Quantification of interactions between the Portuguese sardine purse-seine fishery and cetaceans

Authors: 

Marcalo, A., Katara, I., Feijo, D., Araugo, H., Oliveira, I., Santos, J., Ferreira, M., Monteiro, S., Pierce, G.J., Silva, A. and Vingada, J.

Year: 

2015

Journal/Publisher Name: 

ICES Journal of Marine Science

Volume (Issue #): 

doi:10.1093/icesjms/fsv076

Contact information: 

amarcalo@gmail.com
Summary: 

A study was conducted on observed interactions between a Portuguese purse-seine fishery and cetaceans. Cetaceans, primarily common dolphins (Delphinus delphis), were present during 16.9% of fishing events. The majority of these occurrences happened during the summer and early fall, and during the night. The presence of cetaceans was significantly linked to sardine catches, effort and latitude/longitude. Encirclement of cetaceans occurred in 2.3% of fishing events, with moralities occurring in 1%. Common dolphin, bottlenose dolphin (Tursiops truncatus) and harbor porpoise (Phocoena phocoena) were all encircled, with moralities only recorded for common dolphins. Estimated annual mortality rates for the common dolphin are 113 individuals.