Pakistan Research Repository


Naich, Momin (1995) INFLUENCE OF ECTOPARASITES ON THE GROWTH OF SALMO GAIRDNERI (RICHARDSON). PhD thesis, University of Karachi, Karachi.



The Itchen Abbas and Romsey fish farms on the rivers Itchen and Test, Hampshire, U.K were selected for the investigation. Both farms are large intensive units specializing in producing rainbow trout Salmo gairdner (Richardson). 1,702 fish of age of O+ were examined during six intensive surveys between September 1986 and August 1988. The Madyan Trout farm on the river swat N.W.F.P was also selected for the comparison of parasitic prevalence found in Pakistan and Hampshire, U.K during the survey fifteen fish of age O+ were examined in May, 1992. The prevalence and intensity of the protozoan parasites Trichodina, Ichthyophthirius multifiliis, Costia necatrix, Chilodonella , sessile peritrichs and one monogenean Gyrodactylus were recorded at Itchen Abbas and Romsey fish farm. At Madyan trout farm on the river swat low parasitic prevalence was recorded as compaired to Itchen Abbas and Romsey fish farm on the river Itchen and Test. The majority of the parasitic were noted during the spring and summer periods. Parasitic abundance was high at higher temperatures. By using the analysis of covariance, the majority of with fish weight, length and condition factor (P>0.05). Both one-way and two way analysis variance revealed significant interactions between certain pairs of parasites in their effects on fish weight, length and condition factor (P>0.05). A log-logistic model also revealed significant relationships of the infection rate of certain parasites with both time and temperatures. Intensity of I. Multifiliis on the gills and density of Gyrodactylus infections in mucus shows significant relationships with time and temperature in some surveys by a simple regression analysis. Using a simple regression analysis it was evident infected groups have a significant relationship with age. However, there was very little difference between infected and uninfected fish, age especially where infected sample was big enough to be useful. The effect of chemicals used by the management were investigated during the surveys namely chloramines-T-for Furazolidone for gut infection and malachite green for Kidney infection. Other management parameters such as food consumption and feeds per day were recorded and related with other data

Item Type:Thesis (PhD)
Uncontrolled Keywords:ectoparasites, salmo gairdneri (richardson), rainbow trout, gyrodactylus spp, tricholdina spp, costia necatrix, ichthyophirius multifiliis, sessile peritrichs, chilodonella spp, fish growth, parasite
Subjects:Biological & Medical Sciences (c) > Biological Sciences(c1) > Paleo-zoology(c1.10)
ID Code:1139
Deposited By:Mr. Muhammad Asif
Deposited On:03 Jan 2007
Last Modified:04 Oct 2007 21:04

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