Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions

<p<Aquaculture is the fastest food growing activity in the world food sector. The global aquaculture production increased 13 times, from 8.53 million tonnes in 1970 to 64.82 million tonnes in 2007. Total annual global production of all freshwater prawn species was nearly 460,000 tonnes with a...
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Autor*in:	RMG Ratnayake [verfasserIn] T Sivananthawerl [verfasserIn] CN Walpita [verfasserIn] U Edirisinghe [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2011

Schlagwörter:	macrobrachium rosenbergii male: female ratio salinity level

Übergeordnetes Werk:	In: Tropical Agricultural Research - Postgraduate Institute of Agriculture, University of Peradeniya, 2019, 22(2011), 4, Seite 410-415
Übergeordnetes Werk:	volume:22 ; year:2011 ; number:4 ; pages:410-415

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.4038/tar.v22i4.3793

Katalog-ID:	DOAJ074424211

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spelling	10.4038/tar.v22i4.3793 doi (DE-627)DOAJ074424211 (DE-599)DOAJe6762327211d4302b5bb1a1e447dd10d DE-627 ger DE-627 rakwb eng RMG Ratnayake verfasserin aut Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<Aquaculture is the fastest food growing activity in the world food sector. The global aquaculture production increased 13 times, from 8.53 million tonnes in 1970 to 64.82 million tonnes in 2007. Total annual global production of all freshwater prawn species was nearly 460,000 tonnes with a value exceeding US $ 1.8 billion in 2007. Main freshwater prawn species commercially cultured in the world is Macrobrachium rosenbergii, Experiments were conducted at Brackish Water Prawn Breeding Station Pambala, Chilaw. First experiment was conducted to determine the suitable male and female ratio for <em<Machrobrachium rosenbergii</em< under Sri Lankan hatchery conditions. In this experiment males and females in 1:10, 1:8, and 1:5, 1:3 ratios were cultured under artificial conditions in the hatchery. Three cement tanks (8x6x1m) each separated into 4 parts by using plastic mesh frames were used. Each replicate had one blue clawed male and the experiment was repeated. Results revealed that 1:5 ratio gave significantly higher (P<0.05) larvae, while in 1:10 ratio both eggs and larvae were in minimum numbers. The second experiment was conducted to determine the optimum salinity level for spawning of gravid females under Sri Lankan conditions. For this experiment, four fiber glass tanks each of 1000 L having two gravid females were used. Salinity was kept at 4, 5, 6, and 7 ppt and a constant temperature of 28<sup<0</sup<C was maintained. Experiment was repeated three times. Results revealed that 5 ppt salinity gave the optimum conditions. These results could be used to obtain higher production of <em<M. rosenbergii</em< seeds under Sri Lankan conditions.</p<<p<<strong<Key Words: </strong<Macrobrachium rosenbergii; Male: female ratio; Salinity level.</p<<p<DOI: http://dx.doi.org/10.4038/tar.v22i4.3793</p<<p<<em<TAR </em<2011; 22(4): 410-415</p< macrobrachium rosenbergii male: female ratio salinity level Agriculture S T Sivananthawerl verfasserin aut CN Walpita verfasserin aut U Edirisinghe verfasserin aut In Tropical Agricultural Research Postgraduate Institute of Agriculture, University of Peradeniya, 2019 22(2011), 4, Seite 410-415 (DE-627)684963523 (DE-600)2648923-5 27060233 nnns volume:22 year:2011 number:4 pages:410-415 https://doi.org/10.4038/tar.v22i4.3793 kostenfrei https://doaj.org/article/e6762327211d4302b5bb1a1e447dd10d kostenfrei https://tar.sljol.info/articles/3793 kostenfrei https://doaj.org/toc/1016-1422 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4367 GBV_ILN_4700 AR 22 2011 4 410-415
