Life History and Length Based-Spawning Potential Ratio (LB-SPR) of Exploited Demersal Fish Stock (Upeneus sp) in Sunda Strait.

Abstract

Length Based-Spawning potential ratio (LB-SPR) is the most popular technique in worldwide that use for data-poor fisheries management. Based on this situation, LB-SPR tries to apply in demersal fish is Kuniran (Upeneus sp) in small scale fisheries search in Sunda Strait to learn about the sustainability potency both of maturity and recruitment potency from spawning potency ratio. Length data was collected by team research from 2014 to 2019 (except 2017, there is no sampling activity), which from Bogor University. Research result show that asymptotic length (L8)is 302,10 mm, natural mortality (M) 0,49, Bartalanffy growth (k) 1,03. The length at 50% maturity size (Lm50) is 134,80 mm, length at 95% mature size (Lm95) is 147 mm and relatively higher than the selectivity size. The spawning potential ratio found at 1-6% with the annual average is 2% per year. The conclusion is this research shown that recruitment potency and recovery of depleted stock relatively low and potential un-sustain. The life history and LB-SPR information need to formulate a new strategy to manage size selectivity and fishing intensity in the Sunda Strait.