Fecundity of fishes inhabiting coastal and estuarine environments in the southwest Atlantic Ocean

ABSTRACT

The aim of this study was to estimate the fecundity of six marine fish species from the southwest Atlantic off the coast of São Paulo State, Brazil. In particular, the number of oocytes in the most advanced vitellogenic stage (NDO), batch fecundity and the number of batches that will be produced were estimated. Specimens of longfinger anchovy Anchoa filifera, atlantic anchoveta Cetengraulis edentulus, bay whiff Citharichthys spilopterus, Stellifer brasiliensis, rake stardrum S. rastrifer and southern kingcroaker Menticirrhus americanus were captured bimonthly, from June (2012) to May (2013). The mature ovaries were removed, weighed, fixed in formalin solution and histologically analysed. All histological sections were photographed and the images analysed using advanced image processing techniques. The estimated number of batches that will be recruited to the germinal vesicle migration/hydrated stock ranged from one to four batches. NDO is positively related to ovarian and female size. Small females with low ovary weight produce low NDO. The NDO in A. filifera, C. edentulus and M. americanus may represent the final number of oocytes to be spawned in the next spawning event, which could be used for batch fecundity estimation. This study contributes to a better understanding of the reproduction of species inhabiting shrimp fishery grounds which are caught as by-catch in tropical and subtropical ecosystems. Information on the maturity and fecundity of these populations is an important element in assessing stock status and the degree of fishing pressure these populations are experiencing.

RESPONSIBLE EDITOR:

• Sanja Matic-Skoko

KEYWORDS:

• Indeterminate fecundity
• marine fishes
• oocyte production
• stereology

Acknowledgements

The first author would like to thank the AZTI-Tecnalia Foundation (Marine Research Division) for availability of equipment and Dr Holger Haslob from the Johann Heinrich von Thünen-Institute/Institute of Sea Fisheries for his availability and help with the grids and ImageJ routine. Thanks also to Dr Jerry Scott for editing the English. This research was conducted with the approval of the Institute for Biodiversity Conservation of the Brazilian Ministry of Environment (permit number 18493–1) and the Ethics Committee on Animal Experiments of the Institute of Oceanography of the University of São Paulo, Brazil.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors are grateful to the Institute of Oceanography/University of São Paulo (IOUSP) for sampling support and to the Post-graduate Program in Oceanography/CAPES for a Doctorate Scholarship (grant number 7546/13–0).