Case 5; Fish - aantekeningen
20 important questions on Case 5; Fish - aantekeningen
What is the absolute fecundity?
(True or false) from the relation between food intake and growth for a fish species, we can deduce the food ration that gives optimal feed conversion
(true or false) after reaching maturity, fish still show significant body growth
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What can you tell me about the voluntary feed intake in fish?
-> Several neuropeptides, specific protein molecules, gastrointestinal peptides, hormones and blood metabolites operate the switch on-off mechanism of feed intake in fish
What can you tell me about the feed intake signalling molecules in fish?
1. Fish adjust the voluntary feed intake on their own time window depending on their physiological state, which is also affected by the quality of feed
2. The prevailing environmental/water conditions
What can you tell me about the gastrointestinal emptying rate?
the gastrointestinal motility also depends on the environmental factors
-> like the increase in water temperature increases the rate of evacuation
Name 5 environmental factors that affects feed intake in fish
2. Temperature
3. Salinity
4. PH
5. Ammonia
the impact of environmental factors on feed intake of fish is rather descriptive and lacks a conceptual mechanism
What is incipient dissolved oxygen (iDO)?
What is active metabolism (fish)
What is routine metabolism (fish)
What is the metabolic scope (fish)
metabolic scope = scope for activity within which fish must perform all activities including feeding to grow and reproduce
the absolute metabolic scope of fish can be constrained by anatomical, physiological and environmental factors
What is the oxygen limitation theoy?
The minimum concentration of water dissolved oxygen needed to meet the oxygen demand for feed inntake depends on?
- the nutrient profile of the diet (as indicated by the differences in the feed intake of rainbow trout between amino acid-balanced and amino acid-imbalances diets at hypoxic conditions)
The ripening cycle of the ovaries and testes of fish is related to?
What is a gonado somatic index (GSI)?
What type of signals from the environment can fish detect by the lateral line?
For which conditions or tasks is the lateral line more important than other sensory organs?
What specific function do the anal and dorsal fins have?
What specific function do the pelvic/ventral and pectoral fins have?
What specific function does the caudal fin has?
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