By Erlend Moksness; E Kjørsvik; Yngvar Olsen
Content material: 1. advent / The Editors -- 2. Abiotic elements / B.R. Howell and S.M. Baynes -- three. Microbial Interactions, Prophylaxis and ailments / O. Vadstein, T.A. Mo and O. Bergh -- four. reside meals expertise of Cold-Water Marine Fish Larvae / Y. Olsen -- five. Brood inventory and Egg creation / D. Pavlov ... [et al.] -- 6. From Fertilisation to the tip of Metamorphosis : practical improvement / E. Kjorsvik, ok. Pittman and D. Pavlov -- 7. First Feeding know-how / Y. Olsen, T. van der Meeren and K.I. Reitan -- eight. Weaning and Nursery / J. Stoss, ok. Hamre and H. Ottera -- nine. On-Growing to marketplace dimension / M. Jobling -- 10. The prestige and views for the Species / T. Svasand ... [et al.] -- eleven. Marine inventory Enhancement and Sea-Ranching / T. Svasand and E. Moksness -- 12. New Species in Aquaculture : a few uncomplicated monetary points / R. Engelsen ... [et al.]
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Extra resources for Culture of cold-water marine fish
The salts in the body fluids of fish are maintained by the osmoregulatory system at a concentration of about one-third of that of full-strength seawater. This differential means that fish in seawater passively lose water by osmosis through the gills and body surfaces, whilst salts enter the body. To maintain homeostasis, the fish has to drink seawater continually and excrete the excess ions. Specialised chloride cells in the gills remove ions such as sodium and chloride, while the kidneys produce small volumes of very concentrated urine.
This differential means that fish in seawater passively lose water by osmosis through the gills and body surfaces, whilst salts enter the body. To maintain homeostasis, the fish has to drink seawater continually and excrete the excess ions. Specialised chloride cells in the gills remove ions such as sodium and chloride, while the kidneys produce small volumes of very concentrated urine. u. are subject to the opposite fluxes: salts leave the body and water enters by osmosis. Fish that tolerate both environments are able to do so because chloride cells can take up monovalent ions to replace those lost, and the kidneys produce copious amounts of dilute urine to counteract the osmotic flux.
The temperature at which the maximum value in scope for growth is reached approximates to the optimum temperature for growth. The efficiency with which food is converted into growth very often increases as the temperature is reduced, and it is not uncommon to have an optimum temperature for feed conversion efficiency which is somewhat lower than the optimum for growth. Much of the published work in this area is for salmonids, but the relatively small amount of information for cold-water marine fish supports these generalisations.