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Growth and morphological development of laboratory-reared larval and juvenile climbing perch Anabas testudineus
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Growth and morphological development of laboratory-reared larval and juvenile climbing perch Anabas testudineus
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Growth and morphological development of laboratory-reared larval and juvenile climbing perch Anabas testudineus
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Journal Article
Growth and morphological development of laboratory-reared larval and juvenile climbing perch Anabas testudineus
2009
Overview
Morphological development, including fin and labyrinth organ, body proportions and pigmentation, in laboratory-reared larval and juvenile climbing perch Anabas testudineus was described and behavioral features under rearing condition were observed. Body lengths (BL) of larvae and juveniles were 1.9 +- 0.1 (mean +- SD) mm just after hatching (day-0), 8.7 +- 1.3 mm on day-19, reaching 18.4 +- 2.1 mm on day-35 after hatching. Aggregate fin ray numbers attained full complements in juveniles larger than 8.3 mm BL. Preflexion larvae started feeding on day-2 following formation of the upper and lower jaws, the yolk being completely absorbed by day-7 after hatching. Teeth appeared in flexion larvae larger than 5 mm BL on day-6, with cannibalism starting shortly after and continuing with further growth. Melanophores on the body increased with growth, a large dark spot developing on the lateral midline around caudal margin of the body in the postflexion and juvenile stages. The labyrinth organ differentiated in postflexion larvae larger than 7.2 mm BL on day-16, with air-breathing starting at the same time. Body proportions attained constant in postflexion larvae larger than 7.0 mm BL, and habitat of fish shifted from bottom to mid-layer. With the exception of fin ray numbers, the above morphological developments corresponded to behavioral shifts that occurred in the postflexion stage (ca. 7 mm BL), their subsequent continuity illustrating that the species possessed most juvenile-equivalent functions from ca. 7 mm BL.
Publisher
Springer Japan,Springer Nature B.V
Subject
/ Animal Systematics/Taxonomy/Biogeography
/ Biomedical and Life Sciences
/ Colour
/ Ecology
/ Eggs
/ EXPERIMENTACION EN LABORATORIO
/ EXPERIMENTATION EN LABORATOIRE
/ Fins
/ Fish
/ Fishing
/ GROWTH
/ habitats
/ Hatching
/ jaws
/ JUVENILE
/ Larvae
/ perch
/ rearing
/ Teeth
/ Zoology
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