Perikanan tuna dengan alat tangkap tonda, longline dan payang juga turut menangkap bycatch tuna. Bycatch tuna yang sering tertangkap adalah baby tuna, lemadang dan ikan cakalang yang dalam jangka panjang dapat menyebabkan resiko dan kerentanan. Penelitian ini secara khusus bertujuan untuk menentukan tingkat resiko kerentanan dengan pendekatan analsisi produktivitas dan suseptabilitas. Penelitian ini dilakukan pada bulan Juli 2013 di Pelabuhanratu. Analisis kerentanan dengan data produkitivitas dan suseptabilitas menggunakan software PSA NOAA. Tingkat kerentanan menunukan hasil yang relatif sama yaitu ikan cakalang (Katsuwonus pelamis) 1,14, ikan lemadang (Coryphaena hippurus) 1,38, baby tuna (Thunnus albacores) 1,41. Secara keseluruhan nilai menunjukan tingkat resiko rendah dan kerentanan ikan bycatch tuna masih berpotensi berkelanjutan.
The Minister of Marine Affairs and Fisheries Regulation number 26/2014 has decreed that the distance between FADs should not be less than 10 nautical miles and should not be installed to make a fence effect. Highly dense FADs that are deployed with not enough distance between them in a certain period will change the movement pattern of tuna. This study aims to obtain information on the actual data of FADs deployed in the southern waters of East Java, to estimate the deployment area and to provide a recommendation on the ideal number of FADs deployed in these waters. The FAD deployment area has been estimated to be 219,792 km2 or 21,979,200 ha. Based on this estimation, it is calculated that the ideal number of FADs installed in these waters is 814 units. Estimates of the optimal number of tuna fishing units are carried out using linear goal programming (LGP) which suggests 380 units of sekoci (fishing vessel) as the optimal unit number that can operate annually at the Fishing Port of Pondokdadap, Malang Regency. The number of sekoci currently operating at this port is 644 units.
Pemanfaatan ikan tuna begitu intensif sehingga potensial menyebabkan kerentanan. Namun dalam perikanan multi spesies, kelompok non target (retain) sering tertangkap dalam jumlah lebih besar sehingga turut berpengaruh pada tingkat kerentanyan. Penelitian yang dilakukan selama 2013 di Bali, Jakarta dan Pelabuhan ratu bertujuan melihat potensi kerentanan tersebut dari alat tangkap longline. Pendekatan analisis PSA (producitivity dan susceptabilitas) dilakukan pada jenis ikan retain tuna yaitu ikan tenggiri, cakalang (Katsuwonus pelamis), bawal dan Ikan lemadang (Coryphaena hippurus). Tingkat kerentanan kelompok retain alat longline secara keseluruhan masih rendah dari 1,8 dan dan ikan masih berpotensi berkelanjutan
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