California Salmon Culture Technology

The use of cages in intensive fish farming for California salmon can bring significant economic benefits, and these cages can be placed in reservoirs, lakes, rivers, and ponds. This method allows for efficient fish production while making use of available water bodies. 1. Cage Setup and Placement The cages used are Lux-type double-layered nets with dimensions of 4m x 4m x 2m and a mesh size of 2.5cm. The net floats are made from bamboo, with the main lanes constructed using double rows of bamboo and the auxiliary lanes using single rows. Cages are spaced 2 meters apart to allow for proper water flow and reduce overcrowding. Each Shenzi (a type of weight) is a 1kg cement block, with 8 blocks per net. The bamboo frames are secured using 6 cement piers, each weighing 60kg. The cage area typically ranges between 16-30 square meters, depending on the needs of the operation. These cages can be installed in various water bodies, and they can be adjusted as water levels change to maintain a depth of more than 3 meters for optimal fish growth. 2. Breeding Methods (1) Single-cage Rearing: In this method, individual California salmon are kept in separate cages, and feed is provided regularly. This approach helps maximize yield by ensuring that each fish receives adequate nutrition. (2) Cage Nesting: Here, California salmon are raised alongside other species like maggots and squid. As the salmon grow, the bait species also increase in number, providing a natural food source. This system ensures that salmon have a steady supply of food without external interference. As the bait population decreases, the density of salmon can be managed to maintain a healthy balance. 3. Breeding Techniques (1) Site Selection: It's best to place cages in the middle and upper sections of rivers, near the reservoir’s living areas, or in deep lake regions. Avoid fast-flowing waters to prevent damage to the cages and stress on the fish. (2) Feeding Schedule: Fish should be introduced into the cages when the water temperature reaches at least 15°C. Earlier stocking increases growth time. When using bait such as oysters and squid, timing should align with the breeding cycles of these organisms and their availability. (3) Stocking Density: For pure California salmon cultivation, the recommended density is 20–25 fish per square meter. If other bait species are present, their density should be about 250–300 times that of the salmon. (4) Bait Management: The bait fish should be palatable and appropriately sized. If the bait is too large (more than 70% of the salmon’s length), it may be difficult for the salmon to swallow, causing feeding issues. Conversely, if the bait is too small, the feeding cost increases. Ideal bait size is 30–50% of the salmon’s body length. (5) Sorting and Cage Adjustment: Salmon grow at different rates, so regular sorting by size is essential. The first cage should have a mesh size of around 1 cm. Once salmon reach over 100 grams, they are moved to a second, larger cage for continued growth. (6) Daily Maintenance: Regular inspections are crucial. Clean the cages every 15 days to ensure good water quality and prevent blockages. Check for holes or damage and repair them promptly to avoid fish loss. During heavy rains, move cages to safer, ventilated areas. Disinfect seedlings before placing them in cages, and ensure that all feed is fresh and clean to prevent disease outbreaks.

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