Altered physiology of rainbow trout in response to modified energy intake combined with pulp and paper effluent exposure.

摘要: Two experiments using rainbow trout (Oncorhynchus mykiss) were conducted to examine the combined effects of energy intake as manipulated by ration and pulp paper mill effluent exposure over either one, or two consecutive reproductive cycles. This study demonstrated that level affected full range measured parameters from allocation somatic growth gonadal development, steroid production hematology. Increasing expectedly increased growth, condition, liver gonad size. Female in higher treatments produced more follicles had larger eggs, investing same relative proportion total into ovarian development. Sex levels hematological also positively influenced increasing males females. By far, most dramatic impact reduced on reproduction was substantially reduce frequency sexually maturing fish. The not marked those linked typically did manifest unless fish exposed through physiological observed these consistent between herein, nor they with previously impacts similar this effluent. Effluent one cycle trout. However, when maintained cycles, a new pattern response emerged including condition factor both sexes, decrease potential ability blood females transport oxygen, sex steroids investment males. cause male years. size far obvious longer employed, thus, it appears take than year for changes be reflected particular endpoints.