Age and growth of two sharpnose shark species (Rhizoprionodon lalandii and R. porosus) in subtropical waters of the south-western Atlantic

Author(s)

Corsso, Jessica T. ^[1] ; Gadig, Otto B. F. ^[2] ; Caltabellotta, Fabio P. ^{[3, 4]} ; Barreto, Rodrigo ^[5] ; Motta, Fabio S. ^[1]

Affiliation

^[1] Univ Fed Sao Paulo, Inst Mar, Lab Ecol & Conservacao Marinha, Rua Dr Carvalho de Mendonca 144, BR-11070100 Santos, SP - Brazil

^[2] Univ Estadual Paulista, Inst Biociencias, Lab Pesquisa Elasmobranquios, Campus Litoral Paulista, BR-11330900 Sao Vicente, SP - Brazil

^[3] Oregon State Univ, Coastal Oregon Marine Expt Stn, 2030 SE Marine Sci Dr, Newport, OR 97365 - USA

^[4] Univ Florida, Sch Forest Resources & Conservat, Fisheries & Aquat Sci Program, 118 Newins Ziegler Hall, POB 110410, Gainesville, FL 32611 - USA

^[5] Inst Chico Mendes Conservacao Biodiversidade, Ctr Nacl Pesquisa & Conservacao Biodiversidade Ma, Ave Carlos Ely Castro, 195 Ctr, BR-88301445 Itajai, SC - Brazil

• Document type: Journal article
• Source: MARINE AND FRESHWATER RESEARCH; v. 72, n. 3, p. 398-410, 2021.
• Web of Science Citations: 0

Abstract

The age and growth of subtropical populations of the Brazilian and Caribbean sharpnose sharks (Rhizoprionodon lalandiiandR. porosusrespectively) were determined by combining direct and indirect ageing methods, maximising the use of available information. Using vertebrae ageing forR. lalandii, the theoretical maximum length L-infinity and growth coefficientkwere 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 forR. porosus. Values ofL(infinity)andkfrom electronic length-frequency analyses (ELEFAN) were 762 mm and 0.71 year(-1)for maleR. lalandii, 791 mm and 0.67 year(-1) for femaleR. lalandii, 1040 mm and 0.41 year(-1)for maleR. porosusand 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. lalandiiand 55% forR. porosus. Both species exhibit rapid growth, primarily in the first year of life. The growth estimates forR. lalandii and R. porosus are even faster than those reported in previous studies from tropical populations. (AU)

• FAPESP's process: 10/02397-7 - Population dynamics of the guitarfishes Rhinobatos horkelli, Rhinobatos percellens and Zapteryx brevirostris (Chondrichthyes, Rhinobatidae)of the Sao Paulo Continental Shelf, Brazil
• Grantee: Fabio Prior Caltabellotta
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 12/00713-4 - Age, growth and mortality of the Brazilian sharpnose shark, Rhizoprionodon lalandii, from south-central coast of São Paulo state: contributions to conservation and fishery management
• Grantee: Fabio dos Santos Motta
• Support Opportunities: Scholarships in Brazil - Post-Doctoral