Decrypting the life history characteristics and stock dynamics of Parapenaeopsis stylifera (Milne-Edwards,1837) in the north-western Bay of Bengal: A confluence of approaches for better decision support

Gyanaranjan Dash; Swatipriyanka Sen; Rajesh Kumar  Pradhan; Rajan Kumar; Rekha Devi Chakraborty; A. P. Dineshbabu; Shubhadeep Ghosh

doi:10.21077/ijf.2025.72.3.155588-02

Authors

Gyanaranjan Dash RC of CMFRI, Visakhapatnam
Swatipriyanka Sen ICAR-CMFRI
Rajesh Kumar Pradhan ICAR-CMFRI
Rajan Kumar ICAR-CMFRI
Rekha Devi Chakraborty ICAR-CMFRI
A. P. Dineshbabu ICAR-CMFRI
Shubhadeep Ghosh ICAR-CMFRI

https://doi.org/10.21077/ijf.2025.72.3.155588-02

Keywords:

life history parameters, data-poor method, dynamic pool model, TropFishR

Abstract

The life history of Kiddi shrimp (Parapenaeopsis stylifera) was assessed using lengthbased data from the commercial trawlers operated along the Digha waters (West Bengal, India). Growth parameters were estimated as L∞= 14.26 cm, K = 1.77 yr-1, t0= -0.001 yr, tmax = 1.5 yr, and φ = 2.56. Mortality rates were M = 3.00 yr⁻¹, F = 4.11 yr⁻¹, Z = 7.11 yr⁻¹, with an exploitation rate (E) of 0.58. The species matures early (Lm50 ≈ 8.15 cm, 0.48 yr) and attains peak biomass (Lopt ≈ 8.0 cm, 0.47 yr). A high M/K ratio (1.7) indicates r-selected traits-fast growth, high mortality, and peak yield at high fishing mortality. Cohort biomass declines rapidly to 1% within 0.65 yr, yet the short generation time allows reproduction under current exploitation. Stock status from the Bayesian Schaefer Model using catch-based data (2007-2021) showed current biomass (B/B msy = 1.15) is 15% whereas the effort (F/F msy = 0.85) is 15% lower than required level for MSY. Kobe plot also indicating a high probability (57.9%) that the stock is in the healthy and sustainable green zone. Thompson and Bell analysis suggested fishing mortality could increase by 8%, raising yield marginally by 1.6% to 2442 t and revenue by 1.3% to ₹423 million, while maintaining safe spawning biomass (SSB/SSB0 =30%). However, due to its short generation time and recruitment sensitivity, P. stylifera requires adaptive harvest control rules with annual or biannual assessments to ensure longterm sustainability.

Keywords: BSM, Data-poor method, Dynamic pool model, Life history parameters, TropFishR

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Author Biography

Gyanaranjan Dash, RC of CMFRI, Visakhapatnam

Scientist, Crustacean Fisheries Division

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