Một số đặc điểm sinh trưởng và sinh sản của nhum sọ Tripneustes Gratilla (Linnaeus, 1758) ở vùng biển Lý Sơn, Tỉnh Quảng Ngãi

Abstract

     Research on growth-reproductive characteristics as a basis for solutions to rational use and sustainable development resource of the Tripneustes gratilla (Linnaeus, 1758) in Ly Son waters, Quang Ngai Province. Collected the samples monthly from August 2019 to July 2020. The analysis results showed that the body diameter (L) ranges from 29.30-102.28 mm, average 65.30 ± 15.75 mm; body height (H) 20.00 - 58.38mm, average 39.22 ± 28.72mm; body weight (W) 15,61 - 254,60g, average 73.40 ± 47.53g. Length - weight relationship of Striped sea urchin W = 0.003*L^2.3845 with the value of regression coefficient R² = 0.78 and W = 0 .0056*H^2,545, R² = 0.75. Male-female ratio 1.00:1.38. Their spawning season occurred all year round, the main season from August to next year April (average GSI ranges from 5.49 - 10.63), highest in January 2020 with GSI = 10.63 ± 2.73. The size at first sexual maturity 63.39 mm L, the mean fecundity estimated 38.13×10⁶ ± 1.96×10⁶ eggs. The current results provide the scientific basis for sustainable management of fishing and natural resource of Tripneustes gratilla (Linnaeus, 1758) in this waters.