Biology and fishery of cephalopods (mollusca: cephalopoda) along the Malabar coast

Asokan, P K (2000) Biology and fishery of cephalopods (mollusca: cephalopoda) along the Malabar coast. PhD thesis, University of Calicut, Kerala.

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Abstract

Cephalopoda - the octopuses, squids and cuttlefishes - comprise one of the most significant components of marine life. All are large, fast-growing, and active predators with highly evolved and specialized qualities of great inherent interest. There are approximately 650 recognized species of cephalopods alive today and more than 10,000 fossil forms. Cephalopod translates literally into "head footed" which explains why squid, as well as the nautilus, cuttle.fish and octopus among others, with their arms and tentacles attached directly to their heads, is so named. Cephalopods are found in all of the world's oceans, from the warm water of the tropics to the near freezing water at the poles. They are found from the wave swept intertidal region to the dark, cold abyss. All species are marine, and with a few exceptions which tolerate brackish water. Large populations of cephalopods are found in all the world's oceans from the surface to the deep sea. They are major food resources for many top predators such as whales, dolphins, seals, birds and large fish. Worldwide, between 1990 and 1997, cephalopod landings increased steadily from 2.4 million tonnes to 3.3 million tonnes. Japan accounted for 20010 of the world cephalopod landings in 1997 (Globefish, 1997). Squids are by far the main cephalopod species caught in the world representing 73% of the cephalopod world catches. During 1997, the world total squid landings were 2.4 million tonnes. Squids represent a major fishery resource widely distributed throughout the oceans of the world. Of the several hundred species harvested around the world, only the Indian squid (Loligo duvauceli) has been of major commercial importance to the Malabar area. This species is common throughout the East and West Coast of India The needle squid (Doryteuthis sibogae) also occurs, but only in very low abundance. The other squid is the big fin squid Sepioteuthis lessoniana found in the Palk Bay area where a fishery exists.

Item Type:Thesis (PhD)
Supervisor(s):Abdurahiman, U C
Uncontrolled Keywords:Biology and fishery; cephalopods; Malabar coast
Subjects:Molluscan Fisheries
Theses
Fish and Fisheries > Fish biology
Fish and Fisheries
Molluscan Fisheries > Cephalopods
Divisions:CMFRI-Cochin > Marine Capture > Molluscan Fisheries
ID Code:7111
Deposited By:Geetha P Mrs
Deposited On:27 Jan 2011 14:02
Last Modified:20 Jan 2014 12:39

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