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Goatfish is one of the most dominant demersal-fish species currently caught by local fishermen in North-Coast of East Java and Madura using modified Danish-Seine. This research aimed to investigate species diversity goatfish and spawning potential ratio (SPR) of most representative species, U. suphureus. Identification was completed through morphometric and meristic investigation. A total of 2,550 fish were sub-sampled from catches for lengthfrequency analysis, length at first maturity (Lm), length-weight relationship and SPR. The results showed that there were five species within catches, being: U. sulphureus, U. moluccensis, U. tragula, U. sundaicus, and P. heptacanthus. Length-weight followed cubic formula with Wt = 0.0159 * Lt (p< 0.05; r = 0.92). Female length-at-first mature was reached at 11.67 cm Fork-Length, with total female biomass in the sample 6.5 kg. Total biomass was 93.1 kg, hence the SPR was < 7%. The minimum value of SPR while maintaining stock at good parent stock was >20%. From these results, it was very clear that demersal fishery in North-Coast of East Java, represented by U. sulphureus is unsustainable. Management measure, either size or effort limitation should be implemented, otherwise, the stock will soon collapse.

Spawning potential ratio (SPR) of Sulphur Goatfish (Upeneus sulphureus): biological basis for demersal fishery management in Java Sea