1. Body shape: the bass is medium-sized, with a long and laterally flattened body, a slightly bulging back, a more rounded belly, a greenish-gray back, a silvery-white belly and sides of the body, and black spots on the upper sides of the body and the dorsal fins.2. Scales and fins: the whole body is covered with fine scales, and 2 dorsal fins, the first one of which is harder (12 hard spines) but relatively small, while the second one is softer (1 hard spine and 11-13 soft fins) but relatively large. 2 dorsal fins, the first dorsal fin is harder (12 hard spines and 11-13 soft spines) but relatively smaller, while the second dorsal fin is softer (1 hard spine and 11-13 soft spines) but relatively larger. The caudal and pectoral fins are shorter.

I. What does a bass look like

1. Body shape

(1) The body is of average size, with a long, laterally compressed, thick body, slightly bulging back, and a more rounded belly.

(2) The head is medium-sized, slightly pointed, with the lower jaw slightly protruding from the upper jaw, the upper jaw extending below the posterior margin, and both jaws, the plastron, and the orofacial skeleton have tiny teeth.

(3) The dorsum is greenish gray, while the abdomen and sides of the body are silvery white, with black spots on the upper sides of the body and dorsal fins, which diminish with age.

2. Scales and fins

(1) The whole body is covered with tiny scales.

(2) 2 dorsal fins, of which the first dorsal fin is mainly 12 hard spines, hard, almost sticking to the back, but relatively small, while the second dorsal fin is mainly 1 hard spine and 11-13 soft fins strips, softer, but relatively larger.

(3) The anal fin is mainly 3 hard spines and 7-9 soft fin strips.

(4) The caudal and pectoral fins are relatively short.

Second, the bass breeding environment

1, pond treatment

(1) Before stocking the fry, the water in the pond is drained and then exposed to the sun for a period of time.

(2) After the end of the sun, about 15 days before stocking seedlings, use 50kg of quicklime per mu of pond to disinfect the pond.

(3) After disinfection, apply 3kg of compound fertilizer per mu of pond to fertilize the water, when the water quality is slightly green or slightly brown.

2, water conditions

(1) Water depth of 1.5m or more, good water quality, no pollution.

(2) The salinity of the water body is controlled below 5? If the salinity of the water body is too high, it will lead to a decline in the growth rate of bass.

(3) Oxygen dissolved in the water body is kept above 5mg/L.

(4) The transparency of the water body is maintained at about 30-40cm.

(5) The appropriate temperature range is 7-30 ℃, 18-22 ℃ is more appropriate.

(6) Every 15 days or so to inject water, each time into the new water 10-20cm.

(7) Regular water changes, each time the amount of water should not be more than one-third.

3, the depth of the water level

(1) During the period of March to May, the depth of the water level is controlled at about 1-1.2m.

(2) During June-August, the depth of water level is controlled at about 1.5-2m.

(3) During September-November, the depth of water level is stabilized at about 1.5m.