allfields_unstemmed	10.4038/tar.v22i4.3793 doi (DE-627)DOAJ074424211 (DE-599)DOAJe6762327211d4302b5bb1a1e447dd10d DE-627 ger DE-627 rakwb eng RMG Ratnayake verfasserin aut Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<Aquaculture is the fastest food growing activity in the world food sector. The global aquaculture production increased 13 times, from 8.53 million tonnes in 1970 to 64.82 million tonnes in 2007. Total annual global production of all freshwater prawn species was nearly 460,000 tonnes with a value exceeding US $ 1.8 billion in 2007. Main freshwater prawn species commercially cultured in the world is Macrobrachium rosenbergii, Experiments were conducted at Brackish Water Prawn Breeding Station Pambala, Chilaw. First experiment was conducted to determine the suitable male and female ratio for <em<Machrobrachium rosenbergii</em< under Sri Lankan hatchery conditions. In this experiment males and females in 1:10, 1:8, and 1:5, 1:3 ratios were cultured under artificial conditions in the hatchery. Three cement tanks (8x6x1m) each separated into 4 parts by using plastic mesh frames were used. Each replicate had one blue clawed male and the experiment was repeated. Results revealed that 1:5 ratio gave significantly higher (P<0.05) larvae, while in 1:10 ratio both eggs and larvae were in minimum numbers. The second experiment was conducted to determine the optimum salinity level for spawning of gravid females under Sri Lankan conditions. For this experiment, four fiber glass tanks each of 1000 L having two gravid females were used. Salinity was kept at 4, 5, 6, and 7 ppt and a constant temperature of 28<sup<0</sup<C was maintained. Experiment was repeated three times. Results revealed that 5 ppt salinity gave the optimum conditions. These results could be used to obtain higher production of <em<M. rosenbergii</em< seeds under Sri Lankan conditions.</p<<p<<strong<Key Words: </strong<Macrobrachium rosenbergii; Male: female ratio; Salinity level.</p<<p<DOI: http://dx.doi.org/10.4038/tar.v22i4.3793</p<<p<<em<TAR </em<2011; 22(4): 410-415</p< macrobrachium rosenbergii male: female ratio salinity level Agriculture S T Sivananthawerl verfasserin aut CN Walpita verfasserin aut U Edirisinghe verfasserin aut In Tropical Agricultural Research Postgraduate Institute of Agriculture, University of Peradeniya, 2019 22(2011), 4, Seite 410-415 (DE-627)684963523 (DE-600)2648923-5 27060233 nnns volume:22 year:2011 number:4 pages:410-415 https://doi.org/10.4038/tar.v22i4.3793 kostenfrei https://doaj.org/article/e6762327211d4302b5bb1a1e447dd10d kostenfrei https://tar.sljol.info/articles/3793 kostenfrei https://doaj.org/toc/1016-1422 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4367 GBV_ILN_4700 AR 22 2011 4 410-415
allfieldsGer	10.4038/tar.v22i4.3793 doi (DE-627)DOAJ074424211 (DE-599)DOAJe6762327211d4302b5bb1a1e447dd10d DE-627 ger DE-627 rakwb eng RMG Ratnayake verfasserin aut Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<Aquaculture is the fastest food growing activity in the world food sector. The global aquaculture production increased 13 times, from 8.53 million tonnes in 1970 to 64.82 million tonnes in 2007. Total annual global production of all freshwater prawn species was nearly 460,000 tonnes with a value exceeding US $ 1.8 billion in 2007. Main freshwater prawn species commercially cultured in the world is Macrobrachium rosenbergii, Experiments were conducted at Brackish Water Prawn Breeding Station Pambala, Chilaw. First experiment was conducted to determine the suitable male and female ratio for <em<Machrobrachium rosenbergii</em< under Sri Lankan hatchery conditions. In this experiment males and females in 1:10, 1:8, and 1:5, 1:3 ratios were cultured under artificial conditions in the hatchery. Three cement tanks (8x6x1m) each separated into 4 parts by using plastic mesh frames were used. Each replicate had one blue clawed male and the experiment was repeated. Results revealed that 1:5 ratio gave significantly higher (P<0.05) larvae, while in 1:10 ratio both eggs and larvae were in minimum numbers. The second experiment was conducted to determine the optimum salinity level for spawning of gravid females under Sri Lankan conditions. For this experiment, four fiber glass tanks each of 1000 L having two gravid females were used. Salinity was kept at 4, 5, 6, and 7 ppt and a constant temperature of 28<sup<0</sup<C was maintained. Experiment was repeated three times. Results revealed that 5 ppt salinity gave the optimum conditions. These results could be used to obtain higher production of <em<M. rosenbergii</em< seeds under Sri Lankan conditions.