The Effect of Sewage on Brown Trout {Salmo trutta L.)
نویسندگان
چکیده
منابع مشابه
Morphological differences in the skin of marble trout Salmo marmoratus and of brown trout Salmo trutta.
Despite being genetically very closely related, the marble trout Salmo marmoratus and the brown trout Salmo trutta exhibit marked phenotypic differences, particularly with regard to skin pigmentation. Histological analysis of skin from the head and gill cover of differently aged individuals of the two species was carried out in order to characterize differences in skin structure. The basic stru...
متن کاملThe effect of hypophysectomy and prolactin therapy on water balance of the brown trout Salmo trutta.
A technique for the hypophysectomy of the brown trout is described which might be applicable to other salmonids. Hypophysectomy produced a decrease in water turnover which was corrected by prolactin therapy. Hypophysectomy resulted in a decrease in the next flux of osmotic water. Both osmotic and diffusional water permeabilities were evenly decreased after hypophysectomy, such that the ratio of...
متن کاملInfluence of parental life history on maturation and smoltification in brown trout (Salmo trutta L.)
The developmental pathways of the offspring of three groups of trout, Salmo trutta L., with known life histories were compared: one group from a freshwater resident population and two groups from an anadromous population (fish that have smoltified and fish that have not). The fish were hybridized within a group, and 27 families were obtained and reared mixed in two tanks. Tracking fish specimen...
متن کاملThe Effect of Calcium Concentration of Water on Chloride Cell Density in Gill of Brown Trout (Salmo trutta L.) Larvae
The effects of the calcium concentration on chloride cell (mitochondria-rich cell) density in the gills of brown trout (Salmo trutta L.) larvae were studied. For this purpose, animals were divided into 3 groups 2 weeks after hatching and each groups was exposed to different calcium concentrations of water for two weeks. The results showed that the number of chloride cells in gill arch epithelia...
متن کاملThe growth of brown trout (Salmo trutta Linn.); the effect of temperature on the growth of two-year-old trout.
Temperature is a limiting factor in the distribution of many animals. The ova of brown trout (Salmo trutta) can develop without excessive mortality at water temperatures between 3 and 15° C. (Gray, 1928), while for adult trout, mortality is high above 20 and complete above 25 C. (Gardner & Leetham, 1914; Audige\ 1921; Gardner, 1926). It is generally assumed that temperature is the most importan...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 1935
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.12.1.1