Science – Page 56 – Southern Fried Science

New research lists tuna species as threatened; will fisheries managers act?

July 14, 2011July 14, 2011 David Shiffman 2 Comments

atlantic_bluefin_tuna_thunnus_thynnus_oceana_keith_ellenbogen_37339 — Image courtesy Keith Ellenbogen, OCEANA

Bluefin tuna have become a posterchild for the marine conservation movement. A single bluefin can sell for tens or even hundreds of thousands of dollars, which results in heavy fishing pressure. Conservationists and fisheries scientists have tried for years to get the fishing quota reduced. They tried to get CITES protection for the bluefin. Citing both heavy fishing pressure and the fact that the oil spill occurred in bluefin spawning grounds in the Gulf, some recently tried to get these animals protected under the Endangered Species Act. To date, these efforts have fallen short, resulting in just a modest quota reduction at ICCAT. New research, however, shows just how important protecting this group of fishes is.

Largetooth sawfish to become second elasmobranch to receive Endangered Species Act protections

July 13, 2011 David Shiffman 1 Comment

Conservation, Science

The Largetooth Sawfish (Pristis perotteti) is about to become the second elasmobranch protected by the Endangered Species Act, a welcome step in the conservation of these animals. In addition to the slow growth, low number of offspring, and relatively late maturity which characterizes most elasmobranchs, another biological feature contributes to sawfish being “among the most endangered fishes in the world,” according to Shark Advocates International President Sonja Fordham. It’s hard to imagine a biological structure that can get more thoroughly entangled in fishing nets than the “saw” on their rostrum, and bycatch is one of the leading causes of population decline in this group of animals. Additionally, the saw used to be a part of the souvenir trade.

Ocean Conservation, Ecology, Science, and Outreach on Dr. Kiki’s Science Hour

July 10, 2011July 10, 2011 Andrew Thaler

Conservation, Science

Check out my interview with Dr. Kiki Sanford on Dr. Kiki’s Science Hour. httpv://www.youtube.com/watch?v=Huf6ahIgShU And here’s a direct link for a high resolution version.

Rumors from the Abyss: visions of a future without deep sea conservation

July 6, 2011July 10, 2011 Andrew Thaler 3 Comments

Conservation, Science

sfs_26 — Bathymetric map, click for GEBCO high resolution image

The deep benthos is simultaneously the largest and least explored ecosystem on the planet. Covering nearly 60% of the Earth’s surface, it supports an almost unimaginable reservoir of biodiversity, rivaling all terrestrial habitats combined. Its microbial and metabolic diversity have revolutionized our view of how life is sustained, not once, but twice (first with the discovery of chemoautotrophic organisms at hydrothermal vents, and again with the discovery of cognate communities at methane cold-seeps). In spite of these major discoveries, the deep benthos is essentially invisible. Only a select few will ever witness it first hand, while for the rest, it will remain a dark and unfathomable abyss.

This places the deep benthos in a precarious position. Human activities that influence the deep sea go unnoticed. Without a thorough understanding of its ecology, it is impossible to assess the damage caused by anthropogenic impacts. Although recent and ongoing studies have shed light on many species and communities, the deep benthos remains largely unexplored. Two studies, both released this week, reveal simultaneously how little we know about the deep benthos and how human impacts, even unintentional ones, could shape this ecosystem.

Things you might like to know about Physical Oceanography – Tsunamis

July 5, 2011July 5, 2011 Andrew Thaler

Popular Culture, Science

This entertaining and informative video comes to us from physical oceanography graduate student Katie Smith. Hat Tip: Girls are Geeks

New Scaly-Foot Gastropod found in Indian Ocean

July 1, 2011July 4, 2011 Guest Writer 1 Comment

Science

Megumi Shimizu is a second year PhD student at the Duke University Marine Lab. Since the news has so far only been reported in Japanese, we asked her to provide a short write-up of the discovery. The first scaly-foot gastropod, Crysomallon squamiferum, was found in the Indian Ocean ten years ago (Van Dover et al 2001), … Read More “New Scaly-Foot Gastropod found in Indian Ocean” »

Shark Science Monday: The Sharks and Shark Fisheries of India

June 13, 2011October 27, 2013 Guest Writer 3 Comments

Science

Divya Karnad is a wildlife biologist in India focusing on marine issues. She began her career working with olive ridley sea turtles, studying hatchling responses to beach lighting and temperature-dependent sex determination. Lately, she has been focusing on marine fisheries issues on both coasts of India, including shark fishing and the fin trade. She met WhySharksMatter at the International Marine Conservation Congress, and agreed to write a guest post for Southern Fried Science.

A soupy end to Indian Sharks

Thomas and Arulsingh, fishermen who hail from Kanyakumari, hauled up their nets and fishing lines on a beach in southern India. The catch was special and I was privileged, as an outsider, to be invited to watch as this enormous fish was sliced, its fin, the most valuable part, handled with extreme care. The shark fin, I was told, would fetch a lot of money, despite the fact that it was not a hammerhead, which fetches the best price. Nevertheless, the fishermen revealed, there were several more where this one came from, and they could be caught easily using specialized hooks and lines. Altogether estimated to host about 70 species of shark, 18, including two species of hammerheads, spadenose, requiem and milk sharks, are often landed for fins or meat from Indian waters. Different parts of the Indian coast have different species compositions of sharks, with the northwest reporting large proportions of spadenose sharks, hammerheads along the south west coast, and requiem, hammerheads and milk sharks along the east coast. Sharks are usually brought to shore before finning and the flesh is consumed locally while the fins are exported to South-east Asian markets.

Were 18 foot long thresher sharks responsible for closing a New York beach?

June 3, 2011June 9, 2011 David Shiffman 10 Comments

Popular Culture, Science

Earlier this week, several New York state beaches were closed due to shark sightings. Fox News’ Rick Leventhal, speaking as part of Bill Hemmer’s “America’s Newsroom” show, reported on this story, claiming that “some onlookers ID’ed them as thresher sharks, they’re estimated to be about 18 feet long”. A half-eaten seal also washed up on shore nearby.

To his credit, Mr. Leventhal attempted to play down fears about these animals, saying that “Let’s not forget that sharks live in the ocean…as long as there’s food, they’re likely to keep hanging around”. However, I was immediately skeptical of the claim that a group of 18 foot long thresher sharks were swimming slowly just a few yards offshore. A cursory review of the known biology and ecology of thresher sharks will explain my skepticism.

Dear Fishermen, Please release mako sharks alive. Thanks, The Management

June 3, 2011May 31, 2011 David Shiffman 3 Comments

Conservation, Science

The world of fisheries management is so full of laws and regulations that it’s no wonder many fishermen feel persecuted by the government. That’s why I was pleasantly surprised to see the National Marine Fisheries Service trying something new.

International research team tracks threatened oceanic whitetip sharks

June 1, 2011May 31, 2011 David Shiffman

Conservation, Science

Oceanic whitetip sharks are considered by many to be a poster-child for shark conservation. Once one of the most abundant species of pelagic sharks on Earth, unregulated overfishing throughout their global range had led to a precipitous decline in their population. In some parts of their range, the species has declined in population by more than 70% in the last few decades. Scientists haven’t been able to find them in significant numbers for many years. One of the few remaining known aggregation sites is Cat Island in the Bahamas, and that’s where an international team of researchers just went to find these animals.