Growth parameters and population dynamics of deep-sea caridean shrimp Plesionika semilaevis (Spence Bate, 1888) along the south-west coast of India

Chakraborty, Rekha D and Sreelakshmy, S and Sunil, K T S and Sreesanth, L and Ragesh, N (2025) Growth parameters and population dynamics of deep-sea caridean shrimp Plesionika semilaevis (Spence Bate, 1888) along the south-west coast of India. Indian Journal of Fisheries, 72 (3). pp. 35-44. ISSN 0970-6011

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Abstract

The deep-sea caridean shrimp Plesionika semilaevis (Spence Bate, 1888) is a significant commercial species in the deep-sea fishery on the south-west coast of India. Analysis of its population parameters is crucial for understanding variability and ensuring the sustainability of this stock. This study presents the first stock assessment of P. semilaevis from Indian waters, analysing its population and growth parameters in the south-eastern Arabian Sea. Both sexes showed negative allometric growth. Growth estimates using the von Bertalanffy model revealed fast growth and low longevity for males (L∞ = 14 cm TL, K = 0.74 yr-1 and Φ′ = 2.16) and females (L∞ = 14.3 cm TL, K = 0.73 yr-1 and Φ′ = 2.17). The length at first capture was estimated as 9.46 cm while the length at maturity was measured at 8.73 cm. The estimated values for natural, fishing and total mortality were 1.12 , 2.06 and 3.18±0.17 yr-1 respectively. The exploitation rate (E = 0.65) was almost equal to the Emsy value (E0.1 = 0.62), indicating the fishery as sustainable. The findings provide a baseline for stock management and conservation of Indian deep-sea fisheries

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