By Derek A. Robertson (auth.), James F. Muir, Ronald J. Roberts (eds.)

It is a tribute to the power of study and improvement in aquaculture that we're capable, in a comparatively short while, to supply readers with a moment quantity during this sequence, which has this type of range of excessive calibre learn and advancements to file. That the 1st quantity used to be so good obtained has been a resource of significant pride to the editors and supported their conviction as to the necessity for hyperlinks to affix the learn laboratory to the fish farm by means of making present examine on hand to a much wider diversity of capability clients. during this quantity. now we have replaced the stability a little bit in the direction of extra specialized topic components. We make no apology for this. because the smooth aquaculture specialist is worried with a variety of specialisms in the broader content material of administration and construction, and there's each have to current such paintings in an appropriate structure. moreover lots of those specialized subject matters have a importance correct around the variety of construction, are usually economically serious and are for that reason of con­ siderable and common significance. the 1st contribution. via Dr Derek Robertson, supervisor of the Institute of Aquaculture's Howietoun Fish Farm, covers simply this kind of subject.

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Arnold. London Moroff. T. (1904) Beitrag zur kenntnis einiger flagellaten. Archives Protistenk, 3, pp. 69--106 Munro. S. (1978) Infection and Epizootiology. I. ) Fish Pathology, Bailliere Tindall. London Musselius. A. and Strelkov. A. (1968) Diseases and control measures for fishes of fareast complex in farms of the USSR. Third symposium Comm. of Interna!. Epizoo!. Etudes Malades Poissons. Bulletin of the International Epidemiological Association, 69 - (7-8) pp. 1171-8 Nitsche. P. and Weltner, W.

Mature fish gather around the spawning area for sometime beforehand, and await the development of the ideal conditions for spawning. These may only occur once or twice in the spring season and usually comprise the precise mix of correct rising plane of water temperature, grassy, often freshly flooded, spawning ground, and a specific meteorological cue such as the arrival of a cold or warm front, or, possibly, rainfall or flood resulting in reduced ionic levels in the water. The optimum temperature is between 18°C and 22°C, although in colder areas, spawning may take place as low as 14°C, according to Martyshev (1973).

1974) Handbook of Trout and Salmon Diseases. A. (1979) Host Parasite Interactions between Ichthyobodo necator (Henneguy, 1883) and Farmed Salmonids. 1. , 2, pp. A. (1983) Host parasite interaction between Ichthyobodo necator (Henneguy. 1883) and farmed salmonids. PhD Thesis, University of Stirling, Stirling, 125pp. Robertson. I. and Bullock. M. (1981) Pathogenesis and Autoradiographic Studies of the epidermis of salmonids infested with Ichthyobodo necator (Henneguy. 1. Fish Dis. 4, pp. 113-25 Rogers.

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