GB 21045-2007Largemouth bass (English PDF)

3.1 Name

3.2 Alias

California perch.

3.3 Classification Location

4.1 External morphology

4.1.1 Outline

Body fusiform, side flat, back thicker. Gape large, oblique fissure, retractable jaw, maxilla extending posteriorly to the eye. Snout to the base of the caudal fin row Lash strip-shaped spots. Gill cover has a radial spots 3. Between dorsal fin spines and soft fin portion has a small notch; lateral line complete, along the body Central dorsal side and parallel to the rear end of a few stretching over the tail fin. The first outer gill arch gill rakers developed, shaped like a crescent-shaped, in addition to the back of the gill rakers, the other three Surfaces are covered with down jagged bone protrusion of the fifth gill arch bone degenerate into a short rod, no gill and gill rakers. Ctenoid body is small. Back to green Olive, yellow-belly white. Shallow concave caudal fin.

Largemouth bass shape shown in Figure 1.

Figure 1 largemouth bass outline drawing

4.1.2 Number of Characters

4.1.2.1 Fin

Dorsal fin. D. VIII ~ X, I-11 ~ 14.

Anal fin. A. III-9 ~ 12.

4.1.2.2 Lateral line scales

Scale formula. 55 7 ~ 914 ~ 17-A77

4.1.2.3 Gill rakers

The outside left of the first gill arch gill rakers. 6-7.

4.1.3 Measurable character

Artificial breeding conditions for the lower body length 223mm ~ 298mm, weight 305.2g ~ 662.8g individuals were found, which may be more than the amount of characters Values in Table 1.

Table 1 Measured measurable character ratio

Length/body height length/head length body length/caudal peduncle length body length/long tail height head/snout length head length/eye diameter head length/eye spacing caudal peduncle length/tail height 2.878 ~ ~ 3.4843.983 3.7172.879 9.9286.012 ~ ~ ~ 14.1032.975 ~ 5.4944.866 4.5701.063 6.7131.548 ~ ~ 2.348

4.2 Internal structural features

4.2.1 Swim bladder

A swim bladder chamber. Long cylindrical.

4.2.2 Teeth

Tapered serrations, sharper.

4.2.3 Vertebrae

Total spine. 30 to 32.

4.2.4 Peritoneum

Peritoneal white.

5.1 Growth

Artificial breeding conditions for the lower body length 106mm ~ 298mm, weight 24.2g ~ 662.8g individuals were measured, and its length and weight

Table 2.

Table 2 Found body length and weight

Length/mm

Range 106 ~ 147 223 ~ 278 264 ~ 298 Mean 127 ± 10.5 252 ± 15.2 276 ± 8.9 Weight/g the range of 24.2 - 66.9 305.2 662.8 ~ ~ 473 460 Mean 44.8 ± 10.5 398.3 ± 46.7 515.1 ± 48.5

5.2 Reproduction

5.2.1 The age of sexual maturity Artificial breeding conditions, females, males are 1+ age.

5.2.2 Spawner

Producing sticky eggs mature once a year, spawning a batch.

5.2.3 Fecundity

Absolute fecundity natural state. 4 × 104 Li ~ 10 × 104 tablets. Under conditions of artificial breeding broodstock individual fecundity in Table 3.

Table fecundity broodstock individuals under artificial breeding condition 3

Length/mm 223 ~ 298

Absolute fecundity/grain 51094 ± 18768 Relative fecundity/(grains/g) 123 ± 29