To examine the transition to ureogenesis, the gobiid fish Mugilogobius abei was immersed in 2 mmol l(-)(1) NH(4)HCO(3) or a (15)N-labelled ammonia solution [1 mmol l(-)(1) ((15)NH(4))(2)SO(4), pH 8.0] for 4-8 days. When exposed to 2 mmol l(-)(1) NH(4)HCO(3) or (15)N-labelled ammonia solution for 4 days, the rate of urea excretion increased to seven times that of the control (in 20 % synthetic s...

A new species of dwarfgoby, Eviota piperata is described from Palau. It belongs to the cephalic sensory-pore system Group II (lacking only the IT pore); has a dorsal/anal-fin formula of 8/8; has some pectoral-fin rays branched; no dark spot over the ural centrum; the male genital papilla is not fimbriate; and the cheek and body are heavily peppered with chromatophores.

Abstract The challenges fish face in intraspecific communication has resulted adaptation different parts of their sensory system, including the auditory system. Evidence suggests that capability is specific for each species. otolith a part system teleost fish, and plays an important role maintaining balance hearing. According to previous research, morphological variation otoliths result synergy...

selenium, a trace mineral complement is used as cofactor of antioxidant enzymes that protects fishes against environmental stress agents and enhances performance in fishes. in this study the different levels of organic and inorganic source of  selenium were included in juvenile rainbow trout diet to evaluate feed conversion ratio (fcr), specific growth rate (sgr), weight gain percent (wg), cond...

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