Effects Of Three Polyculture Models On The Growth And Hematology Indices Of Fish In Ponds Of Main Stocking Grass Carp

This dissertation was based on the concepts of physiological ecology of fish, and investigated the regulations of three polyculture models on growth of fish, tissue RNA DNA ratio, serum hormone levels and serum physiological and biochemical indices. This dissertation explored the regulation of growth of fish in different polyculture models, and the results as follow:There are significant effects on the growth of grass carp (GC), Ctenophaiyngodon idellus, in different polyculture models. The growth parameters of grass carp followed by GC-Ⅱ> GC-Ⅲ> GC-Ⅰ, specific growth rate (SGR) and serum insulin-like growth factor-Ⅰ(IGF-I) was highly extremely significantly correlated. The Viscerosomatic index (VSI) and white muscle RNA/DNA of GC-Ⅲwere highest. There were no significant effects on serum growth hormone (GH), and most of serum biochemical parameters of grass carp in different polyculture models.3,5,3’,5’-tetraiodothyronine (T3) of GC-Ⅰwas significantly lower than GC-Ⅱand GC-Ⅲ.3,5,3 ’-triiodothyronine (T4)of GC-Ⅲwas significantly higher than GC-Ⅰand GC-Ⅱ. Cholesterol (CHOL) and high density lipoprotein cholesterol (HDL-C) of GC-Ⅲwas significantly lower than GC-Ⅰ. Serum glucose (GLU) of GC-Ⅰwas significantly lower than GC-Ⅱ. Glutamic oxalacetic transaminase (AST), glutamate-pyruvate transaminase (ALT), alkaline phosphatase (ALP) and lactate dehydrogenase (LDH) of GC-Ⅲwere significantly higher than GC-ⅠThere are significant effects on the growth of Silver Carp (SC), Hypophthalmichthys molitrix, in different polyculture models. The growth parameters of Silver Carp followed by SC-Ⅰ>SC-Ⅲ>SC-Ⅱ. SGR and serum IGF-Ⅰwas highly significantly correlated. There were no significant effects on VSI and serum T4 in different polyculture models. Variance analysis showed that serum GH of SC-Ⅰwas significantly lower than the SC-Ⅱ(P<0.05), serum IGF-I of SC-I was Significantly lower than the SC-Ⅲ(P<0.05), serum T3, white muscle RNA/DNA of SC-Ⅰwere significantly higher than that of SC-Ⅱand SC-Ⅲ(P<0.05). There were no significant effects on most of serum biochemical in different polyculture models. Total prootein (TP), triglyceride (TRIG), low density lipoprotein cholestrol (LDL-C), Creatinine (CREA) of SC-I were significantly higher than that of SC-Ⅱand SC-Ⅲ(P<0.05). GLU of SC-Ⅲwas significantly higher than the SC-I and SC-Ⅱ(P<0.05).There are significant effects on the growth of Big Head Fish (BH), Aristichthys nobilis, because of different polyculture models. The growth parameters of BH-II were higher than BH-Ⅰ. There were no significant effects on VSI, RNA/DNA, serum GH and T4 in different polyculture models. Serum IGF-I and T3 of BH-Ⅱwere significantly higher than BH-Ⅰ(P<0.05). Most of serum physiological and biochemical indices of BH-Ⅱwere higher than BH-Ⅰ.There were no significant differences on SGR of Paddlefish, Polyodon spathula, during experimental stage (P> 0.05). In weight and body length-related type of paddlefish, using the length from the edge of upper urano and the base of tail fine as body length was more reliable. Most of the serum physiological indices of Paddlefish are lower than that of other teleosteans. The total protein concentration (TP) and CHOL in serum had significantly correlation to SGR (P< 0.01). TP, globulin (GLB) and CHOL also significantly correlated to the growth rate (P< 0.01).From the growth of filter-feeding fish in three polyculture models, daily gain per uint area of modeⅡwas biggest. That had a faster material circulation and energy conversion efficiency bringing higher eco-efficiency in this model.