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Reproductive biology and seed production of the tropical abalone Haliotis varia Linnaeus (Gastropoda)

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Relation http://eprints.cmfri.org.in/7123/
 
Title Reproductive biology and seed production of the
tropical abalone Haliotis varia Linnaeus (Gastropoda)
 
Creator Najmudeen, T M
 
Subject Molluscan Fisheries
Theses
Gastropods
 
Description The vast expanse of ocean has often been seen as a limitless source of
animal protein for mankind. As this source is depleting in recent years due to more
intense fishing pressure, maritime countries have given priority to aquaculture
development with the objective of preserving and increasing their natural resources.
The expansion of culture industry of any species chiefly relies on an improved
understanding of the biology of the species, particularly on spawning characters.
Dependence on the natural seed resources for culture is risky because it is extremely
variable in quality and quantity and off-season availability. So artificial seed
production is the only alternative for the expansion of aquaculture especially when the
distribution of the species is limited. Diligent work by fishery scientists in many parts of
the world is bringing the reproductive process and seed production of more organisms
under control.
Molluscs are one of the most compact groups of animals with more species
known from marine environments than of any other animal phylum. In number of
species, the mollusca are the second phylum to the Arthropoda, comprising about
80000 species. A major part of the world marine aquaculture production is made up of
molluscs including clams, cockles, oysters, mussels, scallops and abalones. In
aquaculture production, molluscs are the third largest commodity in the Asia-Pacific
region providing about 16% of the total. Three quarters of molluscs are gastropods
with about 1650 genera. Gastropods are among the most conspicuous sea animals,
and species of limpets, snails and slugs are found in all the marine habitats. Members
of this class have one shell, as opposed to clams and oysters with two. The most
valuable gastropod from an epicurean point of view is certainly the abalone.
Abalones, commonly kno':Vn as ear shell, are economically important
marine gastropods belonging to the genus Haliotis. There are about 100 species of
abalones in the world. They are found in both the hemispheres, but the larger
varieties exist in the temperate regions, while the smaller ones live in tropical and
arctic regions. Because these animals have been of commercial value since ancient
times much has been written about their natural history beginning with Aristotle
(Croits, 1929). The first fisheries of abalone were in China and Japan over 1500
years ago, but it is only in the last 30 years that the fisheries for abalone have
burgeoned worldwide and become economically important in many countries.
 
Date 2000
 
Type Thesis
NonPeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/7123/1/TH-90_Naj.pdf
Najmudeen, T M (2000) Reproductive biology and seed production of the tropical abalone Haliotis varia Linnaeus (Gastropoda). ["eprint_fieldopt_thesis_type_phd" not defined] thesis, Central Institute of Fisheries Education, Versova.