Growth, mortality, and reproduction of Tagelus plebeius (Bivalvia: Solecurtidae) in Southeast Brazil

Autor(es)

da Silva, Camila Fernanda ^[1] ; Corte, Guilherme Nascimento ^[1] ; Yokoyama, Leonardo Querobim ^[2] ; Abrahao, Jolnnye Rodrigues ^[2] ; Zacagnini Amaral, Antonia Cecilia ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas UNICAMP, Inst Biol, Dept Biol Anim, Lab Bentos Marinho, Programa Posgrad Ecol, BR-13083862 Campinas, SP - Brazil

^[2] Univ Estadual Campinas UNICAMP, Inst Biol, Dept Biol Anim, Lab Bentos Marinho, BR-13083862 Campinas, SP - Brazil

• Tipo de documento: Artigo de Revisão
• Fonte: HELGOLAND MARINE RESEARCH; v. 69, n. 1, p. 1-12, MAR 2015.
• Citações Web of Science: 3

Resumo

Tagelus plebeius (Lightfoot, 1786) is a stout razor clam that is economically exploited in several countries, including several local fisheries along the Brazilian coast. Despite its wide distribution and economic importance, there are few studies that have examined the population biology of this species. This study aimed to improve the current knowledge about the biology of T. plebeius by investigating its growth and mortality on a subtropical sandy beach in Southeast Brazil over a 1-year period. In addition, the reproduction of T. plebeius was analyzed through qualitative and quantitative histological analyses during the last 7 months of the study. The parameters of the von Bertalanffy growth function were estimated to be L (a) = 74.14 mm, K = 0.52 year(-1), C = 0.47, and WP = 0.94. The instantaneous mortality rate (Z) was 2.16 year(-1), and the life span was 2.58 years. We confirmed variations (H = 651.35; P < 0.05) in the shell length over the months of the study, and the recruitment was higher-but still low-in summer. Four cohorts were observed in the distribution of shell length frequencies. The sex ratio of the population was 1:1 during the study period, and a synchronism in gonadal development and spawning was found between males and females. The high mortality (Z) and low recruitment rates can be interpreted as reflecting that the population of T. plebeius is under a low restoration process and could be an indication that this species has an endangered status in the study area. (AU)

• Processo FAPESP: 06/53561-6 - Morfometria, crescimento e reproducao de tagelus plebeius (lightfoot, 1786) (bivalvia: solecurtidae).
• Beneficiário: Camila Fernanda da Silva
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica