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<p>The present study was conducted along the southeast coast of Tamil Nadu between 2022 and 2023, focusing on the species <i>Metapenaeopsis andamanensis</i>. The catch per unit effort (CPUE) was estimated at 0.517, with a maximum sustainable yield (MSY) of 62,832&#xa0;kg and a Fmsy value of 23,056&#xa0;kg. Diet composition analysis revealed that the predominant food item was left digestive material (31%), followed by detritus (29%) and copepods (20%). The observed size range was 4.0–13.5&#xa0;cm for females and 4.0–11.5&#xa0;cm for males. The overall sex ratio (male to female) was recorded as 1:1.3. Peak spawning activity occurred during March–April and October–November. The size at first maturity was 5.5&#xa0;cm for males and 6.5&#xa0;cm for females. The gonadosomatic index (GSI) for females ranged from 0.62 to 3.82. The species exhibited a relative fecundity ranging from 41,426 to 112,531 eggs per female. Growth parameters estimated using the von Bertalanffy growth function included an asymptotic length (L∞) of 19.21&#xa0;cm, a growth coefficient (K) of 0.392 per year, and a theoretical age at zero length (t₀) of -0.46 years. The growth performance index (<sup>ϕ</sup>) was calculated as 2.46, with an M/K ratio of 1.15 and an L₅₀/L ∞ ratio of 0.473. Mortality estimates included a total mortality (Z) of 3.57, natural mortality (M) of 2.26, and fishing mortality (F) of 1.31, resulting in an exploitation rate (E) of 0.36. The length at which 50% of the population was vulnerable to capture was 8.95&#xa0;cm. Recruitment analysis indicated a peak in April, accounting for 16.05% of total recruitment. Based on the current findings, <i>M. andamanensis</i> is presently underexploited at the studied sampling stations, suggesting the potential for increased fishing pressure within sustainable limits.</p>

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Fishery, Biology, and Dynamics of the Metapenaeopsis andamanensis (Wood-Mason, 1891) from the Southeast Coast of Tamil Nadu

  • 期刊论文

  • 发表日期：

    2025年5月3日

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  • Hari Prasad Mohale,
  • P. Jawahar,
  • N. Jayakumar,
  • K. Karuppasamy,
  • Swapnil Ananda Narsale,
  • Rishikesh Venkatrao Kadam,
  • Shrinath Vaijanath Gavhane

摘要

The present study was conducted along the southeast coast of Tamil Nadu between 2022 and 2023, focusing on the species Metapenaeopsis andamanensis. The catch per unit effort (CPUE) was estimated at 0.517, with a maximum sustainable yield (MSY) of 62,832 kg and a Fmsy value of 23,056 kg. Diet composition analysis revealed that the predominant food item was left digestive material (31%), followed by detritus (29%) and copepods (20%). The observed size range was 4.0–13.5 cm for females and 4.0–11.5 cm for males. The overall sex ratio (male to female) was recorded as 1:1.3. Peak spawning activity occurred during March–April and October–November. The size at first maturity was 5.5 cm for males and 6.5 cm for females. The gonadosomatic index (GSI) for females ranged from 0.62 to 3.82. The species exhibited a relative fecundity ranging from 41,426 to 112,531 eggs per female. Growth parameters estimated using the von Bertalanffy growth function included an asymptotic length (L∞) of 19.21 cm, a growth coefficient (K) of 0.392 per year, and a theoretical age at zero length (t₀) of -0.46 years. The growth performance index (ϕ) was calculated as 2.46, with an M/K ratio of 1.15 and an L₅₀/L ∞ ratio of 0.473. Mortality estimates included a total mortality (Z) of 3.57, natural mortality (M) of 2.26, and fishing mortality (F) of 1.31, resulting in an exploitation rate (E) of 0.36. The length at which 50% of the population was vulnerable to capture was 8.95 cm. Recruitment analysis indicated a peak in April, accounting for 16.05% of total recruitment. Based on the current findings, M. andamanensis is presently underexploited at the studied sampling stations, suggesting the potential for increased fishing pressure within sustainable limits.