Temporal patterns in cephalopod catches and application of non-equilibrium production model to the cephalopod fishery of Karnataka

摘要

Non-equilibnum production models were htted to cephalopod catch and effort statistics to arrive at limit reference points (LRP), Y_MSY and.fMSY. The parameter estimates, K (carrying capacity), r (intrinsic rate of population growth) and q (catchability coefficient) were 93,677 t, 0.403 per year, 8.614E-08 for Schaefer model. Estimated precautionary limit Y_MSY, was 9,446 t and the corresponding f-WSY was 24,94,611 h. Despite the fact that the 2007 catches are currently around the Y_MSY, the current effort, f_now 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, f_0.1 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 Y_MSY levels in the present fishing area.