Rearing of fish
阅读：245发布：2022-08-12
专利汇可以提供Rearing of fish专利检索，专利查询，专利分析的服务。并且A method of rearing fish, particularly anadromous fish of the family Salmonidae in a captive environment. More particularly, rearing the young fish in fresh water and feeding them to appetite until they reach, and maintain for about two weeks, a Condition Factor, K, of at least 0.8; transferring the young fish directly from fresh water to natural tidal sea water, without acclimatisation in water of intermediate salinity; and, rearing the fish on an artificially administered diet for at least three months.，下面是Rearing of fish专利的具体信息内容。
1. A method of rearing anadromous fish of the family Salmonidae which comprises the steps of: i. rearing young salmonid fish in fresh water, having a salinity of less than 0.5 parts salt per 1,000, after hatching by feeding them regularly to appetite on an artificially administered diet so that they attain a Condition Factor of at least 0.8, said Condition Factor, K, being defined by the expressionK (w X 100)/l3 where w is the weight of the fish in grams and l its length in centimetres, ii. transferring the yound salomid fish after they have reached the smolt stage from said fresh water to natural tidal sea water, having a salinity of 30 to 35 parts salt per 1,000, without allowing acclimatisation in water of intermediate salinity, the smolt stage being that stage in their development where they would in their natural habitat migrate to the sea for the first time, and the Condition Factor of at least 0.8 having been attained at least two weeks prior to transferring them, and iii. rearing the smolts after transfer to said natural tidal sea water on an artificially administered diet for at least three months.
2. A method of rearing anadromous fish of the family Salmonidae which comprises the steps of: I. rearing young salmonid fish in fresh water, having a salinity of less than 0.5 parts salt per 1,000, after hatching by feeding them regularly to appetite on an artificially administered diet so that they attain a Condition Factor of from 0.9 to 1.2, said Condition Factor, K, being defined by the expression K w X 100/l3 where w is the weight of the fish in grams and l its length in centimetres, ii. transferring the young salomid fish after they have reached the smolt stage from said fresh water to natural tidal sea water, having a salinity of 30 to 35 parts salt per 1,000, without allowing acclimatisation in water of intermediate salinity, the smolt stage being that stage in their development where they would in their natural habitat migrate to the sea for the first time, and the Condition Factor of from 0.9 to 1.2 having been attained at least two weeks prior to transferring them, and iii. rearing the smolts after transfer to said natural tidal sea water on an artificially administered diet for at least three months.
3. A method of rearing anadromous fish of the family Salmonidae which comprises the steps of: i. rearing young salmonid fish in fresh water, having a salinity of less than 0.5 parts salt per 1,000, after hatching by feeding them regularly to appetite on an artificially administered diet so that they attain a Condition Factor of from 0.9 to 1.2, said Condition Factor, K, being defined by the expression K w X 100/l3 where w is the weight of the fish in grams and l its length in centimetres, ii. starving the young salmonid fish for from 1 to 2 days after they have reached the smolt stage, the smolt stage being that stage in their development where they would in their natural habitat migrate to the sea for the first time, and the Condition Factor of from 0.9 to 1.2 having been attained at least two weeks prior to the period of starvation, iii. transferring the young salmonid fish from said fresh water to natural tidal sea water, having a salinity of 30 to 35 parts salt per 1,000, without allowing acclimatisation in water of intermediate salinity, the transfer being performed immediately after said period of starvation, and iv. rearing the smolts after transfer to said natural tidal sea water on an artificially administered diet for at least three months.
4. A method of rearing anadromous fish of the family Salmonidae which comprises the steps of: i. rearing young salmonid fish in fresh water, having a salinity of less than 0.5 parts salt per 1,000, after hatching by feeding them regularly to appetite on an artificially administered diet so that they attain a Condition Factor of from 0.9 to 1.2 and an average weight of at least 30 grams, said Condition Factor, K, being defined by the expression K w X 100/l3 where w is the weight of the fish in grams and l its length in centimetres, ii. transferring the young salmonid fish after they have reached the smolt stage from said fresh water to natural tidal sea water having a salinity of 30 to 35 parts salt per 1,000 without allowing climatisation in water of intermediate salinity the smolt stage being that stage in their development where they would in their natural habitat migrate to the sea for the first time and the Condition Factor of from 0.9 to 1.2 and the average weight of at least 30 grams having been attained at least two weeks prior to transferring them, and iii. rearing the smolts after transfer to said natural tidal sea water on an artificially administered diet for at least three months.
5. A method of rearing anadromous fish of the family Salmonidae which comprises the steps of: I. rearing young salmonid fish in fresh water, having a salinity of less than 0.5 parts salt per 1,000, after hatching by feeding them regularly to appetite on an artificially administered diet so that they attain a Condition Factor of from 0.9 to 1.2 and an average weight of at least 30 grams, said Condition Factor, K, being defined by the expression K w X 100/l3 where w is the weight of the fish in grams and l its length in centimetres, ii. starving the young salmonid fish for from 1 to 2 days after they have reached the smolt stage, the smolt stage being that stage in their development where they would in their natural habitat migrate to the sea for the first time, and the Condition Factor of 0.9 to 1.2 and the average weight of at least 30 grams having been attained at least two weeks prior to the period of starvation, iii. transferring the young salmonid fish from said fresh water to natural tidal sea water having a salinity of 30 to 35 parts salt per 1,000 without allowing acclimatisation in water of an intermediate salinity the transfer being conducted immediately after said period of starvation, and iv. rearing the smolts after transfer to said natural tidal sea water on an artificially administed diet for at least three months.
6. A method according to claim 5, wherein the smolts belong to the genus Salmo.
7. A method according to claim 5, wherein the smolts are Salmo salar.
8. A method according to claim 5, wherein the smolts belong to the genus Oncorhynchus.
9. A method of rearing Salmo salar (Atlantic Salmon) which comprises the steps of: i. rearing young fish of the species Salmo salar in fresh water after hatching as alevins through the fingerling and parr stages by feeding them regularly to appetite on an artificially administered diet so that the parr attain a Condition Factor of at least 0.8, said Condition Factor, K, being defined by the expression K w X 100/l3 where w is the weight of the fish in grams and l its length in centimetres, the fresh water having a salinity of less than 10 parts salt per 1,000, ii. further rearing the parr in said fresh water by regular feeding to appetite until they smolt, iii. transferring the smolts from said fresh water to natural tidal sea water having a salinity of from 20 - 35 parts salt per 1,000 without first allowing the smolts to acclimatise in water of intermediate salinity, the Condition Factor of 0.8 having been attained at least two weeks prior to transferring them and the smolts being fed to appetite on an artificially administered diet for the greater part of said two weeks, and iv. rearing the smolts after transfer to the natural tidal sea water on an artificially administered diet for at least three months.
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