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Title of Thesis

Momin Naich
Institute/University/Department Details
Department of Zoology/ University of Karachi
Number of Pages
Keywords (Extracted from title, table of contents and abstract of thesis)
ectoparasites, salmo gairdneri (richardson), rainbow trout, gyrodactylus spp, tricholdina spp, costia necatrix, ichthyophirius multifiliis, sessile peritrichs, chilodonella spp, fish growth, parasite

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

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3476.98 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
123.23 KB
2 1 Introduction 1
250.37 KB
  1.1 Gyrodactylus Spp 2
  1.2 Tricholdina Spp 5
  1.3 Costia Necatrix ( Ichthyobodo Necator ) 7
  1.4 Ichthyophirius Multifiliis 9
  1.5 Sessile Peritrichs 12
  1.6 Chilodonella Spp 15
  1.7 Growth Of Fish 17
  1.8 Water Temperature 19
  1.9 Chemical Treatment 20
  1.10 The Aims Of This Investigation 22
3 2 Materials And Methods 25
138.88 KB
  2.1 Fish Farms Used In The Study 25
  2.2 Collection Fish Samples 28
  2.3 First Survey, At Itchen Abbas September To December 1986 28
  2.4 Second Survey, At Itchen Abbas January To May 1987 31
  2.5 Third Survey, At Itchen Abbas , April To August To July 1987 32
  2.6 Fourth Survey, At Itchen Abbas , April To July 1998 33
  2.7 Fifth Survey, At Romsey April To August 1988 34
  2.8 Sixth Survey, At Romsey July To August 1988 34
  2.9 Seventh Survey, At Madyan , May 1992 35
  2.10 Statistical Analysis 35
4 3 Results 39
961.71 KB
  3.1 Growth Rates Recorded In The Six Surveys 39
  3.2 First Survey, At Itechen Abbas September To December 1986 42
  3.3 Second Survey, At Itchen Abbas January To May 1987
  3.4 Third Survey, At Itechen Abbas April To July 75
  3.5 Fourth Survey, At Itchen Abbas , April To August 1988 90
  3.6 Fifth Survey, At Romsey Fish Farm, April To August 1988 108
  3.7 Sixth Survey, At Romsey Fish Farm, July To August 1988 125
  3.8 Seventh Survey At Madyan Fish Farm, May 1992 137
5 4 Discussion 139
1165.93 KB
  4.1 Introduction To The Discussion 139
  4.2 General Discussion Of The Survey At The Fish Farms 139
  4.3 Fish Growth 157
  4.4 Sampling Size 161
  4.5 Mucus Scraping And Post Mortem 165
  4.6 Parasite Types 166
  4.7 Host Responses Competition 205
  4.8 Interspecific Competition 211
  4.9 Chemical Treatment 214
  4.10 General Conclusion 215
  4.11 Areas And Suggestions For Further Investigation 221
  4.12 Summary 230
  4.13 Acknowledgements 232
6 5 Appendices 233
797.77 KB
7 6 References 323
453.34 KB