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<p>Spot (<i>Leiostomus xanthurus</i>) is a species in the family Sciaenidae that occurs in the western Atlantic and Gulf of Mexico. Abundance and life history of spot in the Gulf of Mexico have been poorly documented in comparison with the Atlantic component of its distribution. Therefore, we used 38&#xa0;years (1986–2023) of fishery-independent data collected with bag seines, gill nets, and bay and offshore trawls to assess the long-term trends in abundance and length of spot and assess juvenile growth on the Texas coast. The abundance of spot increased along the Texas coast as indicated by positive trends observed in annual trawl and gill net catch-per-unit effort (CPUE). Mean annual total length (TL in mm) of spot also increased over the 38-year time series in each sampling gear. Spot in Texas begin to recruit into fishery-independent bag seines and trawls in January at approximately 22&#xa0;mm TL and grow at a rate of 10.6&#xa0;mm TL/month (0.35&#xa0;mm TL/day) to approximately 138&#xa0;mm TL by December. Analysis of monthly growth of juvenile spot through the time series suggests that growth rates have increased in more recent years, and year was a significant predictor that accounted for 34% of the variation in annual growth. Increasing catch, size, and growth rates could all be driven by the decline of commercial shrimp trawling in Texas coupled with a warmer climate in the Gulf of Mexico.</p>

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Abundance, seasonality, and growth of spot (Leiostomus xanthurus) in the Western Gulf of Mexico

  • 期刊论文

  • 发表日期：

    2025年1月28日

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  • Damon Williford,
  • Joel Anderson

摘要

Spot (Leiostomus xanthurus) is a species in the family Sciaenidae that occurs in the western Atlantic and Gulf of Mexico. Abundance and life history of spot in the Gulf of Mexico have been poorly documented in comparison with the Atlantic component of its distribution. Therefore, we used 38 years (1986–2023) of fishery-independent data collected with bag seines, gill nets, and bay and offshore trawls to assess the long-term trends in abundance and length of spot and assess juvenile growth on the Texas coast. The abundance of spot increased along the Texas coast as indicated by positive trends observed in annual trawl and gill net catch-per-unit effort (CPUE). Mean annual total length (TL in mm) of spot also increased over the 38-year time series in each sampling gear. Spot in Texas begin to recruit into fishery-independent bag seines and trawls in January at approximately 22 mm TL and grow at a rate of 10.6 mm TL/month (0.35 mm TL/day) to approximately 138 mm TL by December. Analysis of monthly growth of juvenile spot through the time series suggests that growth rates have increased in more recent years, and year was a significant predictor that accounted for 34% of the variation in annual growth. Increasing catch, size, and growth rates could all be driven by the decline of commercial shrimp trawling in Texas coupled with a warmer climate in the Gulf of Mexico.