Abstract
The feeding habit of lane snapper Lutjanus synagris was analyzed qualitatively and quantitatively, related to seasonality, its ontogenetic development, and the relationship between food and biotic and abiotic conditions on the Amazon Coast of Maranhão, between June 2018 and May 2019. Numerical, gravimetric, and ecological index methods were used to show the relative importance or preference of a category or food item in the diet. The food composition was studied related to the sex, size of the predator and seasonality. Of 359 stomachs sampled, 54 were empty due to regurgitation and presented a vacuity coefficient (Cv%) of 15.04%. In the analysis of diets between the sexes, it was possible to identify a greater participation of fish (30.43%) and Crabs (26.10%) for females, Shrimp (36.23%) and Organic Matter Not Identified (OMNI) (18.84%) in males. The diet showed spatial differences in length distributions. The analysis of stomach contents showed the presence synthetic materials (mesoplastics ranging from 5.0 mm to 2.5 cm) in 5.52% of the samples. The main food items found were from the Brachyura and Caridea species. The results clearly demonstrate that lane snapper prefers benthic prey, presenting a carnivorous and generalist-opportunistic habit. Its diet is also composed of demersal-pelagic species, such as Cephalopods and Teleost fish.
Highlights
O hábito alimentar do ariacó Lutjanus synagris foi analisado qualitativamente e quantitativamente, relacionados à sazonalidade, seu desenvolvimento ontogenético e a relação entre alimento e condições bióticas e abióticas na Costa Amazônica do Maranhão, entre junho 2018 e maio de 2019
In the analysis of diets between the sexes, it was possible to identify a greater participation of fish (30.43%) and Crabs (26.10%) for females, Shrimp (36.23%) and Organic Matter Not Identified (OMNI) (18.84%) in males
In the analysis of diets between the sexes, it was possible to identify a greater participation of fish (30.43%) and Crabs (26.10%) in the diet of females, Shrimp (36.23%) and OMNI (18.84%) in males
Summary
O hábito alimentar do ariacó Lutjanus synagris foi analisado qualitativamente e quantitativamente, relacionados à sazonalidade, seu desenvolvimento ontogenético e a relação entre alimento e condições bióticas e abióticas na Costa Amazônica do Maranhão, entre junho 2018 e maio de 2019. The Lutjanidae species are part of one of the main marine fishing resources in tropical and subtropical areas from the western Atlantic, central-eastern United States, and Bermuda, including the Caribbean and the Gulf of Mexico and the entire coast of Brazil (Grimes, 1987; Hoese and Moore, 1998; Duarte and Garcia, 1999). They are widely exploited in Northeast Brazil by the commercial fishing, both for the volume of Fernandes et al Bol. Inst. Adult fish prefer reef areas, platforms, or continental slopes (Costa et al, 2005; Frédou and Ferreira, 2005; Klippel et al, 2005; Frédou et al, 2009), as they are areas where trophic interactions occur between organisms of different species at different stages of the life cycle (Layman, 2000)
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