By Robert G. Piper
Released in North and crucial the US via the yankee Fisheries Society. to be had completely from CABI Publishing in all different territories of the world.Second variation of a number one fish tradition manualRelevant for either inner most and public fish cultureVital as a coaching instrument and as an afternoon to day hatchery resourceThis moment variation expands and updates the unique Fish Hatchery administration, the
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Extra resources for Fish Hatchery Management
Example text
Various types of egg incubation are described in detail in Chapter 3. Rearing Facilities Rearing units for intensive fish culture include starting tanks or troughs for swim- up fry, intermediate rearing tanks for fingerlings, and large outdoor rearing ponds or raceways. Rearing units should be constructed so they can be drained separately and quickly. They should be adequate not only for the normal operating flow in the hatchery but also for increased volumes of water needed during draining and cleaning of the facilities.
Freshwater fishes take water and very actively excrete large amounts of water in the form of urine from the kidneys. Salinity and dissolved solids are made up mainly of carbonates, bicar- in bonates, chlorides, sulphates, phosphates, and possibly nitrates of calcium, magnesium, sodium, and potassium, with traces of iron, manganese and other substances. Saline seepage lakes and many impounded waters situated in arid regions with low precipitation and high rates of evaporation have dissolved solids in the range of 5,000-12,000 parts per million.
Topography V C W Sufficient elevation between water source and aeration and gravity gentle slopes or facilities for production Land should have flow. moderate be graded to proAvoid areas subject that can relief vide adequate drainage. to flooding. Water supply Source T C 1 he water supply should be considered in this W order of river; lake preference: or stream; well; spring; An underground reservoir. water source should be investigated. Lake or reservoir water preferred over creek or stream supply.