A Review and the Length-Weight Relationship of Bluefish, Pomatomus saltatrix (Linnaeus, 1766), Pisces: Pomatomidae, at the Marine Extractive Reserve (RESEX-Mar) of Arraial do Cabo, Rio de Janeiro State, Brazil

摘要

The bluefish, Pomatomus saltatrix (Linnaeus, 1766), the only representative of the Pomatomidae family, is a key fishing resource that represents a substantial part of the landings at RESEX - Mar of Arraial do Cabo-RJ. The species is broadly distributed throughout the continental shelf in tropical and warm temperate waters of the Atlantic, Pacific and Indian Oceans. It forms pelagic, large and fast moving shoals in relatively deep offshore waters, and draws close to the coast when temperatures reach from 12℃ to 15℃. Its displacement is conditioned to the movement of shoals of small fish such as herings; shrimp and squid, all of which are preyed upon. This work had the main purpose of evaluating the growth of bluefish through the distribution of length frequency (One-Way-ANOVA) and the Relationship between Tota l Length—TL (mm) and Total Weight—TW (g)-LWR; from daily data collections from March/2017 to March/2018. The analyzed specimens were obtained at fish markets of Arraial do Cabo-RJ and fish landings at the Fishermen’s Harbor of Praia dos Anjos. They were randomly sampled from fragmented cohorts of the local stock. A total of N = 2057 specimens were primary analyzed. TL values varied from 201 mm (minimum) in February/2018 to 915 mm (maximum) in September 2017. The average TL was of 541 mm and the average TW of 1428.5 g. The value of angular coefficient “b” in the potential flow was 2.6, and the value of “a” was 9E-05, expressed by the equation W = aL b) for overall, where W = TW and L = TL. Values of W = 3E-05L 2.7 ) were found for females and W = 2E- 05L 2.8) for males. Knowledge over their general biology is extremely important when it comes to knowing the ecology of this species for subsidize a future and adequate fishery management.