Spatiotemporal Variability of the Catch Composition and Discards Estimates of the Different Methods of Onboard Preservation for the Brazilian Sardine Fishery in the Southwest Atlantic Ocean
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Rafael Schroeder [1] ; Alberto Teodorico Correia [2] ; Solange Dias Medeiros [1] ; Marcos Luiz Pessatti [1] ; Paulo Ricardo Schwingel [1]
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[1] Universidade do Vale do Itajaí
Universidade do Vale do Itajaí
Brasil
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[2] Universidade Fernando Pessoa
Universidade Fernando Pessoa
Santo Ildefonso, Portugal
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- Localización: Thalassas: An international journal of marine sciences, ISSN 0212-5919, Vol. 38, Nº. 1, 2022, págs. 573-597
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
A new method of fsh preservation in refrigerated brine was implemented in 2008 for the Brazilian sardine purse seine fshery, in order to improve the fsh quality available to the consumer compared to the traditional ice preserving method.
This preservation method shifts increased the autonomy of the vessels, drastically changed the catch composition and had an impact on the non-target species. The efects of this new preservation method were evaluated from catch reports monitored by onboard scientifc observers and from post-landing data using uni- and multivariate techniques. Discards assessment was also conducted in the canning industry based on the percentage of sardines without quality for the preparation of conserves, on other caught species than sardines, and on the proportion of individuals under the minimum size of capture. The hereby data was consistent with the previous historical datasets (2000–2013) of species composition. However, vessels using diferent methods of preservation showed signifcant diferences regarding the records of non-target species, and catch volume of most aquatic taxa present in the refrigerated brine vessels was smaller. Moreover, information obtained from the canning industry recorded higher catches of Sardinella brasiliensis (target species), as well as large amounts of small sardines and sardines without quality for the preparation of the conserves, and other bycatch species. These fndings were related to a great fshing power and autonomy of the modern refrigerated vessels that could explore fshing areas with distinct oceanographic features
