Volumen 53 - Supl. 1 - 57-62

Rev. biol. mar. oceanogr. 53(S1): 57-62 Nota Científica
DOI: http://dx.doi.org/10.22370/rbmo.2018.53.0.1255
Ecología trófica de dos peces de la familia Gempylidae en aguas oceánicas del Pacífico Sur Oriental
Carlos Canales-Cerro¹, Patricio Barria², Patricia Zárate^3,4, Jorge Azócar³, Roberto Meléndez^† y Sebastian Klarian^1,5,6*
¹Centro de Investigación para la Sustentabilidad CIS, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, Av. República 440, Santiago, Chile ²Departamento de Evaluación de Pesquerías, División de Investigación Pesquera, Instituto de Fomento Pesquero, Blanco 839, Valparaíso, Chile ³Departamento de Oceanografía y Medio Ambiente, División de Investigación Pesquera, Instituto de Fomento Pesquero, Blanco 839, Valparaíso, Chile ⁴Facultad de Medicina Veterinaria y Agronomía, Universidad de la Américas, 7 Norte 1348, Viña del Mar, Chile ⁵Centro de Investigación Marina Quintay CIMARQ, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, Av. Quillota 980, Viña del Mar, Chile ⁶Laboratorio de Análisis Isotópico, Universidad Andres Bello, Av. Quillota 980, Viña del Mar, Chile
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In the Chilean coast, sharks and rays are one of the least studied fish groups, therefore quantitative data about their parasites are scarce or almost non existing. Copepod parasites were collected from different sites along corporal body of Prionace glauca (n= 12) and of Isurus oxyrinchus (n= 1) captured onboard cruise OCEARCH during March and April 2014. Three species belonging to the Pandaridae family were identified: Echthrogaleus coleoptratus, Dinemoura producta and Nessipus orientalis. The latter species is here recorded for the first time in Chilean waters. These copepods did not show infection site preferences along host body. Considering the wide range of hosts described for these parasite species, it is concluded they are generalist parasites of wide geographic distribution The feeding of the escolar fishes Ruvettus pretiosus and Lepidocybium flavobrunneum has not been reported yet for southeastern Pacific waters. The main goal of this work was to study the trophic relationships using stomach contents and stable isotopes, 15N and 13C, based on mixing models. Results showed that both fish had differences in the importance of the prey, feeding strategy and habitat use. Also, they presented similar values of 15N (^~20‰) and 13C (^~-16‰), but a low probability of niche overlapping.
Key words: Snake mackerels, diet, stomach content, stable isotopes, isotopic niche, Chile