Resumo: A região de Vila do Conde é um importante pólo industrial no sul da baía de Marajó. Apesar da importância da pesca e da vulnerabilidade da região em relação ao impacto ambiental, não há nenhum estudo aprofundado sobre a pesca e a ictiofauna na área. Abstract: Vila do Conde is an important industrial complex in the south of the Marajó Bay. Despite the important fishery activity and the vulnerability in terms of environmental impacts, no relevant scientific study on fishery and ichthyofauna has been carried out in the area. This study aimed to describe the fishing activity by monitoring commercial landings of the main site (Praia do Conde) of the region between December 2005 and November 2006. The relative abundance index, catch-per-unit-of-effort (CPUE in kg/fishing trip), was used to identify the harvest season, species and fleet most relevant in the region. Forty-three boats were monitored, mainly small wooden boats. The main fishing gear was the long-line. The main local species were Brachyplatystoma rousseauxii (dourada catfish), Plagioscion squamosissimus (South American silver croaker), Pellona flavipinnis (yellowfin river pellona), P. castelnaeana (Amazon pellona) e B. filamentosum (filhote). Fleets caught an average of 19 kg/trip. Motorised boats were more productive than non-motorised. Two maximum harvest periods were observed: in January and September/October. The gross revenue of the fishery was over R$ 100,000.00. Wooden small boats contributed to 36% of the total catch.
Background. Diets, feeding ecology, and feeding strategies of several mangrove fish species have not been studied off the coast of Maranhão, which is exposed to a significant tidal regime. This includes also the largescale foureyed fish, Anableps anableps (Linnaeus, 1758). The aim of the presently reported study was to characterize diet, feeding strategies and seasonal patterns of the diet of A. anableps. Materials and methods. The sampling was carried out in São Marcos Bay between May 2007 and April 2008 using block nets. The stomach fullness index was used for stomach content analysis. Dietary items were identified and parameters such as the prey-specific abundance and the frequency of occurrence were calculated. The feeding strategy was analysed with the aid of the Costello diagram. Seasonal patterns in the feeding behaviour and similarity in diet composition were also analysed. Results. Diet composition did not differ between seasons but stomach fullness was greater in wet season months. The diet of A. anableps consisted of a mixture of epiphytic microalgae and macroalgae, insects, crustaceans, molluscs, fishes, and digested material such as mud and detritus. Insects represented the greatest richness among the food items. The Costello diagram revealed that A. anableps had a generalist feeding strategy, with a dominance of macroalgae, insect, and fishes. A broad niche was also found, as indicated by a strong association with interphenotypical components. Conclusion. This study presents data that confirm the forage characteristic of A. anableps and the influence of seasonality on its feeding behavior, in which the species takes advantage of the greater availability of food due to runoff and the larger flooded area, during the wet season. Further studies should be carried out to determine the energy needs of this species in satisfying its reproductive demands as well as the abundance of food resources in the surrounding environment and the confirmation of the generalist feeding strategy.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.