Four experiments were conducted on auditory sensitivity and discrimination of goldfish within the acoustic near field. Experiment I studied the effects of the near field on sound pressure thresholds. The sensitivity of goldfish in terms of sound pressure appeared to vary with distance from the sound source. Experiment II studied stimulus generalization and frequency discrimination within the ne...

one of the pollutant materials in aquatic ecosystems is detergents that are inappropriate due to the increasing population in the world and in different ways to produce large amounts of groundwater and open surface water resources. these entry detergents to aquatic ecosystems can have adverse effects on aquatic life. so in current study acute toxicity of bleach on fry species of bighead carp an...

Chamberland V, Rioux P. Not only students can express alcohol dehydrogenase: goldfish can too! Adv Physiol Educ 34: 222–227, 2010; doi:10.1152/advan.00088.2009.—This article describes a novel approach to study the metabolic regulation of the respiratory system in vertebrates that suits physiology lessons for undergraduate students. It consists of an experimental demonstration of the goldfish’s ...

A potential role for prolactin-releasing peptide (PrRP) in appetite regulation and hydromineral balance in goldfish was examined. PrRP was found to be expressed in discrete regions of the goldfish brain, in particular, the hypothalamus. Intraperitoneal (IP) or intracerebroventricular administration of PrRP had dose-dependent effects to suppress food intake in goldfish. Hypothalamic PrRP mRNA ex...

Adaptive responses of the livers of goldfish (Carassius auratus) exposed to five concentrations of 3,3’-dimethyl-benzidine (DMBz) (0.9-9.0 mg/L) for 3, 7 or 14days (d) relative to unexposed goldfish were investigated. A suite of antioxidant parameters including glutathione (GSH) concentration and activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and glutathi...

The aromatase inhibitor, fadrozole, was applied to common carp and goldfish in order to examine its ability to increase the spontaneous and sGnRHa stimulated LH secretion. First, trials in goldfish in 2003 showed fadrozole's moderate ability to potentiate sGnRHa-stimulated LH secretion. However, this ability was much weaker than that obtained with dopamine antagonist, pimozide. There was no ovu...

The amino acids L-glutamate and L-aspartate depolarize H1 horizontal cells in the perfused goldfish retina but only at millimolar concentrations. The effects of L-glutamate (but not of L-aspartate) are potentiated approximately 15-fold by exposure to D-aspartate. D-Aspartate blocks acidic amino acid uptake in goldfish retina, so that the potentiation of L-glutamate may be produced by an increas...

In mammals, neuropeptide Y (NPY) is a potent orexigenic factor. In the present study, third brain ventricle (intracerebroventricular) injection of goldfish NPY (gNPY) caused a dose-dependent increase in food intake in goldfish, and intracerebroventricular administration of NPY Y1-receptor antagonist BIBP-3226 decreased food intake; the actions of gNPY were blocked by simultaneous injection of B...

Goldfish were classically conditioned to discriminate between 532 nm and 635 nm lights while light adapted, and then tested for their ability to continue the dis~mjnation as the intensities were reduced. In all tests, the two stimuli were balanced for effectiveness at absolute threshold. We find that goldfish can discriminate between these wavelengths about I log unit above absolute threshold. ...

This study was conducted to evaluate the effects of diets containing 0, 100, 200 and 300 mg of carotenoid/kg diet from marigold meal on skin pigmentation, growth, feed utilization and survival of goldfish (Carassius auratus), with average initial weight of 1.8 g for a rearing period of 63 days. The pigmentation degree in skin of goldfish increased significantly with increasing inclusion of mari...