A kind of spot snapper feed containing Ulva and preparation method thereof
A technology of spot snapper and feed, applied in the field of spot snapper feed and its preparation, to achieve the effects of reduced usage, high digestion and absorption rate, and comprehensive nutrition
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Embodiment 1
[0020] In order to detect the most suitable addition amount of Ulva, 0 (control), 5%, 10%, 15%, and 20% of Ulva dry powder were added to replace fish meal or other plant protein sources to make compound feed for spot snappers. Feed formula is as shown in table 1 (value is percentage by weight), and preparation steps are as follows:
[0021] ①Collect fresh Ulva, clean it, remove impurities, and dehydrate it with a centrifugal dehydrator. The speed of the centrifugal dehydrator is 3000-5000 rpm, and the centrifugal dehydration is 3-10 minutes.
[0022] ②Preparation of Ulva powder: put the dehydrated Ulva in a drying oven for drying, set the drying temperature to 70-85°C, and set the drying time to 4-5 hours, and control the moisture content of the dried Ulva to 10-15 %, and then pulverized to 80-120 mesh with a pulverizer, and set aside.
[0023] ③Mixing: according to the feed formula shown in Table 1, crush the bulk protein source raw materials and sugar source raw materials t...
Embodiment 2
[0027] In order to obtain the best feed formula containing Ulva star snapper, on the basis of Ulva content of 5%, the ratio of raw materials and auxiliary materials was adjusted to make different star snapper compound feeds. The feed formula is shown in Table 2 Show (numerical value is percentage by weight), preparation step is with embodiment 1.
[0028] Table 1
[0029]
[0030] Note: a. Tapioca starch is a commercially available product and can be purchased from the domestic raw material market;
[0031] b. The fish meal is American fish meal, with a crude protein content of 68% and a fish oil content of 9.4%;
[0032] c. Ulva powder protein content is 16.5%, crude fat content is 0.88%, crude fiber content is 6.89%, ash content is 21.89%; amino acid content (g / 100g, dry weight) is: threonine (Thr)*0.64, valerine Amino acid (Vla)*0.98, Methionine (Met)*0.22, Isoleucine (Ile)*0.61, Leucine (Leu)*1.32, Phenylalanine (Phe)*0.83, Lysine (Lys) *0.89, histidine (His) *0.21, ...
Embodiment 3
[0037] With the formulated feed prepared in Example 1, about 12 g of spot snappers were raised. Present embodiment is the net cage culture that fish raft is carried out in sea, and culture net cage is 1 * 1 * 1.5m, has cover net, in order to escape and waterfowl. Three parallel experiments were performed in each group, and 30 fish were tested in each parallel experiment. During the breeding period, the temperature was 20-26° C., and the salinity was 27-31 degrees. After 60 days of cultivation, various growth indicators were measured. The results of Example 1 are shown in Table 3.
[0038] table 3
[0039]
[0040] Note: The data are mean ± standard error; SGR: specific growth rate; in the peer data, those without the same lowercase letters indicate significant differences between each other (P<0.05)
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