Growth profiles of male Cyprinus carpio, 12 uninfected (healthy) and 12 infected with the crustacean Argulus indicus and associated fungus Saprolegnia sp. are presented. The fish were maintained under controlled conditions and provided with ad libitum food for 8 weeks. The instantaneous (G) and relative (h) rates of growth, and production (P) in uninfected carp (0.003 to 0.036 g.d-', 0.29 to 3.68%, 0.25 to 3.23 grespectively)weremuchhigherthan thoseofinfectedcarp( -0.007 too.021 g.d-',0.71 to 2.17x, 0.59 to 1.76 g). The condition factor (K) for uninfected carp was 4.5 to 4.8 compared to 2.6 to 3.0 for infected carp. During each of the 8 wk the weekly change in weight of infected carp was about 4% less than that of uninfected carp. These data show that Argulus-Saprolegnia infections significantly suppress carp growth and indicate that comparative growth rates can be used as indicators of parasite stress.
An investigation was made of the physical, chemical conditions of the water and substrate of nursery-cum-research-cum-rearing-cum-stocking ponds at Central Inland Fisheries Research Institute, Kamal. Temperature, pH, CO 2 , dissolved oxygen, chloride, phosphate, alkalinity, nitrates, organic matter, total solids, turbidity, electric conductivity, nitrogen, P 20 S , sand, silt, clay, Caco l , etc. were measured monthly. Statistical analysis of these factors showed some significant correlations. The phyto-and zooplankton were also sampled and the seasonal changes in abundance recorded.
This communication records eight ectoparasites of the gills and skin from edible freshwater fishes of Haryana. Since all eight parasites collected differ from those described earlier in the literature, they are briefly redescribed and arranged systematically.
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