Oceans fish extinction

Warmer Water Threatens Fish Globally
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A new study finds five deep-sea creatures are in critical danger of being fished into extinction.

Researchers examined surveys of roundnose grenadier, onion-eye grenadier, blue hake, spiny eel, and spinytail skate in the northwest Atlantic Ocean.

Both the onion-eye grenadier and blue hake have been commercially fished, and all five are taken accidentally by fishers going after other catch.

99.6 percent decline

Declines over a 17-year period through 1994 were steep for all five fish, ranging from 87 to 98 percent. Data through 2003 for the roundnose and onion-eye grenadiers showed declines over the 26-year period for these two species were 99.6 percent and 93.3 percent, respectively.

The researchers estimate that in three generations, the decimation of all five species will reach 99 to 100 percent. According to the World Conservation Union's (IUCN) criteria, these species qualify as critically endangered.

The data were obtained from the Canadian Department of Fisheries and Oceans.

The study shows how quickly overfishing can affect deep-sea species, as none of these fish were fished in any substantial number before the 1970's.

No fast rebound

Deep-sea species are particularly vulnerable to overfishing. They can live for 60 years and not reach sexual maturity until their teens, so these dramatic declines have occurred within a single generation. Recovery is not swift, since deep-sea fish typically produce few offspring.

The decline of one species can affect the rest of the ocean.

"Species declines change predator-prey dynamics, energy flow through systems, and ecosystem resilience, stability, function, and form, " study author Jennifer Devine of Memorial University told LiveScience.

The species have also shrunk in size over the same period. Each normally grows to more than 3 feet in length. But all of the species except for the spinytail skate declined in mean length by 25 to 57 percent over this period.

This is the first study of its kind to focus on deep-sea fish. Previous research has shown that overfishing has lead to declines in oceanic cod, sharks, rays, tuna, marlins, swordfish, sea turtles, and several species of shellfish.


Extinction of ocean fish: a growing threat. (Marine Matters).: An article from: Endangered Species Update
Book (University of Michigan, School of Natural Resources)

Fish extinction helped evolution

2010-05-17 21:11:33 by fallwitch

Humans may owe their place on the planet to a mass extinction of fish 360 million years ago, it has been claimed.
The cataclysmic event reset the evolutionary starting point for all vertebrates living today and If it had not occurred, humans and their ancestors may not have evolved - or could have evolved very differently, US scientists said.
Key features shared by all modern mammals, birds and reptiles, - such as five-digit limbs - originated when life re-emerged after the mass extinction, the experts believe.
"Everything was hit, the extinction was global," said researcher Lauren Sallan from the University of Chicago


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