Echosounder surveys reveal that small fish escape from the Gulf Corvina fishery
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- Date Issued
- Date Collected
- 2014-03-27 to 2014-04-28
- Cite This Work
Rowell, Timothy J; Erisman, Brad (2018): Echosounder surveys reveal that small fish escape from the Gulf Corvina fishery. In dataMares: Fisheries. UC San Diego Library Digital Collections. http://doi.org/10.6075/J0G73BW4
In 2014, six echosounder surveys were conducted to estimate the abundance and mean lengths of Gulf Corvina (Cynoscion othonopterus) at their spawning grounds in the Colorado River Delta, Mexico, for comparison to fishery landings. The overall mean length of Gulf Corvina within the Delta was estimated to be 49 cm, with variation among surveys. In contrast, the mean length of Gulf Corvina captured within the fishery was 67 cm. The observation of small fish at the spawning grounds that are absent in fisheries landings suggests that the fishery is highly selective for large fish and allows for the escapement of the more abundant smaller fish that may provide a percentage of the reproductive output necessary to sustain the fishery. The near-absence of fish greater than 80 cm in the fishery and mean lengths greater than 64 cm in the echosounder surveys indicates low survival rates for older and more fecund fish.
Echosounder surveys. This dataset includes the mean lengths of Gulf Corvina per individual echosounder transect across three survey days.
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Inquiries should be directed to Timothy J. Rowell (email@example.com)
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- Technical Details
Software used: Microsoft Excel, Matlab, Echoview. Coordinate system: UTM WGS1984.
- Related Resource
- Timothy J. Rowell, Brad Erisman (2016): Echosounder surveys reveal that small fish escape from the Gulf Corvina fishery. DataMares. InteractiveResource.
- Timothy J. Rowell, Brad Erisman (2016): Estudios con ecosonda revelan que los peces pequeños escapan la pesquería de curvina golfina. DataMares. InteractiveResource.
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