----Initial trials of carp culture in cages on the Yangtze River beach To explore ways to raise valuable aquatic products in river waters, to protect resources and to increase resources, we have conducted cage conservation in the Wailongwo waters of the Yangtze River in Wuhu. The preliminary test of fish is as follows.
1 The location of the Yangtze River Beach Wailongwo water area is larger, and the flood season can reach more than 10,000 mu, which is greatly affected by the wind. The cages were set up next to a treaty-wide reed belt 5 meters wide with reed bands as natural barriers. The depth of water is more than 10 meters, the water is smooth, and the transparency is more than 0.5 meters at the time of flat tide. The water is fresh and the dissolved oxygen is high.
2 The cage used for cage specifications is a rectangular box framed by bamboo. It is 7 meters long, 4 meters wide, 2 meters high and 56 cubic meters in volume. The mesh is a synthetic fiber with mesh size 2a = 1.7cm.
3 Fish fingerling test fish fingerlings were taken from fish caught by wild fish in natural waters. The scales of the fish were well-preserved, with a strong body and an average weight of 80 grams. The average body length was 18-19 centimeters and the average body height was about 5.5 centimeters. The specifications are basically the same.
The specific conditions for the release of fingerlings are shown in the table below:
(Units: grams, centimeters)
Mean tail weight average body weight average body length average body height
August 11 36 75 18.5 5.5
August 14 28 80 18 5.5
August 16 91 80 18 5.5
August 17 60 85 19 5.6
August 18 55 80 18 5.5
Total 270
Due to the high temperature during the release of the fish, the fish was not sterilized, and the salmon was ferocious, causing heavy fish injuries. In the three days of August 17-19, 149 died, accounting for 55.2% of the total fish species.
4 Feeding situation Salmon is a fierce fish with bait and shrimp. During the feeding period, the feed was a small, live, mixed-scented fish, consisting mainly of squid fish, and the amount was between 1 and 6.5 kilograms per day. During the whole breeding period, in August, a total of 44.45 kg was baited, in September a total of 65.75 kg was baited, and in October a total of 148.75 kg was baited and in November a total of 46.9 kg was baited. A total of 396.85 kg of small fish were fed during 141 days of feeding. The bait coefficient is 9.7.
5 When the harvest condition is harvested, the method of catching large and small remains is adopted and it is captured twice. For the first time, 52 tails were caught on October 23, weighing 17 kilograms and weighing an average of 335 kilograms. The second time, on December 30th, it was arrested, totaling 63, weighing 14.5 kg and an average weight of 230 g. The two codfish caught 115 tails with a total weight of 31.5 kilograms.
6 Benefit analysis survival rate. Due to our lack of experience due to the initial trial, 149 fish species died in the three days after their release. The fish species have not been supplemented in the future, thereby affecting the overall survival rate in the breeding process. 270 fish fingerlings were actually released and 115 were harvested. The total survival rate was 42.6%. After the fish species entered the box until August 19, there were 121 species of fish remaining and 115 were harvested. The actual survival rate was 96.2%.
Growth multiplier. The total net increase in meat is 1.5 times. The multiplying number of the actually fed fingerlings after entering the box is 3.5 times.
7 Problematic fish species were not selected when the temperature was low in the early morning, and the operation procedures such as weighing and measuring before the fish species were put into the box were not very detailed, and the fish species were not sterilized by drug dipping. For these reasons, 149 fish species were killed in the shortest 3 days after entering the cage. Affects the overall survival rate and the total net increase in meat. Due to the lack of experience in feeding and managing cages, in September, the meshes were blocked by moss for more than ten consecutive days, affecting the light conditions, flow conditions and dissolved oxygen conditions in the cages, thus affecting the growth rate of the experimental fishes. Improved during the test.
1 The location of the Yangtze River Beach Wailongwo water area is larger, and the flood season can reach more than 10,000 mu, which is greatly affected by the wind. The cages were set up next to a treaty-wide reed belt 5 meters wide with reed bands as natural barriers. The depth of water is more than 10 meters, the water is smooth, and the transparency is more than 0.5 meters at the time of flat tide. The water is fresh and the dissolved oxygen is high.
2 The cage used for cage specifications is a rectangular box framed by bamboo. It is 7 meters long, 4 meters wide, 2 meters high and 56 cubic meters in volume. The mesh is a synthetic fiber with mesh size 2a = 1.7cm.
3 Fish fingerling test fish fingerlings were taken from fish caught by wild fish in natural waters. The scales of the fish were well-preserved, with a strong body and an average weight of 80 grams. The average body length was 18-19 centimeters and the average body height was about 5.5 centimeters. The specifications are basically the same.
The specific conditions for the release of fingerlings are shown in the table below:
(Units: grams, centimeters)
Mean tail weight average body weight average body length average body height
August 11 36 75 18.5 5.5
August 14 28 80 18 5.5
August 16 91 80 18 5.5
August 17 60 85 19 5.6
August 18 55 80 18 5.5
Total 270
Due to the high temperature during the release of the fish, the fish was not sterilized, and the salmon was ferocious, causing heavy fish injuries. In the three days of August 17-19, 149 died, accounting for 55.2% of the total fish species.
4 Feeding situation Salmon is a fierce fish with bait and shrimp. During the feeding period, the feed was a small, live, mixed-scented fish, consisting mainly of squid fish, and the amount was between 1 and 6.5 kilograms per day. During the whole breeding period, in August, a total of 44.45 kg was baited, in September a total of 65.75 kg was baited, and in October a total of 148.75 kg was baited and in November a total of 46.9 kg was baited. A total of 396.85 kg of small fish were fed during 141 days of feeding. The bait coefficient is 9.7.
5 When the harvest condition is harvested, the method of catching large and small remains is adopted and it is captured twice. For the first time, 52 tails were caught on October 23, weighing 17 kilograms and weighing an average of 335 kilograms. The second time, on December 30th, it was arrested, totaling 63, weighing 14.5 kg and an average weight of 230 g. The two codfish caught 115 tails with a total weight of 31.5 kilograms.
6 Benefit analysis survival rate. Due to our lack of experience due to the initial trial, 149 fish species died in the three days after their release. The fish species have not been supplemented in the future, thereby affecting the overall survival rate in the breeding process. 270 fish fingerlings were actually released and 115 were harvested. The total survival rate was 42.6%. After the fish species entered the box until August 19, there were 121 species of fish remaining and 115 were harvested. The actual survival rate was 96.2%.
Growth multiplier. The total net increase in meat is 1.5 times. The multiplying number of the actually fed fingerlings after entering the box is 3.5 times.
7 Problematic fish species were not selected when the temperature was low in the early morning, and the operation procedures such as weighing and measuring before the fish species were put into the box were not very detailed, and the fish species were not sterilized by drug dipping. For these reasons, 149 fish species were killed in the shortest 3 days after entering the cage. Affects the overall survival rate and the total net increase in meat. Due to the lack of experience in feeding and managing cages, in September, the meshes were blocked by moss for more than ten consecutive days, affecting the light conditions, flow conditions and dissolved oxygen conditions in the cages, thus affecting the growth rate of the experimental fishes. Improved during the test.
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