Predicting Feed Intake of Food-Producing Animals (1987) / Chapter Skim
Currently Skimming:
2. Fishes
2. Fishes
Pages 16-24
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 16... ...
Little basic research into the environmental, physiological, and dietary factors that affect feed intake in fishes has been accomplished, despite the modest amount that has been published on the nutritional requirements of fishes (NRC, 1981, 1983~. Also surprising is the lack of scientific objectivity in the published research on estimates of food consumption of wild fish.
|
From page 17... ...
Food intake was adversely affected by sudden changes in salinity in either direction. MacLeod speculated that "the increased feed intake recorded in salinities from 7.5 to 28 %o could be exploited to increase the throughput of rainbow trout production in fish farming operations." Frequency of feeding is important; small trout are fed as often as 10 to 24 times per day (NRC, 19811.
|
From page 18... ...
They showed that feed intake and growth response occurred at the same ratio of food particle size to fish length, irrespective of family group. Since the general relationship between growth and this ratio was common to all groups tested, they concluded that "it was unlikely the relative effect of feed size was influenced by differences in the genetic background of the fish." The amount of food eaten in a day is often expressed as a percentage of the body weight of the fish.
|
From page 19... ...
It is generally held that fishes eat to satisfy their energy requirements and that metabolizable energy is the main factor limiting feed intake (NRC, 1981, 1983; Bromley and Adkins, 19841. Food Particle Size and Composition Feed intake and growth rate have been shown to be closely related to food particle size (Wankowski, 1977; Wankowski and Thorpe, 1979~.
|
From page 20... ...
Mixtures of amino acids were effective feeding stimulants for rainbow trout (Aaron and Mackie, 1978~. Rainbow trout that were trained to use demand feeders showed a marked preference for a diet that contained all synthetic amino acids and that simulated the amino acid profile of squid muscle over a plain casein diet with an amino acid profile based on known requirements.
|
From page 21... ...
6 2.9 2.8 2.7 2.6 2.3 2.1 1.9 1.6 1.5 1.3 1.2 1.1 1.0 0.8 3.4 3.3 3.0 2.8 2.6 2.3 2.0 1.7 1.6 1.4 1.3 1.2 1.1 0.9 3.7 3.6 3.3 3.0 2.8 2.5 2.1 1.8 1.7 1.5 1.4 1.3 1.2 1.0 9 3.9 3.8 3.6 3.2 3.0 2.8 2.4 1.9 1.8 1.6 1.5 1.4 1.3 1.0 10 11 12 4.6 4.8 5.2 4.4 4.7 4.9 4.1 4.5 4.8 3.9 4.0 4.6 3.6 3.8 4.3 3.3 3.6 3.7 2.7 2.9 3.0 2.0 2.1 2.4 1.8 1.9 2.0 1.7 1.8 1.9 1.6 1.7 1.8 1.5 1.6 1.7 1.4 1.5 1.6 1.1 1.1 1.2 13 5.8 5.6 5.1 4.9 4.5 3.9 3.2 2.6 2.2 2.1 2.0 1.8 1.7 1.3 14 6.0 5.9 5.6 5.0 4.6 4.0 3.6 3.0 2.8 2.4 2.3 1.9 1.8 1.5 NOTE: Feeding rates are based on a single strain of rainbow trout fed dry diets containing digestible energy of approximately 3,000 kcal per kg (J.
|
From page 22... ...
for Rainbow Trout at Three Water Temperatures and Five Different Fish Sizes Calculated aHilton and Slinger (1981)
|
From page 23... ...
Effect of dietary protein level, and an anabolic steroid, ethylestrenol, on the growth, feed conversion efficiency and protein efficiency ratio of rainbow trout (Salmogairdneri)
|
From page 24... ...
The role of food particle size in the growth of juvenile Atlantic salmon (Salmo salar)
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.