Study On The Domestication Technology Of Sparus Macrocephalus And The Stability Design Of Maritime Domestication Equipment

The density of target fish species in marine ranches is an important criterion for the quality of ranching operations.Fish domestication technology and equipment are effective supports for increasing fish abundance.Taking the Sparus Macrocephalus,one of the main release targets in the East China Sea,as the research object,the research is conducted around three parts: pools,cages,and marine ranch.Pool domestication is different from traditional pool holding.In order to establish the conditioned reflex of Sparus Macrocephalus,domestication imprint learning based on sound was carried out in its infancy.Temporary cage culture allows the Sparus Macrocephalus to gradually adapt to the target sea area and reduce the stress response.In the part of marine domestication,the design of equipment functional structure aims to realize the unattended autonomous operation of equipment,which meets the requirements of domestication.At the same time,inspection and optimization of equipment stability were carried out to improve the reliability of equipment operation.The main research contents and results of this paper are as follows:(1)According to the actual needs of factory production mode and batch breeding and release,the overall domestication of Sparus Macrocephalus was studied,and an integrated domestication technology system were formed,consisting of three parts of pool domestication,cage temporary culture and continuous domestication at sea.In pool domestication,sound and pheromone bait are used as inducing factors to form Sparus Macrocephalus imprint learning and conditioned reflex domestication technical solutions based on the optimal sound frequency.The goal of temporary breeding in cages is to adapt to the sea environment and reduce stress.Marine domestication is supported by unmanned equipment to achieve continuous domestication.(2)According to the needs of the pool for temporary breeding,a 50000 L cylindrical pool was selected as the test pool in the Ningbo Ocean Fishery Science and Technology Innovation Base.According to the size of the pool,we designed and installed three wooden cages each,large and small,and equipped with cloud platform video equipment combined with water and underwater,selected water pumps and installed and debugged.After the commissioning,2000 Sparus Macrocephalus juveniles were selected to be placed in the pool,and the Sparus Macrocephalus domestication technical scheme developed was adopted for 21-day domestication.The results showed that the aggregation rate of Sparus Macrocephalus reached 89.25% after 4 days of domestication,and 90.06%after 6 days,which is more efficient than the existing sound domestication research results.(3)In order to achieve the goal of domestication at sea,unattended maritime domestication equipment is used to perform the domestication work.The functional design of marine domestication equipment mainly includes six basic modules of energy,bait,sound,floating body,control and stability support.According to the basic module,the upper support,floating body,and lower base of the domestication equipment are designed,and the hydrostatic check of the equipment is carried out.It is determined that the center of gravity of the equipment is 0.138 m,the center of buoyancy is 0.004 m,and initial stability height is 0.329 m,which satisfies a stable balance.condition.The designed domestication equipment has a high initial stability of more than 0.15 meters,which meets the design requirements.(4)Based on the structural design and static stability check of the marine domestication equipment,the hydrodynamic analysis considering the actual sea conditions of wind,wave and current is carried out to simulate the actual working dynamic response of the equipment at sea.Establish a hydrodynamic calculation model and simulate it through the hydrodynamic analysis software AQWA.The frequency domain analysis of the marine domestication equipment is carried out,and the hydrodynamic parameters of the marine domestication equipment in all directions are compared under the two situations of the loss and profit of the bin in the equipment.Through comparison,it can be found that the marine domestication equipment structurally meets the actual stability requirements,and there is no obvious difference between the two cases,indicating that the equipment design is more reasonable.(5)According to the actual water depth and wave conditions of Xiangshan Port marine ranch,further optimization design of marine domestication equipment is carried out,such as the selection of galvanized gearless anchor chain to improve the stability of equipment and the optimization of bin height.Combined with the extreme sea conditions in Xiangshan Port Area,the tensile force of anchor system of marine domestication equipment under the combined action of wind,wave and current along the same direction is calculated by using AQWA software.The result is far less than the tensile load of 70.76 KN,indicating that the selected anchor chain meets the demand.The change trend of the stability of the domestication equipment at sea before and after adding anchor system is analyzed.The results show that the anchor chain has a certain degree of angle limitation in the pitch direction,which indicates that the anchor chain has a certain degree of stability.The height of equipment bin is optimized by using the same sea condition.Eight sets of data of 80 mm,130 mm,180 mm,230 mm,280 mm,330 mm,380 mm and 430 mm are selected for hydrodynamic time domain analysis.The results show that the equipment can maintain excellent stability on the premise of further improving the functionality when the height of the bin is about 280 mm.