The gonad maturity level of Tor Fish (Tor spp.) in upstream Wampu Watershed Langkat Regency of North Sumatera

[摘要] The aim of this research is to observe the maturity level of gonad, the size of fish first-time ripe gonad, sex ratio and gonad maturity index of Tor Fish (Tor spp.) in Upstream Wampu Watershed. Sampling was conducted for three months, from July to September 2017. The development of gonad maturity was observed morphologically. GMI was analysed based on a comparison between gonad weight and body weight of Tor Fish (Tor spp.). The caught fish consists of two species: Gemo Fish (Tor soro) and Jurung Fish (Tor tambroides). The gonad maturity level of Tor soro male was obtained from levels I, II, III, and IV and Tor soro females obtained from levels I, II and IV. The gonad maturity level of Tor tambroides male was GML I, II and II and Tor tambroides female obtained GML I and II. GMI Tor soro males ranged from 0.01% - 4.66%, while GMI Tor soro female 0.04% -5.68%. GMI Tor tambroides male 0.05% -1.25%, while GMI Tor tambroides females ranged from 0.02% -0.88%.

[发布机构] Department of Aquatic Resources Management, Universitas Sumatera, Utara Medan; 20155, Indonesia^1;Ministry of Marine Affairs and Fisheries Indonesia Republic, Fish Quarantine and Inspection Agency of Medan II, Belawan, North Sumatera; 20252, Indonesia^2

[效力级别] 生态环境科学

[关键词] Body weight;Maturity indices;Maturity levels;Sex ratios