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Fisheries
Hatchery systems
| Question | Answer |
|---|---|
| Aquaculture | Cultivation of aquatic organisms in water similar to agriculture on land |
| Hatchery | Controlled system for breeding and raising fish typically for stocking rather than profit |
| Fish propagation | Production of fish under controlled conditions to exceed natural output |
| Food fish focus | Emphasis on growth and energy conversion efficiency |
| Stocking focus | Emphasis on genetics and reproductive success |
| Flowing water system | System where water provides oxygen and removes waste but has low oxygen affinity |
| Ectotherms | Organisms whose body temperature and growth depend on environmental temperature |
| Growth limitation factors | Temperature oxygen waste density and food availability |
| Linear growth | Fish length increases at a constant rate before sexual maturity at constant temperature |
| Temperature units | Measure of growth potential based on temperature over time |
| Haskell principles | Set of rules describing growth feeding oxygen limits and waste relationships in fish culture |
| Food conversion | Amount of food required per unit of fish weight gain |
| Feeding rate equation | Formula used to calculate percent body weight to feed fish |
| Hatchery constant | Simplified constant representing feeding conditions assuming stable environment |
| Weight-length relationship | Fish weight can be estimated using w = KL³ |
| Condition factor (K) | Species-specific constant used in weight calculations |
| Dissolved oxygen | Amount of oxygen available in water for fish respiration |
| Henry’s Law | Gas concentration in water is proportional to its concentration in the atmosphere |
| Dalton’s Law | Total pressure equals sum of partial pressures of gases |
| Oxygen solubility | Decreases as water temperature increases |
| Aeration | Process of increasing oxygen levels in water |
| Aeration methods | Techniques like weirs cascades and splashboard systems to increase oxygen |
| Metabolic waste | Byproducts of fish metabolism including ammonia |
| Ammonia (NH3) | Toxic un-ionized form of nitrogen waste |
| Ammonium (NH4+) | Less toxic ionized form of nitrogen waste |
| TAN (Total Ammonia Nitrogen) | Combined concentration of ammonia and ammonium |
| Ammonia production equation | A = 56P used to estimate waste production from protein intake |
| pH effect on ammonia | Higher pH increases toxic NH3 levels significantly |
| Solids waste | Physical waste removed by settling or filtration |
| Mechanical filtration | Use of filters like sand filters to remove solid waste |
| Recirculating systems | Systems that reuse up to 90% of water with waste removal |
| Biological filtration | Process converting ammonia to nitrite and nitrate using bacteria |
| Nitrification | Conversion of ammonia to nitrite and then nitrate |
| Nitrosomonas | Bacteria converting ammonia to nitrite |
| Nitrobacter | Bacteria converting nitrite to nitrate |
| Brown blood disease | Condition caused by nitrite buildup reducing oxygen transport |
| Nitrification factors | Influenced by pH oxygen temperature and bicarbonate levels |
| Surface area in filtration | Increased area improves bacterial growth and filtration efficiency |
| Oxygen depletion cause | Result of fish respiration and waste accumulation |
| Growth prediction use | Allows calculation of weight feed needs and waste production |
Created by:
llamaandlearning
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