark spotted in Menik Ganga

May 19, 2016

This article was published on 16.02.2016 on SundayTimes – http://www.sundaytimes.lk/160214/news/extinct-shark-spotted-in-menik-ganga-182906.html

Shark-in-Menik-Ganga-23.01A few months ago, the apex predator of the freshwater riverine habitats, the crocodile, was reported in the sea off Wellawatte; recently the apex predator of the ocean, the shark, was reported in a river. The latest sighting of a shark in a freshwater habitat was reported by a group of wildlife lovers who visited Yala on January 23.

While travelling to their campsite in the evening they passed a bridge over the Menik Ganga that flows across Yala. The slow-flowing water in this part of the river is shallow and one of the group members spotted a large fish.

“That is a shark!” shouted Isuru de Soyza, pointing it out to the others before it swam away. Senehas Karunaratne, armed with a camera, had only a split of second to click before the shark took refuge under the bridge.

“The shark was about three feet long and quick in the water,” commented Mr. Karunaratne.

Rumours of sightings of sharks in the Menik Ganga have been around for a while and Mr. de Soyza claimed to have seen one in the same section of the river a few months ago.

Photographic evidence of sharks in the Menik Ganga first came from a team from the Wildlife Conservation Society of Galle (WCSG). While conducting an islandwide freshwater fish survey at the Menik Ganga about 7km upstream from the coast they spotted a shark in shallow, crystal-clear water about three feet deep.

They netted the shark and carefully brought it out of the water to take measurements. The shark was about three feet long. After photographing it, they released it back into the water.

The WCSG survey team had three more sightings of sharks in the Menik Ganga and the Kumbukkan Oya, closer to Kumana.
Sri Lanka’s foremost expert on sharks, Rex I. de Silva, was sent the WCSG photo for examination and identified the shark as a variant of the Pondicherry shark (Carcharhinus hermiodon).

This species lives in the Indo-Pacific region from the Gulf of Oman to New Guinea, with most records from the coastal waters of India. The International IUCN Red List of threatened fauna lists the Pondicherry shark as “Critically endangered – possibly extinct”.

The Red List states that the shark was last recorded in 1979. Rex de Silva, however, states that the shark has been recorded in small numbers in Sri Lankan seas since the mid-1980s with the species’ presence in Sri Lankan waters first documented by himself in 1988.

Commenting on these sightings on the “Sharks of Sri Lanka” Facebook page, Mr. De Silva said it was important to differentiate between a shark in freshwater from a shark in a river.

“In times of drought, when river levels, fall seawater may intrude some distance up rivers at high and especially spring tides. Sharks and other marine species may follow the seawater intrusion for a considerable distance up river, so although they are in a river they will still be in salty or semi-saline water.

When the salt water recedes the marine species follow it back to the sea. A shark in freshwater, on the other hand, is usually present farther up a river beyond the reach of salt water. As mentioned above, the shark photographed by the Wildlife Conservation Society of Galle to date remains the only record of a shark from freshwater in Sri Lanka.”

Mr. de Silva states that anecdotal evidence over at least 30 years suggests that there are sharks in the Menik Ganga, but these sharks were not identified although speculation about their identity was sometimes offered.

Literature indicates that Pondicherry sharks do not grow much longer than about 3.3 feet and hence are not a threat to humans.

Sharks are not blood-thirsty man-eaters as Hollywood movies depict, so the presence of sharks in the Menik Ganga simply adds an interesting element to Sri Lanka’s biodiversity and is nothing about which to feel panic.

A fisherman in Hikkaduwa caught a 12-foot, 350kg shark, reports last week said.

The shark was caught in deep ocean about 20 km from shore. Inspecting footage of the specimen, shark expert Rex De Silva provisionally identified it as a bull shark (Carcharhinus leucas).

Pondichery Shark in Menik Ganga (c) Wildlife Conservation Society of Galle

Pondichery Shark in Menik Ganga (c) Wildlife Conservation Society of Galle

Help for identifying a sharkAltogether, 61 species of shark have been found around Sri Lanka, however there could be more varieties living in our waters. Shark expert Rex de Silva maintains a Facebook group called “Sharks of Sri Lanka” and welcomes public sharing of images for identification purposes.