</p<<p<<strong<Key Words: </strong<Macrobrachium rosenbergii; Male: female ratio; Salinity level.</p<<p<DOI: http://dx.doi.org/10.4038/tar.v22i4.3793</p<<p<<em<TAR </em<2011; 22(4): 410-415</p< macrobrachium rosenbergii male: female ratio salinity level Agriculture S T Sivananthawerl verfasserin aut CN Walpita verfasserin aut U Edirisinghe verfasserin aut In Tropical Agricultural Research Postgraduate Institute of Agriculture, University of Peradeniya, 2019 22(2011), 4, Seite 410-415 (DE-627)684963523 (DE-600)2648923-5 27060233 nnns volume:22 year:2011 number:4 pages:410-415 https://doi.org/10.4038/tar.v22i4.3793 kostenfrei https://doaj.org/article/e6762327211d4302b5bb1a1e447dd10d kostenfrei https://tar.sljol.info/articles/3793 kostenfrei https://doaj.org/toc/1016-1422 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4367 GBV_ILN_4700 AR 22 2011 4 410-415
allfieldsSound	10.4038/tar.v22i4.3793 doi (DE-627)DOAJ074424211 (DE-599)DOAJe6762327211d4302b5bb1a1e447dd10d DE-627 ger DE-627 rakwb eng RMG Ratnayake verfasserin aut Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions 2011 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier <p<Aquaculture is the fastest food growing activity in the world food sector. The global aquaculture production increased 13 times, from 8.53 million tonnes in 1970 to 64.82 million tonnes in 2007. Total annual global production of all freshwater prawn species was nearly 460,000 tonnes with a value exceeding US $ 1.8 billion in 2007. Main freshwater prawn species commercially cultured in the world is Macrobrachium rosenbergii, Experiments were conducted at Brackish Water Prawn Breeding Station Pambala, Chilaw. First experiment was conducted to determine the suitable male and female ratio for <em<Machrobrachium rosenbergii</em< under Sri Lankan hatchery conditions. In this experiment males and females in 1:10, 1:8, and 1:5, 1:3 ratios were cultured under artificial conditions in the hatchery. Three cement tanks (8x6x1m) each separated into 4 parts by using plastic mesh frames were used. Each replicate had one blue clawed male and the experiment was repeated. Results revealed that 1:5 ratio gave significantly higher (P<0.05) larvae, while in 1:10 ratio both eggs and larvae were in minimum numbers. The second experiment was conducted to determine the optimum salinity level for spawning of gravid females under Sri Lankan conditions. For this experiment, four fiber glass tanks each of 1000 L having two gravid females were used. Salinity was kept at 4, 5, 6, and 7 ppt and a constant temperature of 28<sup<0</sup<C was maintained. Experiment was repeated three times. Results revealed that 5 ppt salinity gave the optimum conditions. These results could be used to obtain higher production of <em<M. rosenbergii</em< seeds under Sri Lankan conditions.</p<<p<<strong<Key Words: </strong<Macrobrachium rosenbergii; Male: female ratio; Salinity level.</p<<p<DOI: http://dx.doi.org/10.4038/tar.v22i4.3793</p<<p<<em<TAR </em<2011; 22(4): 410-415</p< macrobrachium rosenbergii male: female ratio salinity level Agriculture S T Sivananthawerl verfasserin aut CN Walpita verfasserin aut U Edirisinghe verfasserin aut In Tropical Agricultural Research Postgraduate Institute of Agriculture, University of Peradeniya, 2019 22(2011), 4, Seite 410-415 (DE-627)684963523 (DE-600)2648923-5 27060233 nnns volume:22 year:2011 number:4 pages:410-415 https://doi.org/10.4038/tar.v22i4.3793 kostenfrei https://doaj.org/article/e6762327211d4302b5bb1a1e447dd10d kostenfrei https://tar.sljol.info/articles/3793 kostenfrei https://doaj.org/toc/1016-1422 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4367 GBV_ILN_4700 AR 22 2011 4 410-415
language	English
source	In Tropical Agricultural Research 22(2011), 4, Seite 410-415 volume:22 year:2011 number:4 pages:410-415
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spellingShingle	RMG Ratnayake misc macrobrachium rosenbergii misc male: female ratio misc salinity level misc Agriculture misc S Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions
