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Captive spawning and embryonic development of marine ornamental purple firefish Nemateleotris decora (Randall & Allen, 1973)

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Relation http://eprints.cmfri.org.in/10771/
 
Title Captive spawning and embryonic development of marine ornamental
purple firefish Nemateleotris decora (Randall & Allen, 1973)
 
Creator Madhu, K
Madhu, Rema
 
Subject Induced Breeding
Ornamental Fishes
 
Description Courtship behaviour, captive breeding, embryonic and larval developments of Nemateleotris decora and its rearing
with suitable live feed were described. Different age groups (60–100 mm TL) were stocked (glass aquaria,
500 L) in outdoor transparent roofed hatchery at water temperature 29 ± 1 °C for pair formation. After 6 -
months of rearing, 4 pairs were formed. The size of the female ranged from 60 to 90 mm and males from 90 to
100 mm. Each pair was then stocked in 250-L perspex breeding tanks in the indoor breeding unit with a photoperiod
of 14 L: 10 D by a 40-Wbulb suspended at 20 cmabove the water surface. The environmental parameters
such as temperature, salinity, dissolved oxygen and pH, NO2, NO3 and NH3were maintained at suitable levels and
monitored once in 24 h. The pairs were daily fed with cooked meat of squid, shrimp, green mussel, raw fish egg
mass at 10% of their body weight in four split doses and live adult artemia (10–15 per day). The pairs began to
spawn after 6 months acquisition in the breeding tanks. Each spawning consisted of 400 to 500 eggs, which
were elliptical in shape with a length of 1.1 ± 0.1 mmand a maximum width of 0.4 mm. The incubation period
lasted for 96 h at a water temperature of 28 ± 1 °C, and most of the time, males guarded the eggs than did females.
The embryonic development and colour changes of eggs during incubation were documented. The hatching
percentage ranged from 93% to 98% at water temperature 29 °C. The size of newly hatched larva varied
between 1.9 ± 0.1 mmlong and themouth gape varied between 90 and 110 μm, and its behaviourwas also documented.
Larval rearingwas carried out in 250-L rectangular tanks using phytoplanktons Nannochloropsis oculata
and Chlorella salina (1:1 proportion at 1–5 × 106 cellsml−1), alongwith different combinations of live micro zooplanktons:
Diet I (Brachionus rotundiformis from1 to 7 dph and Brachionus plicatilis from8 to 18 dph), Diet II (ciliates
Euplotes sp. from 1 to 7 dph and B. rotundiformis from 8 to 18 dph) and Diet III: B. plicatilis from1 to 18 dph
and Diet IV (Calaniod copepod Acartia danae nauplii from1 to 7 dph and B. rotundiformis from 8 to 18 dph). In all
diets, Artemia nauplii were fed from 19 to 40 dph to standardize its larval rearing and were provided with 24 h
light. All the zooplankton species except copepods were enriched using Algamac 2000. Out of the four tested
diets, Diet II showed maximum survival rate (66% ± 0.23%) followed by Diet IV (40% ± 0.40%), Diet I
(10% ± 0.61%) and Diet III (3% ± 0.46%). The larvae metamorphosed to juveniles within 35 to 40 days of
post-hatch (dph). This is the first scientific report on breeding of N. decora under captivity.
 
Publisher Elsevier
 
Date 2014
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/10771/1/Captive%20spawning_Nemateleotris%20decora_Aquaculture_2014.pdf
Madhu, K and Madhu, Rema (2014) Captive spawning and embryonic development of marine ornamental purple firefish Nemateleotris decora (Randall & Allen, 1973). Aquaculture, 424-42. pp. 1-9.