Yield Per Recruit Of Goatfish, Upeneus spp. In Terengganu Waters, Peninsular Malaysia
By Priyanto Rahardjo, Mohammad Zaki M. Said, Mohammad Azmi Ambak, and Siti Nuraini
Two species of goatfish, Upeneus sulphureus and U. Bensasi play a significant role in the demersal trawl fishery in Terengganu Waters, Peninsular Malaysia. The studied of yield per recruit was carried out in this area. The fish sample were collected using experimental trawling in the Terengganu waters. The sampling in this area was performed for 12 months from March 1995 to February 1996.
The estimate of the level exploitation rate (E01) for U. Sulphureus was 0.557 and optimal yield per recruit corresponded to a value of relative sixe at first capture (c) = 0.40. Reducing exploitation rate from the current level of 0.616 to a value closer E01 will reduce yield per recruit by 4.37%
The estimate of the level exploitation rate (E01) for U. bensasi was 0.670 and optimal yield per recruit corresponded to a value of c = 0.50. Increasing exploitation rate from the current level of 0.551 to a value closer E01 would increase yield per recruit by 8.71%
It seems that U. sulphureus and U. bensasi have similiar response to the change in c and E. For example, if E was increased while c at the same level, yield per recruit would increase for both species. Additionally, by reducing c and keeping E at same level, increased yield per recruit would result for both species.
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