Contribution to the knowledge on the diet, feeding activity, and reproduction of Lolliguncula brevis (Blainville, 1823) in the coastal region of Santos (São Paulo State)

Author(s)

Coelho, Leandro Inoe ; Muto, Elizabeti Yuriko ^[2] ; Marian, José Eduardo Amoroso Rodriguez ^[3] ; Soares, Lucy Satiko Hashimoto

• Document type: Journal article
• Source: Boletim do Instituto de Pesca; v. 36, n. 3, p. 225-236, 2010.
• Field of knowledge: Biological Sciences - Zoology

Abstract

This study aimed to investigate the diet and feeding activity of the squid Lolliguncula brevis in the coastal region of Santos. Sex ratio and maturity stages of the specimens were also evaluated. The sampling was carried out in September 2005 and March 2006 in Santos Bay and the continental shelf off Santos. A total of 181 specimens from 17 to 50mm of mantle length were caught between the depths of 8.9 and 26.5m. The sex ratio was 1.7 females: 1 male; males attain gonadal maturity at smaller size than females. In both periods, most males were mature, the smallest of them measuring 23mm of mantle length. The smallest mature female measured 32mm, while all females larger than 40mm were mature. The results of the digestion degree, the fullness degree and the fullness index suggest that the food intake occurs throughout the day, but with higher intensity at dusk; however, samples from the dark period of the day were not collected. The items identified in the stomach contents were crustaceans, bony fish, cephalopods, bryozoans, and nematodes. Crustaceans were the most important food for all size classes. However, as the squid body enlarged, the importance of fish in the diet increased and that of crustaceans decreased. The relative contribution of crustaceans in the diet was greater during the afternoon and dusk, and that of fish during the morning. (AU)

• FAPESP's process: 03/09932-1 - Influence of the estuarine complex of the Baixada Santista on the ecosystem of the adjacent platform (ECOSAN)
• Grantee: Ana Maria Setubal Pires-Vanin
• Support Opportunities: PRONEX Research - Thematic Grants
• FAPESP's process: 04/13212-7 - Reproductive biology of Loligo plei Blainville, 1823 (Cephalopoda: Loliginidae): descriptive and functional anatomy of the male and female reproductive systems and histological evidence
• Grantee: José Eduardo Amoroso Rodriguez Marian
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)