Age and growth of two sharpnose shark species (Rhizoprionodon lalandii and R. porosus) in subtropical waters of the south-western Atlantic
Jéssica T. Corsso
A , Otto B. F. Gadig B , Fabio P. Caltabellotta C D , Rodrigo Barreto E and Fabio S. Motta A F
+ Author Affiliations
- Author Affiliations
A Laboratório de Ecologia e Conservação Marinha, Instituto do Mar, Universidade Federal de São Paulo, Rua Dr Carvalho de Mendonça 144, Encruzilhada, Santos, SP 11070-100, Brazil.
B Laboratório de Pesquisa de Elasmobrânquios, Instituto de Biociências, Universidade Estadual Paulista, Campus do Litoral Paulista, Praça Infante Dom Henrique, Parque Bitaru, São Vicente, SP 11330-900, Brazil.
C Coastal Oregon Marine Experiment Station, Oregon State University, 2030 SE Marine Science Drive, Newport, OR 97365, USA.
D Fisheries and Aquatic Sciences Program, School of Forest Resources and Conservation, University of Florida, 118 Newins-Ziegler Hall, PO Box 110410, Gainesville, FL 32611-0410, USA.
E Centro Nacional de Pesquisa e Conservação da Biodiversidade Marinha do Sudeste e Sul do Brasil, Instituto Chico Mendes de Conservação da Biodiversidade, Avenida Carlos Ely Castro, 195 Centro, Itajaí SC, 88301-445, Brazil.
F Corresponding author. Email: fmotta@unifesp.br
Marine and Freshwater Research - https://doi.org/10.1071/MF19379
Submitted: 5 December 2019 Accepted: 17 July 2020 Published online: 17 September 2020
Abstract
The age and growth of subtropical populations of the Brazilian and Caribbean sharpnose sharks (Rhizoprionodon lalandii and R. porosus respectively) were determined by combining direct and indirect ageing methods, maximising the use of available information. Using vertebrae ageing for R. lalandii, the theoretical maximum length L∞ and growth coefficient k were 661.9 mm and 1.14 year–1 for males and 751.7 mm and 0.59 year–1 for females. Vertebrae were not sampled for R. porosus. Values of L∞ and k from electronic length–frequency analyses (ELEFAN) were 762 mm and 0.71 year–1 for male R. lalandii, 791 mm and 0.67 year–1 for female R. lalandii, 1040 mm and 0.41 year–1 for male R. porosus and 1165 mm and 0.31 year–1 for female R. porosus. Growth during the first year of life in relation to birth size was 80.3% for R. lalandii and 55% for R. porosus. Both species exhibit rapid growth, primarily in the first year of life. The growth estimates for R. lalandii and R. porosus are even faster than those reported in previous studies from tropical populations.
Keywords: elasmobranch, fishery management, length–frequency ageing, life history, vertebrae ageing.
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