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Series 2 MDS180.Pdf CHARACTERIZATION OF COMMERCIAL SHRIMP TRAWL BYCATCH IN TEXAS DURING SPRING AND FALL COMMERCIAL BAY-SHRIMP SEASONS: 1993-1995 Billy E. Fuls, Tom Wagner, and Lawrence W. McEachron MANAGEMENT DATA SERIES No. 180 2002 Texas Parks and Wildlife Coastal Fisheries Division 4200 Smith School Road Austin, TX 78744 LIST OF TABLES Table 1. Total number of commercial bycatch samples collected by bay system during the spring (15 May-15 July) and fall (15 August-15 December) 1993-1995 commercial bay-shrimp seasons. Table 2. Mean ratios and standard error (SE) by number (no.) and weight (g) of commercial shrimp trawl bycatch to shrimp, finfish bycatch to shrimp, and other invertebrates to shrimp, for commercial bycatch samples collected by bay system during the spring (1 5 May- 15 July) and fall (1 5 August- 15 December) 1993- 1995 commercial bay-shrimp seasons. Table 3. Mean catch rate + 1 SE in number (noM9.8 m trawl) and weight (m9.8 m trawl), and mean size 2 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Sabine Lake during the 1994 spring commercial bay-shrimp season (1 5 May- 15 July). Table 4. Mean catch rate + 1 SE in number (no.Ml6.5 m trawl) and weight (m16.5 m trawl), and mean size 5 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Sabine Lake during the 1994 fall commercial bay-shrimp season (1 5 August-1 5 December). Table 5. Mean catch rate + 1 SE in number (no./h/9.8 m trawl) and weight (gM9.8 m trawl), and mean size & 1 SE (TL rnrn), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Galveston Bay during the 1995 spring commercial bay-shrimp season (1 5 May-1 5 July). Table 6. Mean catch rate 2 1 SE in number (no.Ml6.5 m trawl) and weight (g/h/16.5 m trawl), and mean size 2 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Galveston Bay during the 1995 fall commercial bay-shrimp season (1 5 August- 15 December). Table 7. Mean catch rate 2 1 SE in number (no.M9.8 m trawl) and weight (g/h19.8 m trawl), and mean size 2 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Matagorda Bay during the 1994 spring commercial bay-shrimp season (I 5 May-1 5 July). Table 8. Mean catch rate + 1 SE in number (no.Ml6.5 m trawl) and weight (gM16.5 m trawl), and mean size 2 1 SE (TL rnrn), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Matagorda Bay during the 1994 fall commercial bay-shrimp season (1 5 August-1 5 December). Table 9. Mean catch rate + 1 SE in number (no.kd9.8 m trawl) and weight (g/h/9.8 m trawl), and mean size 5 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Matagorda Bay during the 1995 spring commercial bay-shrimp season (1 5 May-1 5 July). Table 10. Mean catch rate + 1 SE in number (no.Ad16.5 m trawl) and weight (gM16.5 m trawl), and mean size 5 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Matagorda Bay during the 1995 fall commercial bay-shrimp season (1 5 August- 15 December). Table 11. Mean catch rate 2 1 SE in number (no.Ad9.8 m trawl) and weight (W9.8 m trawl), and mean size 2 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within San Antonio Bay during the 1994 spring commercial bay-shrimp season (1 5 May-1 5 July). Table 12. Mean catch rate 2 1 SE in number (no.Ml6.5 m trawl) and weight (g/h/16.5 m trawl), and mean size 2 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within San Antonio Bay during the 1994 fall commercial bay-shnmp season (1 5 August- 15 December). Table 13. Mean catch rate 2 1 SE in number (no.Ad9.8 m trawl) and weight (gW9.8 m trawl), and mean size 2 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within San Antonio ~a~ during the 1995 spring commercial bay-shnmp season (1 5 May- 15 July). Table 14. Mean catch rate 2 1 SE in number (no.Ml6.5 m trawl) and weight (g/h/l6.5 m trawl), and mean size 2 1 SE (TL rnrn), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within San Antonio Bay during the 1995 fall commercial bay-shrimp season (1 5 August- 15 December). Table 15. Mean catch rate 5 1 SE in number (no.Ad9.8 m trawl) and weight (gW9.8 