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topic_title	Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions macrobrachium rosenbergii male: female ratio salinity level
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title	Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions
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title_full	Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions
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title_sort	determination of optimum male: female ratio and salinity level for larval production of <i<macrobrachium rosenbergii</i< (de man 1879) under sri lankan conditions
title_auth	Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions
abstract	<p<Aquaculture is the fastest food growing activity in the world food sector. The global aquaculture production increased 13 times, from 8.53 million tonnes in 1970 to 64.82 million tonnes in 2007. Total annual global production of all freshwater prawn species was nearly 460,000 tonnes with a value exceeding US $ 1.8 billion in 2007. Main freshwater prawn species commercially cultured in the world is Macrobrachium rosenbergii, Experiments were conducted at Brackish Water Prawn Breeding Station Pambala, Chilaw. First experiment was conducted to determine the suitable male and female ratio for <em<Machrobrachium rosenbergii</em< under Sri Lankan hatchery conditions. In this experiment males and females in 1:10, 1:8, and 1:5, 1:3 ratios were cultured under artificial conditions in the hatchery. Three cement tanks (8x6x1m) each separated into 4 parts by using plastic mesh frames were used. Each replicate had one blue clawed male and the experiment was repeated. Results revealed that 1:5 ratio gave significantly higher (P<0.05) larvae, while in 1:10 ratio both eggs and larvae were in minimum numbers. The second experiment was conducted to determine the optimum salinity level for spawning of gravid females under Sri Lankan conditions. For this experiment, four fiber glass tanks each of 1000 L having two gravid females were used. Salinity was kept at 4, 5, 6, and 7 ppt and a constant temperature of 28<sup<0</sup<C was maintained. Experiment was repeated three times. Results revealed that 5 ppt salinity gave the optimum conditions. These results could be used to obtain higher production of <em<M. rosenbergii</em< seeds under Sri Lankan conditions.</p<<p<<strong<Key Words: </strong<Macrobrachium rosenbergii; Male: female ratio; Salinity level.</p<<p<DOI: http://dx.doi.org/10.4038/tar.v22i4.3793</p<<p<<em<TAR </em<2011; 22(4): 410-415</p<
abstractGer	<p<Aquaculture is the fastest food growing activity in the world food sector. The global aquaculture production increased 13 times, from 8.53 million tonnes in 1970 to 64.82 million tonnes in 2007. Total annual global production of all freshwater prawn species was nearly 460,000 tonnes with a value exceeding US $ 1.8 billion in 2007. Main freshwater prawn species commercially cultured in the world is Macrobrachium rosenbergii, Experiments were conducted at Brackish Water Prawn Breeding Station Pambala, Chilaw. First experiment was conducted to determine the suitable male and female ratio for <em<Machrobrachium rosenbergii</em< under Sri Lankan hatchery conditions. In this experiment males and females in 1:10, 1:8, and 1:5, 1:3 ratios were cultured under artificial conditions in the hatchery. Three cement tanks (8x6x1m) each separated into 4 parts by using plastic mesh frames were used. Each replicate had one blue clawed male and the experiment was repeated. Results revealed that 1:5 ratio gave significantly higher (P<0.05) larvae, while in 1:10 ratio both eggs and larvae were in minimum numbers. The second experiment was conducted to determine the optimum salinity level for spawning of gravid females under Sri Lankan conditions. For this experiment, four fiber glass tanks each of 1000 L having two gravid females were used. Salinity was kept at 4, 5, 6, and 7 ppt and a constant temperature of 28<sup<0</sup<C was maintained. Experiment was repeated three times. Results revealed that 5 ppt salinity gave the optimum conditions. These results could be used to obtain higher production of <em<M. rosenbergii</em< seeds under Sri Lankan conditions.</p<<p<<strong<Key Words: </strong<Macrobrachium rosenbergii; Male: female ratio; Salinity level.</p<<p<DOI: http://dx.doi.org/10.4038/tar.v22i4.3793</p<<p<<em<TAR </em<2011; 22(4): 410-415</p<
