Costly anti-predator traits tend to be expressed only in high-predation conditions. For the cyprinid fish genus Carassius, deeper body depth is more adaptive to avoid predation by gape-limited piscivorous fish, but it raises swimming costs. It is therefore predicted that the relative body depth will decrease when the prey fish has reached a size larger than the predator gape-size. This predicti...

HE sex determining mechanism in diploid Drosophila melanogaster is T completely stable. No intersexual individuals are produced from hybridizing strains of D. melanogaster collected from widely separated geographical localities. In Lymantria, on the contrary, GOLDSCHMIDT (1934) has shown that the potencies of the X chromosome sex gene differs in races from Europe and Japan. The degree of sexual...

The introduction of non-native fish species is known to have adverse effects on aquatic ecosystems, but their effect plateau lakes not well studied. In this study, we examined the Japanese smelt (Hypomesus nipponensis) invasion assemblage in Lake Erhai, a subtropical lake southwestern China. Through cluster analysis and non-metric multidimensional scaling (NMDS), found significant shift: popula...

The Lhasa River is one of the five tributaries Yarlung Zangbo River. It main industrial, agricultural and animal husbandry area in Tibet. plays an important ecological security barrier role regulating regional climate maintaining biodiversity. In order to understand resource utilization ability relationship fish River, provide basic data for protection sustainable diversity fishery resources Se...

Prey individuals vary in their body size even within groups and are often scattered heterogeneously patchy environments. A foraging predator has to evaluate select the patches where it can maximize its energetic gains. We studied behavior of a (little egret, Egretta garzetta) hunting prey (goldfish, Carassius auratus) that differed composition across three different (one large, one mixed, small...

The goldfish (Carassius auratus) visual pathway displays continuous growth and plasticity throughout life. Since homeobox genes are important transcriptional regulators in development, we searched for homeobox genes in the adult goldfish retina and brain. Using the PCR, we discovered a repertoire of homeobox sequences expressed in these tissues. In addition to isolating homeodomain sequences fo...

Susceptibility of five species of Cyprinidae and Salmonidae freshwater fish to the early third-stage larvae (EaL3) and advanced third-stage larvae (AdL3) of Gnathostoma nipponicum infection were examined. Two fish species inoculated orally with EaL3 were infected, and AdL3 were recovered from them with rate of 21.0% in Tribolodon hakonensis and 0.5% in Cyprinus carpio at 30 days postinoculation...

The authors measured the effects of centrally infused peptides on social approach behaviors in goldfish (Carassius auratus), a social teleost. Vasotocin (VT) inhibited approach responses toward the visual stimuli of conspecifics in the absence of aggressive or sexual olfactory contextual cues in males, and a V1 receptor antagonist stimulated such responses, at least in males that were not highl...