Population dynamics of Rimapenaeus constrictus (Stimpson, 1874) (Penaeoidea) on the southeastern Brazilian coast: implications for shrimp fishing management from a 5-year study on a bycatch species

Author(s)

Lopes, Ana Elisa B. ; Grabowski, Raphael C. ; Garcia, Joyce R. ; Fransozo, Adilson ; da Costa, Rogerio C. ; Hiroki, Katia A. N. ; Castilho, Antonio L.

• Document type: Journal article
• Source: Anais da Academia Brasileira de Ciências; v. 89, n. 2, p. 13-pg., 2017-06-01.

Abstract

This is the first study to evaluate in broad spatiotemporal scales the growth parameters and population structure of Rimapenaeus constrictus, a barely damaged species composing the bycatch from shrimp fishing in the Western Atlantic. The abundance and size-class frequency distribution, growth, longevity and sex ratio were evaluated from monthly samples obtained in the northern littoral of Sao Paulo state from Jan/1998 to Jun/2003. We measured 5,812 individuals in which the sex ratio was skewed toward females; this was more evident in size classes greater than 10 mm in CL (carapace length) (binomial test, p< 0.05). We selected 16 growth cohorts of females, and 8 of males, the majority consisting of younger individual cohorts excluded from the fisheries closure period. Growth estimates resulted in a CL infinity of 17.42 mm, a growth coefficient of 0.008 and a longevity of 579 days (1.60 year) for females, as well as a CL infinity of 16.3 mm, a growth coefficient of 0.01 and a longevity of 425 days (1.17 year) for males. Our results provide information of incontestable relevance to our knowledge of fishing management. We therefore strongly recommend that the fisheries closure period be changed to protect this species' recruitment period and consequently its adult individuals. (AU)

• FAPESP's process: 10/50188-8 - Decapod crustaceans: multi-disciplinary characterization of the sea biodiversity of the State of São Paulo (taxonomy, spermiotaxonomy, molecular biology and population dynamics)
• Grantee: Fernando Luis Medina Mantelatto
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants
• FAPESP's process: 98/07090-3 - Benthic marine biodiversity in the state of São Paulo
• Grantee: Antonia Cecília Zacagnini Amaral
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants
• FAPESP's process: 15/13639-5 - Growth and reproductive dynamics of the shrimp Rimapenaeus constrictus (Stimpson, 1874) (Penaeoidea) in the Northern Coast of São Paulo: synthesis of a 5-year study
• Grantee: Ana Elisa Bielert Lopes
• Support Opportunities: Scholarships in Brazil - Master