China has a large amount of salmon fry, a wide range of enactment and a longer seedling period. As far as the area is concerned, there are almost all of salmonids distributed from the south to the Beibu Gulf and north to the Bohai Bay. Calyx spawns in the natural sea area every autumn and winter. When the hatched larvae grow to 13°C in early spring, they begin to swim to the shallow waters in the coastal waters. At this time, seedlings are formed. Due to the influence of natural factors such as water temperature, tides, and geographical environment, the phenomenon of late growth in the south and late in the north is shown in the seedling stage in China.
Table Map of China's coastal eel fry during the seedling stage of the seedling stage of the seedling stage during the booming stage of Guangxi coastal from early January to late April to mid-January to the end of February Guangdong coast to the end of January to early April to mid-February to mid-March Zhejiang coast from early March to April From late March to late April in the coastal area of ​​Shandong Province from early April to mid-May to mid-April to early May
Note: Due to the influence of climate, sea conditions and other conditions, it will be early and late for the seedlings in various regions. This table is for reference only.
It is advisable to catch the eel fry early, and early catching of low temperature is beneficial to the fishing and transport, and it can be stocked earlier to prolong the effective breeding time. Miaomiao on the sea should choose good wind and warm weather, avoid rain and fog or north wind weather to catch the seedlings, it is best to just rain in the upper reaches, the outflow of fresh water in the estuary or catch the seedlings when the wind rises, so When the eel fry were concentrated in the shallow waters of the estuary for food, the effect of concentrated catching was best at this time.
Fishing tools:
There are many tools for catching eel fry. At present, there are commonly used fences, long-handling fishing seas, push nets, board nets, and gate nets.
(1) Rectangular fence
The net body is rectangular, 30 meters long and 2-4 meters wide. The net is made of 11-12 mesh nylon net. The lower part of the net is a sinker. The upper runner is a foam floater. There are 20-30 meters long drawstrings at both ends. It takes more than one person to pull the net during operation. The faster the net speed is, the more the number of seedlings will be caught. When closing the net, the operator should step on the bottom outline separately to avoid the fish fleeing from the bottom of the net. When the fish fry left on the nets are found, they should shake off the water in time to avoid leaving the water for too long and die. At the end of collecting the net, the fish fry should be picked up into the loading container as soon as possible, and the wild fry should be picked and held for oxygenation.
(2) Long handle fishing sea
The net diameter of the fishing net is 50-80 cm, and the net body is made of 30-40 mesh nylon or polyethylene material. When operating, one person holds the net and fishes back and forth. When catching the seedlings with the sea, the caught fish should be put into the seedling barrel in time to avoid repeated abrasions.
(3) Zha Zhang Network
Sluice nets are generally installed on the gates of shrimp farms or salt ponds. The net is self-tapering, 5-7 meters long, the net is 30-40 mesh nylon mesh, the net mouth is rectangular, the size is the same as the gate size, it is fixed on the gate frame, the net bottom has about 50 centimeters of opening, usually use The rope is tight. When the shrimp pond or the salt pond enters the water, the fish fry enters the net with the water, and the net tie rope is unwrapped at a certain time and the fry is poured into the seedling barrel.
Table Map of China's coastal eel fry during the seedling stage of the seedling stage of the seedling stage during the booming stage of Guangxi coastal from early January to late April to mid-January to the end of February Guangdong coast to the end of January to early April to mid-February to mid-March Zhejiang coast from early March to April From late March to late April in the coastal area of ​​Shandong Province from early April to mid-May to mid-April to early May
Note: Due to the influence of climate, sea conditions and other conditions, it will be early and late for the seedlings in various regions. This table is for reference only.
It is advisable to catch the eel fry early, and early catching of low temperature is beneficial to the fishing and transport, and it can be stocked earlier to prolong the effective breeding time. Miaomiao on the sea should choose good wind and warm weather, avoid rain and fog or north wind weather to catch the seedlings, it is best to just rain in the upper reaches, the outflow of fresh water in the estuary or catch the seedlings when the wind rises, so When the eel fry were concentrated in the shallow waters of the estuary for food, the effect of concentrated catching was best at this time.
Fishing tools:
There are many tools for catching eel fry. At present, there are commonly used fences, long-handling fishing seas, push nets, board nets, and gate nets.
(1) Rectangular fence
The net body is rectangular, 30 meters long and 2-4 meters wide. The net is made of 11-12 mesh nylon net. The lower part of the net is a sinker. The upper runner is a foam floater. There are 20-30 meters long drawstrings at both ends. It takes more than one person to pull the net during operation. The faster the net speed is, the more the number of seedlings will be caught. When closing the net, the operator should step on the bottom outline separately to avoid the fish fleeing from the bottom of the net. When the fish fry left on the nets are found, they should shake off the water in time to avoid leaving the water for too long and die. At the end of collecting the net, the fish fry should be picked up into the loading container as soon as possible, and the wild fry should be picked and held for oxygenation.
(2) Long handle fishing sea
The net diameter of the fishing net is 50-80 cm, and the net body is made of 30-40 mesh nylon or polyethylene material. When operating, one person holds the net and fishes back and forth. When catching the seedlings with the sea, the caught fish should be put into the seedling barrel in time to avoid repeated abrasions.
(3) Zha Zhang Network
Sluice nets are generally installed on the gates of shrimp farms or salt ponds. The net is self-tapering, 5-7 meters long, the net is 30-40 mesh nylon mesh, the net mouth is rectangular, the size is the same as the gate size, it is fixed on the gate frame, the net bottom has about 50 centimeters of opening, usually use The rope is tight. When the shrimp pond or the salt pond enters the water, the fish fry enters the net with the water, and the net tie rope is unwrapped at a certain time and the fry is poured into the seedling barrel.
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