Recent Advances in Aquaculture: Volume 2 by Derek A. Robertson (auth.), James F. Muir, Ronald J. Roberts

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 couple of minutes, to supply readers with a moment quantity during this sequence, which has the sort of variety of excessive calibre examine and advancements to document. That the 1st quantity used to be so good acquired has been a resource of significant delight to the editors and supported their conviction as to the necessity for hyperlinks to hitch the examine laboratory to the fish farm via making present study on hand to a much wider variety of strength clients. during this quantity. now we have replaced the stability a bit in the direction of extra specialized topic parts. We make no apology for this. because the smooth aquaculture expert is worried with quite a lot of specialisms in the broader content material of administration and construction, and there's each have to current such paintings in a suitable layout. moreover lots of those specialized themes have a value correct around the variety of construction, are frequently economically severe and are for that reason of con­ siderable and frequent significance. the 1st contribution. by means of Dr Derek Robertson, supervisor of the Institute of Aquaculture's Howietoun Fish Farm, covers simply this type of subject.

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Recent Advances in Aquaculture: Volume 2

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Subsequently, in the case of the female, connective tissue lamellae develop from this, into the substance of the gonad, as supports for the germinal epithelium cells and archigametocytes, and as the route for vascular development and diffusion of the nutrients required in such large amounts for oogenesis (Beach, 1959). Within the gonad the archigametocytes undergo bursts of rapid synchronous mitosis so that clusters of identical cells occur around each primordial archigametocyte. The archigametocytes are readily distinguished from somatic cells by their size (Kuznetsov, 1972).

Benisch (1936) suggested that at low pH destruction of the skin and gills occurs and thus probably facilitates invasion by the parasite although this now seems unlikely. The range of pH in which Ichthyobodo can survive is generally the same as the range reported for the survival of fish (Munro, 1978) and this is generally true of temperature also, and therefore it would seem that the parasite is adapted to the environmental conditions in which its host is living. It is likely that any major change from the normal will stress or debilitate the fish and thus facilitate lchthyobodo infestations.

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. (1894) Uber einen neuen Hautparasiten. Tetramitus nitschei and Goldfischen. Zeitschrift fur Bakteria, 16, pp. 25-30 Osborne, P. (1966) Effective chemical control of some parasites of goldfish and other pondfish. 1966 Annual Meeting of Wildlife Disease Association (unpublished), Catfisheries. Osage Beach, Mo. Quoted in Hoffman and Meyer (1974) Penso.

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