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Yellow-tail (Caesio cuning) is dominant fish caught by fisherman from Karimunjawa. It has been indicated as an overexploited stock; therefore, rules are required to manage the stocks for achieving sustainable fisheries. The purpose of the study was to describe fishing gear used by fisherman and evaluation status of yellow tail fish resources in a transition season (March-April 2018). The method used Length-Based Spawning Potential Ratio (LB-SPR) technique. Results showed that the status of yellow-tail fish on March-April 2018 (transition season) was underexploited with values of fishing mortality to natural maturity (F/M) is 1,44, Spawning Potential Ratio (SPR) is 0,50 and rate length proportional caught more significant than a length at first maturity (SL50>Lm) so an additional effort 10% is still possible. In the previous study on January-February 2017 (west season), the status of yellowtail fish was overexploited with values of fishing mortality to natural mortality (F/M) is 2,75, Spawning Potential Ratio was 0,18 and rate length proportional caught smaller than a length at first maturity (SL50<Lm). Therefore, sum of fishing trip must be regulated according to fishing season so that it can create sustainable fisheries.

STATUS SUMBERDAYA IKAN EKOR KUNING (Caesio cuning) PADA MUSIM PERALIHAN DI PERAIRAN KARIMUNJAWA: SUATU PENDEKATAN MENGGUNAKAN SPAWNING POTENTIAL RATIO