Reproductive aspects of Acanthurus chirurgus (Perciformes: Acanthuridae) captured by the artisanal fleet operating in Itamaracá Island, Pernambuco, Brazil

Paulo R.  Souza-Almeida; Renata A.  Shinozaki-Mendes; Hilario Murua; María Korta; Paulo G.  Vasconcelos-Oliveira

doi:10.3989/scimar.05588.103

Authors

Paulo R. Souza-Almeida Federal Rural University of Pernambuco – Fishing and Aquaculture Departament https://orcid.org/0000-0002-0341-5530
Renata A. Shinozaki-Mendes Federal Rural University of Pernambuco – Fishing and Aquaculture Departament https://orcid.org/0000-0002-1850-4763
Hilario Murua International Seafood Sustainability Foundation https://orcid.org/0000-0001-8577-5291
María Korta AZTI-Tecnalia https://orcid.org/0000-0001-9180-0107
Paulo G. Vasconcelos-Oliveira Federal Rural University of Pernambuco – Fishing and Aquaculture Departament https://orcid.org/0000-0001-7697-2111

DOI:

https://doi.org/10.3989/scimar.05588.103

Keywords:

reef fish, spawning frequency, fecundity, conservation

Abstract

This study examined the reproductive biology of Acanthurus chirurgus through monthly collections from May 2016 to May 2018. A total of 505 specimens (317 males, 188 females) were analysed, with males having a larger total length than females (32.0 cm vs. 30.8 cm). The highest frequency of individuals was in the 23–25 cm size range. Reproduction occurred from January to July, with peak spawning in February, March and June. The first (L50) and maximum (L99) maturation sizes were 18.0 and 22.1 cm, respectively. Spawning was synchronous, occurring in batches and following an indeterminate fecundity pattern. Spawning frequency was estimated at every 4.2 days (hydrated oocytes) and 3.5 days (post-ovulatory follicles). Batch fecundity ranged from 15403.9 to 48030.9 oocytes, and relative batch fecundity from 2710628.5 to 16842518.6 oocytes. Due to the long reproductive period, recommendations include catch quotas, a closed season (February, March and June) and an 18 cm minimum size.

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