National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The present paper deals with the comparative larval biology and post larval production of Macrobrachium malcolmsonii (Edwards) and Macrobrachium gangeticum (Bate) were studied under captive using 10-19 ppt brackish water to provide information needed for commercial hatchery technology. The incubation period M. gangeticum 12-13 days, whereas 12-15 days was found in M. malcolmsonii. Ten thousand larvae of both species were stocked in 300 L tanks and fed with live Artemia nauplii, egg custard and mussel meet. The water quality parameters were found within suitable ranged. Larvae showing characteristics of 11 distinct larval stages and size range of zoea larvae stage Ist to XI, 1.85 mm to 10.58 mm M. malcolmsoni, whereas the size of M. gangeticum larvae ranged 1.80 mm to 7.29mm.The first post larvae of both species recorded within 22 days & 47 days and trials were concluded on the 49th day & 63 day respectively. Production of PL in six trails (three for each) during the first year for M. gangeticum 2854, 3099, and 3249, with 14.27, 15.49 and 16.24 PL L-1 whereas in case of M. malcolmsonii 2513, 2236 and 2124 with 12.56, 11.18, and 10.62 PL L-1 in trials 1, 2, and 3, respectively. Post larval production in trials 1, 2, and 3 during the second year of M.gangeticum was recorded at 2916, 3140 and 3185 with 14.58, 15.80 & 15.92PL L-1 whereas in M. malcolmsonii at 2020, 2443 and 2433 with 10.1, 12.21 and 12.16 PL L-1 respectively. The results on larval biology of both the species indicate the commercial culture and wide scope for the establishments of hatcheries in inland regions.
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