Fish eosinophilic granular cells are found in the connective tissues of structures associated with external environment. These similar to mammalian mast terms structural and functional characteristics. The cytoplasmic granules these give different staining reactions depending on fixative type. This study aimed determine properties densities Oscar fish (Astronotus ocellatus Agassiz, 1831) intest...

Oscars are often subjected to a combination of low levels of oxygen and fasting during nest-guarding on Amazonian floodplains. We questioned whether this anorexia would aggravate the osmo-respiratory compromise. We compared fed and fasted oscars (10-14 days) in both normoxia and hypoxia (10-20 Torr, 4 h). Routine oxygen consumption rates (O2) were increased by 75% in fasted fish, reflecting beh...

IT has long been considered a general rule for nerve regeneration that the reinnervation of skeletal muscle is nonselective. Regenerating nerve fibers are supposed to reconnect with one skeletal muscle as readily as another according to studies covering a wide range of vertebrates (Weiss, 1937; Weiss & Taylor, 1944; Weiss & Hoag, 1946; Bernstein & Guth, 1961; Guth, 1961, 1962, 1963). Similarly,...

This research was carried out to determine the intraocular pressure values, optimum anesthesia dose and phenotypic characteristics in Oscar fish (Astronotus ocellatus). A total of 11 adult, male were used study. Optimum dose, pre-and post-anesthesia values measurements (total length, fork standard dorsal fin base head body eye diameter, depth, pectoral pelvic bottom anal length) determined refe...

a bacterial septicaemia occurred in 3-female oscars (astronotus ocellatus) of about 2-year old held in 300l freshwater aquaria in south tehran. the external signs of infected fish consisted of lethargy, anaemia, distension (clinical dropsy), exophthalmia and cataract. internally there was a large amount of red-ascitic fluid accumulated in the abdominal cavity with haemorrhages/ hyperaemia of in...