Indicator Parameters Population for The Management of Threadfin Bream (Nemipterus Spp.) In The Inshore Java Sea, Indonesia

Abstract

This study was to assess parameters indicators of population of threadfin bream, to see how appropriate management strategies, the utilization of inshore Threadfin bream in shore Java Sea. Research was conducted during the ten months from January to October 2015. The study was conducted in PPI Kronjo, Banten. Threadfin bream analyzed from catches of three different types of trip: daily, ? 1 week, and ? 2 week. Analysis conducted by population parameters include: the growth parameters, gonad maturity level, the size of the first captured and mature gonads, spawning potential ratio. The result of this research showed the proportion of immature condition threadfin bream with highest on daily trip, 86% in ? 1-week trip, and 73% in ? 2 week trip exploitation rate E <0.5 at the daily trip, and E> 0.5 on a trip ? 1 weeks, and ? 2 weeks. Rated K on a daily trip (0.60 / year), ? 1 week (0.44 / year) and ? 2 weeks (0.37 / year). Spawning potential ratio could be only analyzed on trip ? 1 week (SPR 13%), and ? 2 weeks (SPR 12%). Threadfin bream catches were dominated by juvenile threadfin bream which known Lc <Lm. The highest risk was juvenile threadfin bream caught in coastal areas, with K high recovery could be conducted on these fishing areas.

Threadfin bream SPR value is above 10%. In order to increase the SPR level until 20%, recommendation which should be implemented is minimum size of catches about 165.20 to 171.00 mm.