Scholarlink

<p>Size selectivity of hooks used in artisanal trolling lines were examined for two commercially important species, <i>Scomberomorus commerson</i> and <i>Thunnus albacares</i>, in the Gulf of Mannar region (GoM). Catch data were collected at fortnightly intervals between September 2024 and August 2025 from trolling lines fitted with three ‘J’ hook sizes (#5, #6, and #7). Selectivity parameters were estimated using eight distinct models - normal location, normal scale, log-normal, gamma, logistic, Richards, binormal, and bilognormal of the Share Each Length’s Catch Total (SELECT) methodology. Bilognormal and normal scale models showed the best fit to the length frequency data of <i>S. commerson</i> and <i>T. albacares</i> respectively. The mean lengths of <i>S. commerson</i> were estimated to be 67.2&#xa0;cm, 80.5&#xa0;cm and 99.7&#xa0;cm for hook #7, #6 and #5, respectively, while, the mean lengths of <i>T. albacares</i> were estimated to be 99.2&#xa0;cm, 118.8&#xa0;cm, and 147.2&#xa0;cm for hook #7, #6 and #5, respectively. The results indicated that hooks #7 and #6 captured individuals lower than length at first maturity. Based on these findings, the study recommends the use of hook sizes that are above hook #6 for responsible exploitation of <i>S. commerson</i> and <i>T. albacares</i> in the GoM region. This strategy minimizes the capture of juvenile fish, promotes sustainable fishing practices, and supports marine conservation, while also contributing to species-specific fishery management in the GoM.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Hook Selectivity Dynamics of Two Key Pelagic Species in Trolling Line Fishery of Gulf of Mannar, Southeast Coast of India

  • 期刊论文

  • 发表日期：

    2026年1月31日

查看全文
  • Nallamuthu Gopalakrishnan,
  • Thangaraji Ravikumar,
  • Neethirajan Neethiselvan,
  • Esakkimuthu Dineshkumar,
  • Rajarajan Tamilselvan,
  • Thavasiyandi Umamaheswari,
  • Soosaiantony Emiema,
  • Sangaralingam Mariappan,
  • Ulaganathan Arisekar

摘要

Size selectivity of hooks used in artisanal trolling lines were examined for two commercially important species, Scomberomorus commerson and Thunnus albacares, in the Gulf of Mannar region (GoM). Catch data were collected at fortnightly intervals between September 2024 and August 2025 from trolling lines fitted with three ‘J’ hook sizes (#5, #6, and #7). Selectivity parameters were estimated using eight distinct models - normal location, normal scale, log-normal, gamma, logistic, Richards, binormal, and bilognormal of the Share Each Length’s Catch Total (SELECT) methodology. Bilognormal and normal scale models showed the best fit to the length frequency data of S. commerson and T. albacares respectively. The mean lengths of S. commerson were estimated to be 67.2 cm, 80.5 cm and 99.7 cm for hook #7, #6 and #5, respectively, while, the mean lengths of T. albacares were estimated to be 99.2 cm, 118.8 cm, and 147.2 cm for hook #7, #6 and #5, respectively. The results indicated that hooks #7 and #6 captured individuals lower than length at first maturity. Based on these findings, the study recommends the use of hook sizes that are above hook #6 for responsible exploitation of S. commerson and T. albacares in the GoM region. This strategy minimizes the capture of juvenile fish, promotes sustainable fishing practices, and supports marine conservation, while also contributing to species-specific fishery management in the GoM.