Pelagic fish larvae

Pelagic fish larvae

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Abstract

Larvae of several ocean pelagic fish species, such as tunas and marlins, have been known to have large jaws, but the ecological significance of this unique morphological character has been hardly analyzed in evolutionary ecology. Pelagic spawners produce small and nutrition-poor ova, and spawning and nursery grounds of the open ocean migratory fishes are oligotrophic. We hypothesize that cannibalism would be a possible life style in the larval period and the large mouth gape would be an adaptive morphological characteristic for a cannibal in the oligotrophic pelagic environment. We showed that mouth gape size of the open ocean pelagic fish is significantly larger than that of offshore/coastal pelagic fish in larval period. A mathematical model demonstrated that cannibalism would tend to evolve in high sea environment. Our findings suggest an evolutionary pattern of cannibalism trait in the larval stage of pelagic fishes.


The poster asked for info,

2003-07-12 18:44:45 by notwhatyou

Don't know. Here's an example of being helpful, not just giving a dumb answer. I merely went to Google and looked up Coalfish. Here's my friendly and helpful answer.
Identification:
Very similar to the Pollack, with it's three rounded dorsal fins and two anal fins. The lower jaw is approximately equal to the upper jaw, although it may extend marginally further in larger specimens. The chin barbel is minute or even absent in larger fish. The eyes are small in comparison to the overall head dimensions.The pale lateral line is straight, or only slightly curved. The back is a darkish olive green, to brownish green or blue, that contrasts with the silvery grey / white of the sides and belly


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