Relationship between stock density and condition in tench (Tinca tinca) fry in polycultures with herbivorous fish
1998
Adamek, Z. (Jihoceska Univ., Pohorelice (Czech Republic). Vyzkumny Ustav Rybarsky a Hydrobiologicky)
The production results achieved in experimental pond polycultures of young tench (Tinca tinca) with silver carp (Hypophthalmichthys molitrix) or grass carp (Ctenopharyngodon idella) were processed. The regression analysis was used to find out how fish density expressed in different final survival rates at the end of the growing season affects tench weight and condition determinants. Tench were significantly negatively affected in condition as expressed by Fulton's (P0.05) and Clark's (P0.01) coefficients and in total protein content in blood plasma (P0.05). Hematocrit value and final individual weight decreased with increasing stock density but the effect was not significant. Determinants of biochemical composition (dry matter, ash, fat and crude protein contents) were not affected. No significant relationships (except for the dry matter in grass carp flesh) between these parameters were found in the two species of herbivorous fish tested.
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