Xchel G. Moreno-Sánchez

First case of synophthalmia and albinism in the Pacific angel shark Squatina califórnica

The first record in Mexican waters of albinism and synophthalmia (partial cyclopia) in the Pacific angel shark, Squatina californica is presented. Albinism is not lethal, but synophthalmia may cause the death of the individual immediately after birth.

Trophic spectrum of the juvenile roosterfish, Nematistius pectoralis Gill, 1862 (Perciformes: Nematistiidae), in Almejas Bay, Baja California Sur, Mexico

Este trabajo es la primera contribucion al conocimiento de la dieta del Pejegallo Nematistius pectoralis, capturado en Bahia Almejas, Baja California Sur, Mexico. Se describe cualitativa y cuantitativamente el espectro trofico de 59 ejemplares de N. pectoralis, usando los metodos tradicionales de frecuencia de aparicion, numerico y peso, asi como el indice de importancia relativa. En Total se identificaron 10 especies presa de las cuales 9 fueron peces y un cefalopodo. Se determino que el pejegallo, es un depredador ictiofago activo el cual incide principalmente sobre especies de peces que forman cardumenes como los son Eucinostomus dowii, E. gacilis, Anchoa ischana y Anchoa spp.

OCCURRENCE OF COHO SALMON, ONCORHYNCHUS KISUTCH (ACTINOPTERYGII: SALMONIFORMES: SALMONIDAE), OFF THE WEST COAST OF BAJA CALIFORNIA SUR, MEXICO

We provide the first record of a coho salmon, Oncorhynchus kisutch (Walbaum, 1792), off the west- ern coast of Baja California Sur, Mexico, approximately 690 km south of the previously reported distribution in the Northwest P acific. The specimen was captured in the regional commercial fishery. It was a female, 520 mm standard length, weighing 1855 g. Morphometric and meristic data are presented.

Incidence of xanthism in the leopard grouper Mycteroperca rosacea (Perciformes: Serranidae) in the Gulf of California

Five leopard grouper Mycteroperca rosacea specimens were captured in the Gulf of California, two of which presented a rare orange pigmentation on both sides of the body. The remaining individuals presented changes to the normal pigmentation pattern on the left or right flanks. The possible causes of these phenomena are discussed.