Status, Habitat, and Harvest Patterns of Atlantic Stingray in Western Gulf of America Estuaries
摘要
Atlantic stingray (Hypanus sabinus) is a common species of dasyatid stingray that occurs in nearshore waters along the western Atlantic Ocean and into the Gulf of America (Gulf). There is concern for elasmobranch populations given the low fecundity and often slow growth and maturation rates of these species. This study is the most comprehensive assessment of the Atlantic stingray population in the western Gulf. The objectives were to (1) describe size class specific trends for Atlantic stingray, (2) examine harvest patterns, and (3) assess size class specific habitat suitability in Texas bays. Analysis of long-term fishery-independent seine and trawl datasets revealed strong spatial and temporal variation in abundance across bay systems with varying differences between seine and trawl sampling methods potentially reflecting gear-related biases and highlighting the importance of multi-gear sampling efforts. Differences in abundance among bay systems could be as large as 31-fold for seines (adults) and 43-fold for trawls (young-of-year). Annual trends in abundances among bay systems included positive, negative, and no trend, with trawl sampling identifying more negative trends in abundance compared to seines. Habitat analyses indicated a preference for lower estuarine regions (i.e., closer to the tidal pass), with juvenile and young-of-year showing increased concentrations in areas near tidal passes. Commercial and recreational landings were observed to be relatively low for the species, but notable increases in harvest from bay systems such as Galveston Bay and likely underreporting from commercial landings combined with variable population trends highlights the need for continued monitoring and increased vigilance from scientists and managers.