Experimental fishing of the shrimp fleet of Rio Grande do Norte, northeastern Brazil; highlighting the population structure of Penaeus schmitti and Penaeus subtilis (Crustacea: Penaeidae)
DOI:
https://doi.org/10.1590/2675-2824074.25035Keywords:
Southern brown shrimp, Southern white shrimp, Populational biology, Relative growth, BycatchAbstract
This study aimed at defining the catch composition of the shrimp fishery off the coast of Rio Grande do Norte state (06°21’S/35°01’W) and estimating population parameters for Penaeus subtilis and P. schmitti in 2013-2018. Fish bycatch represented most of the biomass. The biomass of P. schmitti showed a weak positive correlation with maximum temperature. The biomass of P. subtilis showed a weak negative correlation with the average pH. An increase in the capture of P. subtilis corresponded to a decrease in P. schmitti. A total of 2,665 specimens of P. schmitti were analyzed, with a sex ratio of F:M=0.74. The carapace length (CL) of the females ranged from 5.70 to 43.20 mm and for males from 8.10 to 36.70 mm. The total weight (TW) of females ranged from 1.12 to 54.1 g (TW=0.0040CL2.5229) and for males from 1.22 to 32.43 g (TW=0.0021CL2.7444). A total of 1,404 specimens of P. subtilis were analyzed, with a sex ratio of F:M=1.42. The CL of females ranged from 5.30 to 29.71 mm and that of males, from 8.30 to 25.42 mm. The TW of females ranged from 0.46 to 20.75 g (TW=0.0028CL2.5999) and that of males, from 0.43 to 13.09 g (TW=0.0026CL2.6405). Continued monitoring of catch composition and population parameters is recommended for proper stock management.
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