Question

scientific name of rohu and give the development of stages of it​

Answer 1

Answer:

mark me as brainliest

Explanation:

Labeo rohita (rohu)

3. Results

3 .1. Embryonic development

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The fully swollen eggs measured between 4·25 and 5·31 mm in diameter, with

an average of 4·83 mm. The details of embryonic development of the hybrid

are presented in table 1 and figure l(a) to (m).

3 .2. Larval development (figure 2a)

The just hatched larva is transparent and devoid of mouth. Eyes are pigmentless,

The yolk-sac has two portions, anterior short bulbous portion and posterior

elongated portion. Myotomes, 27 + 10. Total length 4·20 mm.

6 hr old hatchling (figure 2b)

The constriction between the bulbous portion and the elongated portion of the

yolk-sac disappears. Two auditory concretions are clearly seen, the posterior

one being slightly larger. Total length 4·44 mm.

12 hr old hatchling (figure 2c)

Eyes slightly pigmented at the centre. The bulbous portion of yolk-sac is reduced

in height. Myotome.j Z? + 14. Pectoral fin bud appears. Notochord is seen as

a spotted line. Total length 4·82 mm.

24 hr old hatchling (figure 2d)

Eyes become more pigmented, particularly at the centre. Mouth appears as a

slit. Yolk-sac gets elongated. A reddish hue is seen near the opercular region.

Total length 5 '11 mm,

48 hr old hatchling(figure 2e)

Mouth opens. Air-bladder is seen. Pectoral fin is more prominent. Intestine

is visible. Gill arches are seen as lines. Ventral fin-fold starts from about the

middle region of air-bladder. Dorsal fin-fold starts immediately after the airbladder. Caudal is nearly round with five striations. A few chromatophores

appear on the head. Total length 5·44 mm.

72 hr old hatchling (figure 2f)

Yolk-sac almost completely absorbed. Mouth well-developed. Number of

chromatophores on the head region increases. Operculum appears covering the

gill-arches. Air-bladder elliptical in shape. Notochord clearly seen with the

posterior end slightly upturned. Eight striations are present on the caudal fin.

A few chromatophores are seen around the tip of the notochord, Myotomes,