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Eastern Little Tuna (Euthynnus afinnis). Increased production of eastern little tuna will certainly have a good impact on economic activities and fishermen's income, but on the other hand it will have an effect on these fish resources. According
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Eastern little tuna production still depends on stocks from nature, so it is feared that if production continues to increase it will threaten the sustainability of tuna resources, therefore for the sake of sustainable management information is needed on population parameters so that research is carried out from January to April 2021 with the aim of...
Context in source publication
Context 1
... Island fishery production is dominated by capture fisheries with fishing activities generally within 1-3 nautical miles by local fishermen and catches are dominated by Decapterus spp, Euthynnus afinis, Rastrelliger sp, Selaroides spand other small pelagic fish species. Eastern little tuna (Figure 1), is an economically important type of fish with a high utilization rate from nature through quite intensive fishing activities using purse seine and gill net fishing gear, where the production of Eastern little tuna tends to increase every year. Increased production of eastern little tuna will certainly have a good impact on economic activities and fishermen's income, but on the other hand it will have an effect on these fish resources. ...
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Citations
... Estimated FLs at ages 1, 2, and 3 were about 390 mm, 450 mm, and 510 mm, respectively. Previous reports on the growth of kawakawa in other areas (Hasibuan et al., 2022;Lelono and Bintoro, 2019;Motlagh et al., 2010;Mudumala et al., 2018;Tangke et al., 2021) show considerable variation among regions (Table 3). Estimated FLs in our study are very similar to those reported off the coast of northern Sumatera (Hasibuan et al., 2022) but are larger than those reported in the Persian Gulf and Sea of Oman (Motlagh et al., 2010), around Ternate Island (Tangke et al., 2021), and off the south coast of East Java (Lelono and Bintoro, 2019), and smaller than those reported off the west coast of India (Mudumala et al., 2018). ...
... Previous reports on the growth of kawakawa in other areas (Hasibuan et al., 2022;Lelono and Bintoro, 2019;Motlagh et al., 2010;Mudumala et al., 2018;Tangke et al., 2021) show considerable variation among regions (Table 3). Estimated FLs in our study are very similar to those reported off the coast of northern Sumatera (Hasibuan et al., 2022) but are larger than those reported in the Persian Gulf and Sea of Oman (Motlagh et al., 2010), around Ternate Island (Tangke et al., 2021), and off the south coast of East Java (Lelono and Bintoro, 2019), and smaller than those reported off the west coast of India (Mudumala et al., 2018). These variations in growth rate might reflect the influence of environmental factors such as temperature and nutrients. ...
Fringescale sardinella is one of the largest fishery resources and has the highest economic value in the Savu Sea. The increasing demand for this fish makes it one of the main fishing targets, which allows overfishing to occur. Therefore, the purpose of this study was to determine the population dynamics of sardinella fringescale through growth and mortality, recruitment and exploitation rate of fringescale sardinella in Rote Island in the Savu Sea.
A total of 1095 fish sampled from Rote Island were assessed and showed the total length (TL) range from 90 mm to 157 mm. Further, the data were analyzed using FISAT II software with the following results: the length-weight relationship was W= 0.0004L 2.2523 , while the negative allometric growth pattern and growth equation was Lt = 165.26 (1 - exp 1,500 (t + 0.0585) ).
The age of S. fimbriata consisted of 1-2 cohorts. Recruitment of S. fimbriata in Rote Island occurred throughout the year with the highest peaks in May and August. The size of the first caught fish (Lc) was 96.98 mm TL. The total mortality rate (Z) was 2.41 yr ⁻¹ , natural mortality (M) was 1.45 yr ⁻¹ and fishing mortality (F) was 0.97 yr ⁻¹ . The exploitation rate of S. fimbriata is estimated at 0.40 yr ⁻¹ ; this implies that the stock does not exceed the optimum exploitation rate (E = 0.5) or that overfishing has not occurred in the Savu Sea. Nevertheless, this study’s results are sufficiently robust to anticipate that the unprecedented overexploitation of S. fimbriata in Rote Island has nearly occurred. Therefore, regular monitoring and surveillance of surface gillnet fishing gear are urgently needed.
