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Abstract. Sardinella lemuru (Bali sardinella) is a species of the Clupeidae family that is mainly caught in the waters of the Bali Strait. S. lemuru is usually processed into canned products, boiled salted sardine, and fish meal. The high demand for S. lemuru promotes intensive fishing efforts and has been affected by a decline of the stock of S. lemuru resources. This research aimed to study the length-weight relationships of the fish body, and the food habits of S. lemuru caught in Bali Strait water and landed at Pengambengan fishing port, Bali. This study is expected as scientific input for sustainable use and management of S. lemuru. The research was conducted from April to July 2022. The average size of the fish caught was between 18.15 and 19.6 cm, and was categorized as of adult size. The result showed that S. lemuru has a negative allometric growth pattern, which means the fish length grows relatively faster than the weight. Several groups of taxa were found in the fish's stomach, i.e., phytoplankton from taxa of Bacillariophyceae, Dinophycea, and Cyanophyceae classes, and likewise zooplankton from the Bivalvia, Ostracoda, Oligotrichea, Branchiopoda, Copepods, Crustacea sub-phylum, and rotifers subclasses. There were variations of the food habits and types of food of S. lemuru based on fish size and fishing ground.
Key Words: growth pattern, fish size, food habit variations, zooplankton.
Introduction. Bali sardinella, Sardinella lemuru, is a small pelagic fish species with a high economic value from the Clupeidae family. This fish is mainly caught around the waters of the northern part of Bali Strait and southern part of Bali and it belongs to the species of S. lemuru Bleeker 1853 (Kartika et al 2017; Wujdi et al 2013). S. lemuru is caught using four types of fishing gears: purse seine, gill net, lift net, and traditional seine net. Purse seine has the highest Catch per Unit Effort (CPUE) value compared to the other fishing gears (Anindyas et al 2017). In 2007 it contributed 89%, and in 2016 to 71% of the total catch. The gross tonnage purse seiner ranges from 10-30 GT, with a net length ±338 m and 30 m depth. Meanwhile, a boat measures 5-10 GT, with a net length of ±56 m and a depth...