When forwarding images for identification it is best that a full lateral view (side view) is submitted as correct identification often depends on the relative positions of the fins, size and position of gill slits etc.

“I appreciate that obtaining a lateral view will not always be possible in which case any image is better than none and I am pleased to note the great interest in our sharks among lay persons,” Mr. De Silva states.

Mr. De Silva also launched a comprehensive book on sharks last year, with illustrations by prominent wildlife artist Jayantha Jinasena. Copies could be purchased from the Field Ornithology Group of Sri Lanka (FOGSL), Department of Zoology, University of Colombo (call 2592609 or email fogsl1976@gmail.com

 

Lanka among world’s top 20 shark killers

August 12, 2013

An international study has placed Sri Lanka among top 20 countries that catch sharks.

Noting that these 20 countries account for 80% of the world’s annual shark catch, a report based on the study puts the survival of many shark varieties in their hands.

Shark fins laid out to dry in Negombo

This report titled “The future of the Shark: A Review of Action and Inaction” was produced by the wildlife trade monitoring network TRAFFIC, and the Pew Environment Group. It analysed shark, ray and skate catch data provided by countries to the Food and Agriculture Organisation (FAO).

TRAFFIC’s Global Marine Programme Leader Glenn Sant said, “Countries need to take action to stop the decline in shark populations and help ensure that the list of species threatened by overfishing does not continue to grow.”

Placing Sri Lanka in the 14th place, the report says Indonesia, India, Spain and Taiwan account for more than 35% of the total shark catch. Though Sri Lanka’s contribution to the global catch is only 2.4%, it is still a significant quantity, given the size of the country and its fishing fleet.

Sharks are particularly vulnerable to overexploitation because of their biological characteristics of maturing late, having few young and being long-lived. Worldwide, shark populations are in decline due to unregulated fishing, much of it to meet the high demand for fins.

About 60 species of sharks populate in Sri Lanka’s waters and its exclusive economic zone. According National Aquatic Resources Research and Development Agency (NARA) fish expert Rekha Maldeniya, silky shark leads Sri Lanka’s shark catch. About 70% of the catch consists of silky shark, followed by thresher shark and hammerhead sharks.

Thresher shark, identified as a threatened species, was caught despite a government ban.

Oceanic white-tip shark, blue shark and mackerel shark are the other common species with commercial value, according to the Fisheries Department.

SharkGraphicThe Convention on International Trade of Endangered Species (CITES) held in Bangkok, Thailand in March this year declared the oceanic white-tip shark, three species of hammerhead sharks and manta rays as protected species. Accordingly, trade of these species requires a CITES permit. As a signatory to the convention, Sri Lanka will also need to take measures to regulate fishing of these species.
In Sri Lanka, the sharks are mostly a by-catch, says Dr. Maldeniya. But there are dozens of fishing boats particularly targeting sharks for fins which have a big export market. The long-line fishing method — that has several hooks attached to a line — is being widely used for shark fishing.

The Sri Lankan section of the report says that sharks are also caught as by-catch in bottom-set gillnet fishing, the bottom-set long-line fishing and the beach seine fishing.

Dr. Maldeniya says Sri Lanka has started a National Plan of Action for sharks. This has been initiated with assistance from the Bay of Bengal Large Marine Ecosystem (BOBLME) Project. The project aims at identifying shark species, their composition, possible breeding grounds and other factors which are relevant to shark conservation.

The NARA expert says the project also recommends policies to protect not only sharks but also the livelihoods of fishermen.

Sharks play a crucial role in sustaining the ocean environment. Where shark populations are healthy, marine life thrives; but where they have been overfished, ecosystems fall out of balance.

Published on SundayTimes on 04.08.2013 http://www.sundaytimes.lk/130804/news/lanka-among-worlds-top-20-shark-killers-55833.html

Hammerheads sharks caught at Negombo -  Malaka Rodrigo

Hammerheads sharks caught at Negombo (c) Malaka Rodrigo