Sardinella lemuru resources are abundant, nutritious, high omega-3 and have high economic value in artisanal fisheries. Its production volume landed for over a decade, but the most significant increase was peak southeast monsoon 2019 at Canggu fishing ground. However, prior-conventional kinship assessments genetically need to be confirmed. These research objectives encompass both molecular identification and genetic relationship of Canggu S. lemuru with the others. Similar morphological samples had collected of ten individuals. Chelex 10% was used for genomic DNA extraction, CRK-CRE primer with Hotstart-50 PCR thermal profile had applied for amplification. 1% agarose electrophoresis and Sanger sequencing had examined for both quantity and quality of D-loop amplicon. Identification using the algorithm of BLASTn. Phylogenetic tree analysis uses the neighbor-joining method. The genetic identity of 10 D-loop Canggu samples was high (97.46%-98.47%) as Philippines S. lemuru (MK579633.1-MK579742.1). The phylogenetic significantly shows low barrier inter-waters from low to moderate genetic distance. Inter-waters samples are very close in intraclade, but it still has a different mutation rate in another clade. Means suggested that Canggu S. lemuru is more diverse in nucleotide base substitutions encouraging high variation. These study results provide needed information that southern translocation occurred among waters, its dispersal connection.
Prigi Waters, East Java, is known as a fishing ground for mackerel tuna and other tunas. However, at the end of 2019, it was found that Bali Sardine (Sardinella lemuru) was a dominant caught that reach more than 56% of the total catch. The reason for the high fish abundance in 2019 is still unknown. Therefore, this study aims to understand the relationship between S. lemuru catch and plankton abundance in Prigi Waters during the high catch event and comparing a similar study in 2017. Plankton abundance was analyzed using the APHA method. Pearson correlation analysis was used to express the relationship between S. lemuru catch and plankton abundance. The result showed that the composition of zooplankton and phytoplankton in waters was 52.8:47.2. Class Bacillariophyceae dominated the phytoplankton group in Prigi waters (47%), where Actinocyclus is the most common genus found (28,762 cell/m3). While in the zooplankton group, the class Maxillopoda dominated (75%), where Nauplius is the most common genus found (34,876 ind./m3). The Pearson correlation analysis showed that S. lemuru catch in November 2019 was greatly influenced by phytoplankton (61.32%) than zooplankton (21.38%) abundances, and the rest was influenced by other factors. High and low plankton abundance in 2019 and 2017 has implications to high and low catch of S.lemuru, respectively. It is suggested that routine and continuous monitoring of plankton may provide good information for fisheries prediction and management in Prigi Waters.
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