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Broodstock development, induced breeding and larval rearing of Indian pompano, Trachinotus mookalee, (Cuvier, 1832) – A new candidate species for aquaculture

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Relation http://eprints.cmfri.org.in/12912/
https://doi.org/10.1016/j.aquaculture.2018.06.039
 
Title Broodstock development, induced breeding and larval rearing of Indian
pompano, Trachinotus mookalee, (Cuvier, 1832) – A new candidate species
for aquaculture
 
Creator Ranjan, Ritesh
Megarajan, Sekhar
Xavier, Biji
Ghosh, Shubhadeep
Santhosh, B
Gopalakrishnan, A
 
Subject Farming/Culture
Induced Breeding
 
Description The present study describes the first trial on broodstock development, induced breeding and larval rearing of
Indian pompano, Trachinotus mookalee. Indian pompano fingerlings were collected from wild and raised to adults
having an average size of 2.84 ± 0.10 kg weight and 47.6 ± 1.43 cm length. These adult fishes were stocked in
125 t capacity circular tank having re-circulatory facility for broodstock development. The fishes were fed with
squid along with clam meat and matured in four months. Mature females with>500 μm ova and oozing males
were selected in the ratio of 1:2 (female:male) and were induced with single dose of hCG at the rate of 350 IU /kg
body weight. Three trials with same sex ratio and hormonal doses were tried. The fish spawned after 36–38 h of
induction at a temperature 29 ± 1 °C. Eggs were collected and treated with iodophore and stocked in 1 t FRP
tank for hatching. The eggs hatched out after 18–20 h of incubation at a temperature of 29 ± 1 °C. The overall
fertilization and hatching rate was found to be 69 ± 1.55% and 87.67 ± 0.81%, respectively. Larval rearing
was carried out in 2 t capacity fibre reinforced plastic (FRP) tanks using green water system. The newly hatched
larvae was 2.12 ± 0.02mm in total length, with an oval shaped yolk sac of 0.55mm2 and an oil droplet of
0.06mm2 in area. The mouth opening was formed 40–46 h post hatch with mouth gape measuring
228.10 ± 1.31 μm. A systematic and overlapping regime of live feed beginning from copepod nauplii, rotifer,
Artemia nauplii and artificial pellet were utilized during larval rearing. Weaning of larvae to inert diet was
started from 15th day post hatching (DPH) onwards. Larvae started metamorphosis by 17th DPH onwards and
was completed by 21st DPH, when the larvae reached 27.33 ± 0.10 mm. The larval rearing protocol resulted in
an average survival rate of 21.53 ± 1.45% till complete metamorphosis. The present study showed T. mookalee
to mature in captive conditions. The potential for induced spawning in captivity and larval rearing with a
survival rate of 21.53% makes Indian pompano an excellent candidate for mariculture. This forms the first report
of broodstock development, induced breeding and larval rearing of this species in captivity. The results of this
study would facilitate mass scale seed production of Indian pompano in captivity, which is essential for its
aquaculture.
 
Publisher Elsevier
 
Date 2018
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/12912/1/A%20Gopalakrishnan_2018_Aquaculture_Broodstock%20development%2C%20induced%20breeding%20and%20larval%20rearing%20of%20Indian%20pompano%2C%20Trachinotus%20mookalee%2C.pdf
Ranjan, Ritesh and Megarajan, Sekhar and Xavier, Biji and Ghosh, Shubhadeep and Santhosh, B and Gopalakrishnan, A (2018) Broodstock development, induced breeding and larval rearing of Indian pompano, Trachinotus mookalee, (Cuvier, 1832) – A new candidate species for aquaculture. Aquaculture, 495. pp. 550-557.