Feeding and trophic relationships of the swordfish (Xiphias gladius Linnaeus, 1758), off central and northern Chile during 2005

Sergio Letelier, Roberto Meléndez, Esteban Carreño, Sebastián Lopez, Patricio Barría


DOI: https://doi.org/10.3856/vol37-issue1-fulltext-9

A total of 126 sword-fish (Xiphias gladius) stomach were analyzed. The stomachs were obtained from specimens captured within the 25º to 34ºS and 78º to 90ºW area, by industrial longline vessels. Only 72 (57.1%) of the total stomach had food items in their stomachs, whit a sex proportion of 32 males (44.4%), 37 females (51.4%) and 3 indeterminate (4.2%). Traditional methods for the stomach contents analysis such as the numeric, frequency of occurrence, gravimetric and index of relative importance (IRI) were used. Cephalopods were the main food items (%IRI > 90) followed by the fishes (%IRI < 4). The squid (Dosidicus gigas) was the principal food in this study (%IRI = 85.1). No significant differences were found between the feeding of males and females of swordfishes (U = 81; p = 0.4862, p < 0.05). A cluster analysis showed higher stomach contents similarity between fall and winter than those from spring, within the size groups the I group was different than others and finally, the feeding from zone 3 were different from others zones.

Letelier S, Meléndez R, Carreño E, Lopez S, Barría P. Feeding and trophic relationships of the swordfish (Xiphias gladius Linnaeus, 1758), off central and northern Chile during 2005. Lat. Am. J. Aquat. Res.. 2017;37(1): 107-119. Available from: doi:10.3856/vol37-issue1-fulltext-9 [Accessed 17 Aug. 2019].
Letelier, S., Meléndez, R., Carreño, E., Lopez, S., & Barría, P. (2017). Feeding and trophic relationships of the swordfish (Xiphias gladius Linnaeus, 1758), off central and northern Chile during 2005. Latin American Journal of Aquatic Research, 37(1), 107-119. doi:http://dx.doi.org/10.3856/vol37-issue1-fulltext-9