Embryonic and larval development of Pink ear emperor, Lethrinus lentjan (Lacepede, 1802) under captive conditions

Gomathi, P and Ramachandran, Siju and Anil, M K and Ambarish, Gop P and Surya, S and Raju, B and Raheem, P K and Ignatius, Boby and Gopalakrishnan, A (2021) Embryonic and larval development of Pink ear emperor, Lethrinus lentjan (Lacepede, 1802) under captive conditions. Aquaculture Research, 52 (7). pp. 1-13.

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    Abstract

    The present study provides the complete report on the embryonic and larval development of pink ear emperor, Lethrinus lentjan (Lacepede, 1802). Eggs were obtained from captive-reared broodstock of pink ear emperors from 1-year of age maintained in a 10-tonne recirculating aquaculture system (RAS). The brood fishes spawned throughout the year without hormonal induction. Fertilized eggs (692.65 ± 6.67 μm) were pelagic, transparent, non-adhesive and with a single oil globule measuring 146.63 ± 3.51 μm. Description of the different phases of embryogenesis, namely the zygote, cleavage, blastula, gastrula, segmentation of the fish is provided. Additionally, the developments during larval development period after hatching, which extends till the completion of yolk-sac absorption (pre-larvae) and the end of metamorphosis (post-larval) are also included in the present study. The embryonic development was completed within 14 h 40 min after fertilization. The newly hatched larvae had an average body length of 1.39 ± 0.08 mm, with a yolk sac measuring 787.67 ± 42.65 μm. The mouth opening was observed at 2 days post-hatch (dph). The yolk sac was completely absorbed by 2 dph, and the preflexion stage began, and it continued till 14 dph. Notochord flexion began by 15 dph and extended to 20 dph. The appearance of the typical adult colouration and scale formation started by 22 dph and by 35 dph the larvae reached the juvenile stage. The data on the embryonic and larval development will help to standardize the larval rearing techniques for the species.

    Item Type: Article
    Uncontrolled Keywords: embryonic development, larval development, lethrinidae, Lethrinus lentjan
    Subjects: Fish and Fisheries > Fish physiology
    Fishery biology
    Divisions: CMFRI-Vizhinjam
    CMFRI-Kochi > Mariculture
    Subject Area > CMFRI > CMFRI-Kochi > Mariculture
    CMFRI-Kochi > Mariculture
    Subject Area > CMFRI-Kochi > Mariculture
    Depositing User: Arun Surendran
    Date Deposited: 16 Jul 2021 06:35
    Last Modified: 23 Oct 2021 06:07
    URI: http://eprints.cmfri.org.in/id/eprint/15176

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