Sex Hormones and their Effect upon Conditioned Responses in the Rudd (Leuciscus Leuciscus)

The pituitary in normal and parasitized roach, Leuciscus rutilus Flem.

Gonadogenesis in chub Squalius (Leuciscus) cephalus (L. 1758).

The chub is an opportunistic, rheophilic cyprinid species and popular gamefish distributed throughout almost all of Europe, South Caucasus and part of Anatolia. It is most abundant in small rivers and large streams. The process of anatomical and cytological differentiation was analyzed in chub gonads. Material used in the study was derived from artificial spawning of adult individuals caught in...

The effect of satiation upon conditioned and unconditioned salivary responses.

There is no doubt that the conditioned food saiivary reflexes are influenced by the intensity of hunger. However, there is no agreement as to whether this influence is direct or mediated by motor behavior. The data are also conflicting concerning the effect of hunger or satiation upon the unconditioned salivary response. Thus, Finch (1938) found that hunger affects the conditioned and unconditi...

Metal Concentrations in Chub, Leuciscus Cephalus, from a Submontane River

In many aquatic environments elevated levels of trace elements occur due to anthropogenic activities. Water organisms can be precise indicators in estimating the status of pollution of water environments. Among them several species of fish have been widely used (Håkanson 1984, Chevreuil et al. 1995, Andres et al. 2000, Falandysz et al. 2000, Perkowska and Protasowicki 2000, Řehulka 2001, Wagner...

the relationship between learners critical thinking ability and their performance in the reading sections of the tofel and ielts test

the study reflected in this thesis aims at finding out relationships between critical thinking (ct), and the reading sections of tofel and ielts tests. the study tries to find any relationships between the ct ability of students and their performance on reading tests of tofel and academic ielts. however, no research has ever been conducted to investigate the relationship between ct and the read...