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Causes of and Preventive Measures Against Winter Mortality of Fingerlings
According to available data, the average mortality rate of fingerlings caused by improper overwintering reaches 15% each year, with mortality in North China reaching as high as about 20%, and sometimes even exceeding 30%. The reduction in the number of fingerlings leads to insufficient stocking numbers the following year, directly
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Experience in Stocking Fingerlings for Tilapia Pond Aquaculture
1. Selection of fingerling size for stocking. Adult fish farming generally involves stocking in the same year and harvesting in the same year, so the fingerling stocking size is generally 3-10 cm, which gives a high fingerling survival rate, large marketable fish size, and high economic returns. At present, the fingerling sizes for tilapia farming in China mainly fall into three
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Feed Nutrition Requirements for Rainbow Trout Fry and Fingerling Farming
Based on the nutritional needs of rainbow trout as well as the raw material supply and cost conditions in developing countries, the United Nations Development Programme and the Food and Agriculture Organization proposed the following rainbow trout nutrition recommendations: the minimum protein requirement for rainbow trout fry and fingerlings is 36%; the calcium requirement is 1.0%-1.
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Detailed Explanation of Key Points on Pufferfish Pond Cultivation Techniques
I. Small-Size Fingerling Cultivation (I) Pond Selection Ponds require an abundant water source, unpolluted water quality, and small annual water temperature fluctuations. If brackish or freshwater aquaculture is used, ponds should be built in locations where water can be pumped conveniently, with short routes and low pumping heads. The pond bottom should be basically non-leaking,
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Key Technical Points for Fingerling Rearing in Carp Farming
Summer fry fingerlings must be selected from those that are disease-free and uninjured, robust in constitution, lively in movement, and uniform in size. Fingerling rearing generally adopts mixed culture of 2 to 3 species of fish, but with one species as the main one. In a pond with carp as the main cultured fish, stock 6,000 to 8,000 summer fry per 667 sq m, combined
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Prevention and Treatment of Complications Such as Enteritis and Gill Rot in Grass Carp Fingerling Culture
Symptoms The diseased fish swim slowly and have reduced appetite; the scales on the fish body are basically intact; there are one or several varying furuncles on both sides of the dorsal fin, which feel relatively soft to the touch and have a swollen sensation, and when the furuncles are cut open, purulent and bloody fluid flows out; the anus is slightly red and swollen; the gill filaments are red and swollen, with
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Aquaculture Measures to Improve the Survival Rate of Two-Year-Old Grass Carp Fingerlings
I. Main Reasons for the Low Survival Rate of Two-Year-Old Grass Carp Fingerlings 1. Pond not cleared or not thoroughly cleared before stocking Thoroughly inadequate pond clearing easily leads to poor pond bottom quality, with large amounts of pathogenic bacteria remaining on the pond bottom. When the weather is erratic as it has been this year and water quality is unstable, this will cause sporadic deaths of the fingerlings.
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Methods to Improve the Survival Rate of Grass Carp Fingerlings in Grass Carp Farming
Whether grass carp are raised in monoculture or in polyculture with grass carp as the main species, the water quality must be kept fresh. Feed mainly with green feed and supplement with concentrated feed. Concentrated feed includes bran, beans, and compound feed, etc. During the initial stage of stocking (within 15 days), summer fry should be fed some fresh and tender aquatic plants, such as duckweed and watermeal.
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Key Technical Points for Nursing Summer-Fingerlings of Freshwater Pompano
Freshwater pompano fry reared for about 20 days, with a body length of about 3 cm, are called summer-fingerling fish. The key nursing techniques at this stage are as follows: 1. Pond selection. The pond should have abundant water sources, good water quality free of pollution, good light, and convenient water intake and drainage, with a length-to-width ratio of 3:
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Key points for overwintering management in the fry and fingerling culture of freshwater pomfret
The freshwater pomfret is a tropical fish species. Its main suitable growth temperature range is between 21-32°C, with the optimum range at 28-30°C. At a water temperature of 16°C, the pomfret only begins to eat a small amount; at 12°C, the fish's balance becomes disturbed; and at 10°C, it causes death. During the overwintering process, water temperatures that are too low
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