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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 analysis and improvement in aquaculture that we're capable, in a comparatively little while, to supply readers with a moment quantity during this sequence, which has this kind of variety of excessive calibre learn and advancements to file. That the 1st quantity used to be so good acquired has been a resource of serious pride to the editors and supported their conviction as to the necessity for hyperlinks to affix the examine laboratory to the fish farm via making present learn on hand to a much wider variety of strength clients. during this quantity. now we have replaced the stability slightly in the direction of extra specialized topic parts. We make no apology for this. because the sleek aquaculture specialist is anxious 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 structure. moreover a lot of those specialized subject matters have a value correct around the variety of construction, are frequently economically serious and are hence of con­ siderable and common value. the 1st contribution. by way of Dr Derek Robertson, supervisor of the Institute of Aquaculture's Howietoun Fish Farm, covers simply the sort of subject.

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Functions and biota of the salmonid epidermis Proceedings of the Royal Society of Edinburgh, 79B, pp. 93-106 Pinto, C. (1928) Myxosporideous e outros protozoarios intestinaes de peixed observados na america do sol. Archivos do Instituto Biologica sas Paulo, 1, pp. 101-36 Plehn, M. (1924) Praktikum der Fischkrankheiten. E. Schweizerbarts' che verlagshandlung, Stuttgart. Germany. 179 pp. Reichenow, E. (1928) II. Teil. Specielle Natwgeschichte der Protozoen. Erst Halften: Mastigophoren und Rhizopoden in Dottlein.

Diameter of the oocyte: 350 to 600 p,m; that of the nucleus: 150 to 200 p,m. Vacuoles are arranged in two or three rows in the periphery of the oocyte. They fill the whole cytoplasm together with the growing yolk particles. The nucleus is still in the middle of the oocyte and contains a lot of nucleoli attached to the cell membrane. Diameter of the oocyte: 600 to 900 p,m; that of the nucleus is unaltered. At the end of this stage the cells have almost reached their definite size. Oocytes and the yolk particles hardly increase in size.

The gonads are reduced in size, congested, and contain numerous blood clots from capillaries ruptured during the exertions of spawning. After a few days abdominal wall contraction and tone is regained and the ovary assumes an earlier phase, in the carp this is typically between phase ii and phase iv depending on the stage of the spawning season and whether the carp is to spawn again in the near future. Visual examination of ovaries, using these criteria allows the practised eye a good degree of accuracy in defining their state of development.

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