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Life History Assessments of Fishery Resources as Applied in Biodiversity Valuation and Conservation In: ICAR Sponsored Winter School on Recent Advances in Fishery Biology Techniques for Biodiversity Evaluation and Conservation, 1-21 December 2018, Kochi.

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Relation http://eprints.cmfri.org.in/13331/
 
Title Life History Assessments of Fishery Resources as
Applied in Biodiversity Valuation and Conservation In: ICAR Sponsored Winter School on Recent Advances in Fishery Biology Techniques for Biodiversity Evaluation and Conservation, 1-21 December 2018, Kochi.
 
Creator Ganga, U
 
Subject Conservation
Marine Biodiversity
Pelagic Fisheries
 
Description In fisheries biology, life history parameters of fishes are routinely assessed as they can be employed
to understand the dynamics of the resource and aid in fisheries management. Species inhabiting
different environments will have the life history characteristics suitable for that particular ecosystem.
In this, the principle of natural selection operates which ensures that maximum number of fittest
individuals survive and flourish in that particular ecosystem. The relation between habitat, ecological
strategies and population parameters give rise to an organism classified as either an r strategist or
K strategist (Adams, 1979). The theory of r and K selection is based on two important assumptions.
Firstly, the fitness of the offspring is positively related on the resources invested on it and secondly,
there is only a fixed and limited amount of resources available. The best reproductive strategy is
therefore a compromise between these two conflicting demands and determines the species position
on the r-k continuum. The r- k continuum is a model and the r or k selection of any species is not in
an absolute sense but only on a relative basis with reference to other species, and useful for
comparison in an ecological context. Fisheries based on more r selected species will be more
productive and can be fished at younger ages and higher levels of fishing mortality than k selected
species. Also, provided there is a minimum population size and a spawning stock, their chances of
recovery from overfishing are higher. Fisheries based on more K selected species will have a high
maximum yield per recruit but fewer fish.
 
Date 2018
 
Type Teaching Resource
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/13331/1/29-Winter%20School%20on%20Recent%20Advances%20in%20Fishery%20Biology%20Techniques%20for%20Biodiversity%20Evaluation%20and%20Conservation_2018_Ganga%20U.pdf
Ganga, U (2018) Life History Assessments of Fishery Resources as Applied in Biodiversity Valuation and Conservation In: ICAR Sponsored Winter School on Recent Advances in Fishery Biology Techniques for Biodiversity Evaluation and Conservation, 1-21 December 2018, Kochi. [Teaching Resource]