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Spawning, embryonic development and larval culture of redhead dottyback Pseudochromis dilectus Lubbock, 1976 under captivity

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Relation http://eprints.cmfri.org.in/10772/
 
Title Spawning, embryonic development and larval culture of redhead
dottyback Pseudochromis dilectus Lubbock, 1976 under captivity
 
Creator Madhu, K
Madhu, Rema
Retheesh, T
 
Subject Induced Breeding
Ornamental Fishes
 
Description Reproductive behaviour, captive breeding, embryonic, larval development and suitable live feed for
Pseudochromis dilectuswere found out. Fishes ranging in total length 80–120mm(male) and 70–80mm(female)
were reared in FRP tank (1000-L) for six months to develop pairs. The pairs laid ball-shaped egg mass (25 to
35mmdiameter)which consisted of 400 to 500 spherical eggs/pair/spawning (n=18).The size of the individual
egg varied between 1743 and 1919 μm and all the eggs were interconnected by fine sticky threads. The egg ball
was white or transparent on the first and second day, black on 3rd day and silvery on 4th day of incubation. The
hatching rate varied between 91 and 95%, and the peak hatching took place under complete darkness on completion
of 96 h incubation. Total length of the newly hatched larvae varied between 5.1 and 5.3mmwithmouth gape
150 to 160 μm. First feeding started at 10 to 12 h after post hatch. The study concluded that Euplotes sp. (0 to
5 dph), enriched rotifer (6–15 dph) and microalgae enriched Diaphanosoma celebensis (16 to 30 dph) can be
used as effective feed for high survival of larvae of P. dilectus. On 20 dph the metamorphosis initiated and became
juvenile stage at 30 dph (82%). At 45 dph, all the larvae transformed to juvenile and shifted from pelagic to
epibenthic in the aquarium with denser body having reddish colouration.
Statement of relevance: Pseudochromis dilectus (Family: Pseudochromidae) is a species of keen interest in marine
aquarium trade and has distribution in the Western and Central Indian Ocean to Sri Lanka. As its males are
colourful than the female, males are selectively exploited fromthe nature for aquariumtrade which is also causing
threat to natural population thereby reducing its availability. Hence captive production is a potential solution
for reducing pressure on the natural stocks. However no scientific studies were conducted in P. dilectus with an
objective to captive breeding. Hence the present study was aimed to generate baseline information on its reproductive
behaviour, spawning, egg morphology, embryonic and larval development of P. dilectus and also to find
out suitable live feed for higher survivability of larvae, their metamorphosis and juvenile production under captive
conditions with a view to develop a reliable captive breeding and rearing techniques for its mass scale
production.
 
Publisher Elsevier
 
Date 2016
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/10772/1/Spawning%2C%20embryonic%20development_Pseudochromis%20dilectus_Aquaculture_459_2016.pdf
Madhu, K and Madhu, Rema and Retheesh, T (2016) Spawning, embryonic development and larval culture of redhead dottyback Pseudochromis dilectus Lubbock, 1976 under captivity. Aquaculture, 459. pp. 73-83.