m trawl), and mean size + 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Aransas Bay during the 1993 spring commercial bay-shrimp season (1 5 May- 15 July). Table 16. Mean catch rate + 1 SE in number (no.Ml6.5 m trawl) and weight (gM16.5 m trawl), and mean size + 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Aransas Bay during the 1993 fall commercial bay-shrimp season (1 5 August-1 5 December). Table 17. Mean catch rate 2 1 SE in number (no.kd9.8 m trawl) and weight (gM9.8 m trawl), and mean size + 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Aransas Bay during the 1994 spring commercial bay-shrimp season (1 5 May-1 5 July). Table 18. Mean catch rate 5 1 SE in number (no.Ml6.5 m trawl) and weight (gM16.5 m trawl), and mean size + 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Aransas Bay during the 1994 fall commercial bay-shrimp season (1 5 August-1 5 December). Table 19. Mean catch rate 2 1 SE in number (no.Ad9.8 m trawl) and weight (gM9.8 m trawl), and mean size 2 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Corpus Chnsti Bay during the 1993 spring commercial bay-shrimp season (1 5 May- 15 July). Table 20. Mean catch rate 5 1 SE in number (no.Ml6.5 m trawl) and weight (gM16.5 m trawl), and mean size 2 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Corpus Christi Bay during the 1993 fall commercial bay-shrimp season (1 5 August-15 December). Table 21. Mean catch rate 2 1 SE in number (no.kd9.8 m trawl) and weight (gM9.8 m trawl), and mean size + 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in co-ercial shrimp trawls within corpus Christi Bay during the 1995 spring commercial bay-shrimp season (1 5 May- 15 July). Table 22. Mean catch rate + 1 SE in number (no.Ml6.5 m trawl) and weight (gM16.5 m trawl), and mean size 2 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within Corpus Christi Bay during the 1995 fall commercial bay-shrimp season (1 5 August-1 5 December). Table 23. Mean catch rate + 1 SE in number (no.lh1'9.8 m trawl) and weight (gIhl9.8 m trawl), and mean size 2 1 SE (TL rnm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within lower Laguna Madre during the 1993 spring commercial bay-shrimp season (1 5 May- 15 July). Table 24. Mean catch rate + 1 SE in number (no.M9.8 m trawl) and weight (gM9.8 m trawl), and mean size 2 1 SE (TL mm), of bycatch organisms and commercial shrimp caught in commercial shrimp trawls within lower Laguna Madre during the 1993 fall commercial bay-shrimp season (1 5 August-1 5 December). LIST OF FIGURES Figure 1. Texas bay systems where commercial shrimp bycatch characterization samples were collected from 1 993- 1995. Figure 2. Mean total bycatch catch per unit of effort (no./h/net) aboard commercial shrimp vessels sampled during spring and fall commercial bay-shrimp seasons within select bays and years from 1993-1995. Figure 3. Mean total bycatch catch per unit of effort (kg/h/net) aboard commercial shrimp vessels sampled during spring and fall commercial bay-shrimp seasons within select bays and years from 1993-1995. ACKNOWLEDGEMENTS This project was jointly funded by the Texas Parks and Wildlife Department and National Marine Fisheries Service Saltonstall-Kennedy Grant Program. Special thanks go to the Texas commercial bay shrimpers whose vessels samples were collected from, and all Coastal Fisheries staff who participated in bycatch sample collection and processing. This report is dedicated to Lany McEachron, former TPWD Coastal Fisheries Science Director, whose lifelong dedication to fisheries management and quality scientific data collection aided immensely in the successful completion of this study. ABSTRACT Commercial shrimp trawl bycatch samples were collected in Sabine Lake, Galveston Bay, ~ata~ordaBay, San Antonio Bay, Aransas Bay, Corpus Chnsti Bay and lower Laguna Madre to assess composition and magnitude of commercial bycatch along the Texas coast during the 1993, 1994, and 1995 spring and fall bay-shrimp open seasons.
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