Exploitation and Catch Fluctuation of Small Pelagic Fishes in Prigi Waters, South Coast of Java

Abstract

Studies on the exploitation and catch fluctuations of pelagic fishes have been undertaken in order to understand the fishery systems, annual and seasonal change of fishing effort and catches, as well as species composition. The study was based on the daily monitoring data of the purse seiners. The results showed that generally the fishing activities is one day fishing, the increase of fishing effort reflected in the number of fishing units and the number of trip, while the trend of production and catch rate were fluctuated by either annual or seasonal; the peak of catch rate was occurred in 2007, 2008 and 2012 periods, during December to June were low catches, and are going in the peak season in September-October. The lowest catch rate is about 100kg/trip and the maximum of 4.3 tons/trip (the average of 1.3 tons/trip), however the fail of fishing was often occurs and reached 30% of the total number of trips; the failed fishing was decline from year to year. The catch rate (kg/trip/day) was showed a pattern fluctuations; the small pelagic fish mainly the scads (Decapterus spp.) and clupeids (Bali sardine, Sardinella lemuru), respectively 33% and17%, whereas the dominan large pelagic fish is 'tongkol'/frigate tuna (Auxis thazzard). The changes of species domination was occurred either in annually or seasonally

Length-based population parameters of shortfin scad (Decapterus macrosoma) in Bali Strait waters, Indonesia

“…D. macrosoma is recorded as one of the most abundant fishes in Bali Strait [7]. This fish was also reported as the main catch from purse seine in some waters in Indonesia, such as Sibolga waters [13], South China Sea [27], Kendari waters [28], Java Sea [29,30], Prigi waters [31], and Watampone waters [32]. In the South China Sea, D. macrosoma was already classified as highly exploited [33], while it was overexploited in the Java Sea [34].…”

Characteristic and evaluation of sustainability artisanal bonito (Auxis spp.) fisheries in the Prigi Bay and surrounding waters

“…Data collection was conducted during field surveys as the case study at the Archipelagic Fishing Port of Prigi, Trenggalek Regency, East Java Province, from September to December 2020 (Fig 1). The fishing port has been chosen as one of the main landing bases for small pelagic fishes with high productivities in East Java [15][16]. Fishing activities were carried out on a one-day trip.…”

ASPEK BIOLOGI IKAN TEMBANG (Sardinella gibbosa BLEEKER, 1849) DI PERAIRAN PRIGI DAN SEKITARNYA

“…Jenis ikan ini juga berperan penting secara ekologis sebagai mangsa ikan pelagis besar (Kasim et al, 2014). Berbeda dengan ikan lemuru yang telah beberapa kali diteliti di perairan Prigi (Suwarso & Wujdi, 2015;Suwarso et al, 2014), sampai saat ini belum ditemukan adanya penelitian spesifik tentang ikan tembang di perairan Prigi dan sekitarnya.…”

“…Pada perairan Prigi dan sekitarnya, ikan tembang merupakan sumber daya ikan yang penting. Berdasarkan penelitian tentang eksploitasi dan fluktuasi hasil tangkapan ikan pelagis kecil (Suwarso et al, 2014), diketahui bahwa jenis ikan pelagis kecil yang paling banyak tertangkap di Prigi adalah ikan layang (Decapterus spp.) dan lemuru.…”