abstract_unstemmed	<p<Aquaculture is the fastest food growing activity in the world food sector. The global aquaculture production increased 13 times, from 8.53 million tonnes in 1970 to 64.82 million tonnes in 2007. Total annual global production of all freshwater prawn species was nearly 460,000 tonnes with a value exceeding US $ 1.8 billion in 2007. Main freshwater prawn species commercially cultured in the world is Macrobrachium rosenbergii, Experiments were conducted at Brackish Water Prawn Breeding Station Pambala, Chilaw. First experiment was conducted to determine the suitable male and female ratio for <em<Machrobrachium rosenbergii</em< under Sri Lankan hatchery conditions. In this experiment males and females in 1:10, 1:8, and 1:5, 1:3 ratios were cultured under artificial conditions in the hatchery. Three cement tanks (8x6x1m) each separated into 4 parts by using plastic mesh frames were used. Each replicate had one blue clawed male and the experiment was repeated. Results revealed that 1:5 ratio gave significantly higher (P<0.05) larvae, while in 1:10 ratio both eggs and larvae were in minimum numbers. The second experiment was conducted to determine the optimum salinity level for spawning of gravid females under Sri Lankan conditions. For this experiment, four fiber glass tanks each of 1000 L having two gravid females were used. Salinity was kept at 4, 5, 6, and 7 ppt and a constant temperature of 28<sup<0</sup<C was maintained. Experiment was repeated three times. Results revealed that 5 ppt salinity gave the optimum conditions. These results could be used to obtain higher production of <em<M. rosenbergii</em< seeds under Sri Lankan conditions.</p<<p<<strong<Key Words: </strong<Macrobrachium rosenbergii; Male: female ratio; Salinity level.</p<<p<DOI: http://dx.doi.org/10.4038/tar.v22i4.3793</p<<p<<em<TAR </em<2011; 22(4): 410-415</p<
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title_short	Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions
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The global aquaculture production increased 13 times, from 8.53 million tonnes in 1970 to 64.82 million tonnes in 2007. Total annual global production of all freshwater prawn species was nearly 460,000 tonnes with a value exceeding US $ 1.8 billion in 2007. Main freshwater prawn species commercially cultured in the world is Macrobrachium rosenbergii, Experiments were conducted at Brackish Water Prawn Breeding Station Pambala, Chilaw. First experiment was conducted to determine the suitable male and female ratio for <em<Machrobrachium rosenbergii</em< under Sri Lankan hatchery conditions. In this experiment males and females in 1:10, 1:8, and 1:5, 1:3 ratios were cultured under artificial conditions in the hatchery. Three cement tanks (8x6x1m) each separated into 4 parts by using plastic mesh frames were used. Each replicate had one blue clawed male and the experiment was repeated. Results revealed that 1:5 ratio gave significantly higher (P&lt;0.05) larvae, while in 1:10 ratio both eggs and larvae were in minimum numbers. The second experiment was conducted to determine the optimum salinity level for spawning of gravid females under Sri Lankan conditions. For this experiment, four fiber glass tanks each of 1000 L having two gravid females were used. Salinity was kept at 4, 5, 6, and 7 ppt and a constant temperature of 28<sup<0</sup<C was maintained. Experiment was repeated three times. Results revealed that 5 ppt salinity gave the optimum conditions. 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Determination of Optimum Male: Female Ratio and Salinity Level for Larval Production of <i<Macrobrachium rosenbergii</i< (De Man 1879) under Sri Lankan Conditions

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