Materials and Methods Demonstration Breeding trials were conducted at the Heilongjiang Aquatic Technology Extension Station test site in Harbin, Heilongjiang Province. The experimental fishing ponds were three soil fishing ponds with a size of 5.0 mu (0.33 hectares) and an average water depth of about 1.5 meters. All ponds are equipped with water changing and aeration equipment.
The fish stock size of 0.06 g/tail released for testing was purchased from Heilongjiang Demonstration Fish Farm from Shanghai. The stocking density of herring in the three experimental fish ponds was 4000 fish per mu (or 60,000 tails per hectare), and it was also matched with the stocking of 1,000 tails per acre (15,000 pigs per hectare). The fish fry in the three fishing ponds are the same size and age. The target specification for herring culture is 60 g per tail.
When the herring are from 0.06 to 3 grams in size, they are fed with the American Soybean Association's 41/11 soybean meal-breaking fry feed. After 3g, they gradually switched to the American Soybean Association's 36/7 soybean to maximize fingerling feed. The fingerling feed is extruded floating pellet feed. Herring ration of 36/7 extruded feed was completed in 5 days. The size of the feed particle increases with the growth of the fish, and is maintained at about half of the time when the fish species is fully opened. The fish were fed 2 times a day and each time they were fed to a satiation. At the same time, the three ponds each had the same amount of feed. The feed was formulated by the American Soybean Association and produced by the Fushou Feed Factory in Xiamen, Fujian Province.
Due to the lack of water in Northeast China, the day-to-day management of aquaculture trials uses the American Society for Soybeans 80:20 pond culture model and zero water change culture techniques. On the same day of the month, all fishing ponds are sampled once. At the end of the test, all dry ponds in the fish ponds were counted and weighed. The average fish weight, gross and net yields, feed conversion factors and survival rates were calculated accordingly. During the trial period, record the cost of each farming investment and calculate the net income and investment return rate at the end of the trial.
Results From June 19 to September 25, 2004, herring were cultured for a total of 99 days and grew from 0.06 g/tail to an average of 37.4 g/tail. The average hair yield of herring and white plover was 141 kg/mu (or 2,115 kg/ha) and 25.4 kg/mu (or 381 kg/ha), respectively. The average survival rate of herring and white plover was 94.3% and 67.5%, respectively. The average feed conversion rate of herring on soybeans to maximize fry and fingerling feeds was 0.95:1.
When the herring species is priced at RMB 16.0/kg (or US$1.94/kg), and the white bream species is RMB 4.0/kg (or US$0.48/kg), the net farm income is an average of RMB 975/mu ($1,770 USD). / Hectare). The average return on investment for the three test pools was 70.5%.
Summary and conclusions The herring are actively consuming and exhibiting rapid growth in soy maximizing the expansion of buoyant fingerlings. The herring eatability is easy to acclimate and can be switched from broken feed to extruded feed within 5 days. The results of the aquaculture test show that the stocking density of herring in fingerling ponds can be significantly higher than that of 4,000 tails per mu cultivated in the demonstration and increase the aquaculture production by 2 to 2.5 times over the existing 141 kg/mu without affecting fishes. Grow. Increasing the stocking density of fish will further increase the economic return to breeding while optimizing the utilization of pond space. In 2004, farmed herring species in Harbin had better profits than farmed herring and mackerel, indicating that herring is a good breed suitable for feed farming in the region.
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