Fish Nutrient Requirements and Formulations
1. Nutritional requirements of farmed fish:
The optimal requirements of protein, fat, sugar and other main components in fish feed vary according to fish species, diet, different growth stages, water temperature, water quality and feeding and other technical factors.
2. Formula of compound feed for fish:
The following introduces several main fish feed formulations for readers' reference.
(1), herring formula feed: fish meal 35%, bean cake 47.5%, barley 15%, yeast 1%, mineral 1.5%, plus multivitamin, feed coefficient 2.26.
(2), grass carp and blunt snout bream formula: fish meal 5%, bean cake 33%, wheat bran 26%, starch Hawthorn 12%, pine needle powder 7%, mineral 2%, oil foot 1%, crude protein content 25%, feed coefficient 2.1.
(3) the formula of carp compound feed: mussel meal 5%, Peruvian fish meal 30%, bean cake 15%, wheat bran 40%, barley 10%, multi-dimensional mineral 1mi 2%, crude protein 28Mel 36%, feed coefficient 1.83%.
(4) the formula of tilapia compound feed: wheat bran 30%, bean cake 35%, fish meal 15%, corn meal 5%, locust leaf powder 5%, barley 8.5%, auxin 1%, salt 0.5%, crude protein content 34.6%, feed coefficient 2.03.
Formula: fish meal 50%, peanut cake 25%, peanut cake 25%, powder 12%, wheat bran 5%, fish oil 5%, vitamins 1%, minerals 3%.
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High-quality fish forage-- the key technique for high-yield cultivation of zedoary
Zedoary is an annual or perennial herb of the genus Asteraceae lettuce. It is rich in nutrients, and its crude protein content is 35% and 40% higher than that of Sudan grass, which is known as the "king of forage". The tender leaves of zedoary vegetables contain many carbohydrates, have good palatability, and the utilization rate is almost as high as 100%. It is an excellent green feed for fish. Zedoary vegetable is the best "green forage" for ryegrass and Sudan grass before the off-season and Sudan grass peak season. It can not only serve as the "staple food" of herbivorous fish, but also serve as a "delicacy" for cultivating green, grass, carp and other fish species. Cultivation characteristics
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Hairy crab
It belongs to asexual reproduction system. It is a national improved breed. Originated in Fumei Village, Anxi County, Fujian Province, it has a history of more than 80 years of cultivation. Morphological characteristics: shrub type, middle leaf, middle bud species. The plant has no obvious trunk and is divided into two parts. The spring buds germinated in late March, the peak period of one bud and three leaves was in the middle of April, and the 100 buds weighed 69 grams. The buds are thick and fluffy, the internodes are short, processed into green tea, the strips are tight, the buds are exposed, and the fragrance is mellow. The quality characteristics of fresh leaves with one bud and two leaves: tea polyphenols 20.1%, amino acids 3.0%, caffeine 4.0%, total catechins 158
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