Growth Pattern, Gonadal Maturity, Condition Factor and Gill Net Selectivity of the Hard-Lipped Barb (Osteochilus hasselti CV) from Sungai Batang River, Indonesia | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 1, Volume 29, Issue 1, January and February 2025, Page 1-26 PDF (683.39 K) | ||||
| DOI: 10.21608/ejabf.2025.402690 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Ahmadi Ahmadi; Sara Ghanem
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| Abstract | ||||
| This study examined the growth pattern, condition factor (K), length at first capture (Lc50), length at first maturity (Lm50), gonadosomatic index (GSI), and selection factor (SF) of the hard-lipped barb (Osteochilus hasselti CV) in Sungai Batang River, Indonesia. Fish were weekly purchased from local fishermen over a two-month period (April-May 2024). A total of 355 specimens were studied, consisting of 204 males and 151 females, with total lengths ranging from 60 to 190mm and weights from 2 to 91g. The fish exhibited an isometric growth (b = 2.98–3.04) and were in good condition, with a sex ratio of 1.4:1. The length-weight relationship was strongly positive (r = 0.9575–0.9863). No significant differences were observed in total length (TL), body weight (W), or the mean W/TL ratio between the sexes. However, females had higher mean values for body depth (BD), BD/TL ratio, and K value compared to males. The Lc50 was greater than the Lm50, indicating a high likelihood of spawning. The Lc50 and SF values were 116.5mm and 3.65, respectively, suggesting that the use of a 1.25-inch mesh size gillnet is suitable for fishing practices. A follow-up collection of fish samples was conducted three months later (June-August 2024) to investigate the maturity stages of both sexes and determine their GSI. Macroscopic morphological characteristics revealed that testes could be classified into four stages: immature, mature, ripe/spawning, and spent. Female ovaries were classified into five stages: immature, mature, ripe, spawning, and spent. The GSI values for males ranged from 1% to 10.52%, while those for females ranged from 1% to 13.46%. The findings of this study provide a valuable baseline for evidence-based fisheries management. | ||||
| Keywords | ||||
| Length maturity; Maturity stages; Gear selectivity; Isometric; Selection factor; Hard-lipped barb | ||||
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