Optimizing captive seed production technology of fanged seabream, Sparidentex jamalensis Amir et al., 2014

Suresh Babu, P P and Anuraj, A and Shilta, M T and Santhosh, B and Aneesh, K S and Dube, Praveen and Sonali, S M and Pal, Mahendra and Anjulekshmi, P and Ignatius, Boby and Suresh, V V R and Gopalakrishnan, A (2024) Optimizing captive seed production technology of fanged seabream, Sparidentex jamalensis Amir et al., 2014. Aquaculture, 592. pp. 1-13. ISSN 1873-5622

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Abstract

Successful captive seed production of the recently identified sparid, Sparidentex jamalensis, is a significant achievement for its farming and conservation. In each breeding attempt, a male with oozing milt was paired with a female freshly implanted with an LHRH-a pellet (100 μg LHRH Kg−1 of fish). Oocyte diameter of the selected female was ranging from 420 to 470 μm. The pair was maintained in a rectangular fibre reinforced plastic (FRP) tank (3000 L) adequately aerated from a single point aeration. Over three consecutive days, the fish spawned in batches, commencing from 42 h after pellet implantation. The daily spawning fraction of this multiple spawner ranged from 0.179 to 1.123 million per female. Among 18 attempts, successful spawnings were observed in 12 (66.7%) instances. Fertilisation rates ranged between 82 and 88%, with hatching percentages varying from 76 to 84%. The embryonic developmental phase spanned 17 to 22 h. At the pre-flexion stage [13 days post hatch (dph)], larvae measured up to 4.2 ± 0.18 mm, with notochord flexion initiating on 15 dph (8.45 ± 1.2 mm), accompanied by marked development in dorsal, anal, and caudal fins. Completion of fin ray formation and initiation of scale and lateral line development commenced on 30 dph (21.1 ± 0.3 mm) indicating the metamorphosis of larvae to juveniles. By 40 dph (28.46 ± 3.8 mm), the advance juvenile displayed fully formed fins, silvery scales and a distinct lateral line. Rapid developments in total length, body girth, mouth opening, and eye diameter were particularly noticeable as flexion development neared completion (15 dph). During larval rearing, three critical phases were observed: the period from mouth opening to first feeding (3 to 5 dph), the weaning period (25 to 30 dph), and the metamorphosis phase (35 to 40 dph), each exhibiting distinct mortality patterns. Initial swim bladder inflation was observed before 13 dph (4.2 ± 0.18 mm). Co-feeding copepod nauplii and rotifer (3 numbers mL−1 each) emerged as the ideal feeding strategy during the initial phase, significantly enhancing survival rates. The final larval survival at the end of metamorphosis on 40 dph ranged between 3.8 and 6.2%. Notably, natural light exposure, with a diurnal variation from 1000 to 4000 lx near the water surface, played a pivotal role in improving the initial larval survival.

Item Type:	Article
Uncontrolled Keywords:	Sparidae; LHRH-a; Critical period; Larval development; Metamorphosis
Subjects:	Fish and Fisheries > Fish breeding Aquaculture Aquaculture > Hatchery Demersal Fishes Eggs and Larvae
Divisions:	CMFRI-Kochi > Mariculture Division Subject Area > CMFRI > CMFRI-Kochi > Mariculture Division CMFRI-Kochi > Mariculture Division Subject Area > CMFRI-Kochi > Mariculture Division CMFRI-Mandapam
Depositing User:	Arun Surendran
Date Deposited:	01 Jul 2024 05:19
Last Modified:	23 Dec 2024 07:06
URI:	http://eprints.cmfri.org.in/id/eprint/18548

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