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|Title:||Temporal patterns in cephalopod catches and application of non-equilibrium production model to the cephalopod fishery of Karnataka|
Mohamed, K. Sunil
Limit Reference Points
Non-Equilibrium Production Models.
|Abstract:||Non-equilibrium production models were fitted to cephalopod catch and effort statistics to arrive at limit reference points (LRP), <i>Y<sub>MSY</sub></i> and <i>f<sub>MSY</sub></i>. The parameter estimates, <i>K (carrying capacity), r (intrinsic rate of population growth) </i>and <i>q (catchability coefficient)</i> were 93,677 t, 0.403 per year, 8.614E-08 for Schaefer model. Estimated precautionary limit <i>Y<sub>MSY</sub></i><sub>,</sub> was 9,446 t and the corresponding <i>f<sub>MSY</sub></i> was 24,94,611 h. Despite the fact that the 2007 catches are currently around the <i>Y<sub>MSY</sub></i>, the current effort, <i>f<sub>now</sub></i> expended in the trawling ground is 29,32,214 h for a trawling period of 97.4 h per multi-day fleet (MDF) trip. Fishing effort is 28% in excess of the precautionary target, <i>f<sub>0.1</sub></i> estimated at 21,07,060 h as well as 20% above the LRP for sustaining the fishery at MSY levels. It is recommended that trawling effort for the MDF be reduced so that the long-term catches of cephalopods correspond to the <i>Y<sub>MSY</sub></i> levels in the present fishing area.|
|ISSN:||0975-1033 (Online); 0379-5136 (Print)|
|Appears in Collections:||IJMS Vol.41(2) [April 2012]|
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