Grow‐out Systems ‐ Monoculture

Valenti, Wagner C.; New, Michael B.

doi:10.1002/9780470999554.ch10

Cited by 25 publications

(11 citation statements)

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“…Biomass within a pond at a specific time depends on number and weight of individuals (Valenti and New 2000). Therefore, production is determined by stocking density, growth, and survival at harvest.…”

Section: Discussionmentioning

confidence: 99%

“…Growth rate of any organism depends on both intrinsic factors, such as genetic characteristics of each population, and extrinsic factors (environment), which act upon the individual during ontogenetic development (Valenti and New 2000). According to Hartnoll (1982), the principal exogenous factors that influence crustacean growth are temperature and food availability.…”

Section: Discussionmentioning

confidence: 99%

“…Population density influences growth and survival rates because it changes the magnitude of prawn interaction, evidenced in competition, social, and agonistic behavior (Valenti and New 2000). When vital resources are insufficient, competition and agonistic behavior presumably intensify.…”

Section: Discussionmentioning

confidence: 99%

“…This value is within the range of productivity obtained for penaeid shrimps in intensive systems (5000–10000 kg/ha/yr; Wickins and Lee 2002). Yet, M. rosenbergii annual productivity in commercial cultures generally varies between 1000 and 4000 kg/ha (Valenti and New 2000; Wickins and Lee 2002). In Brazil, production has ranged between 1000 and 4500 kg/ha (Valenti and Moraes‐Riodades 2004), whereas it is about 1500 kg/ha in the Dominican Republic, 1200–2500 kg/ha in India, 900–3150 kg/ha in Malaysia, 520–1926 kg/ha in Martinique, 1283 kg/ha in Polynesia, 600–2750 kg/ha in Vietnam, 909–1909 kg/ha in Puerto Rico (USA), 2000 kg/ha in Taiwan (China), 1500 and 3100 kg/ha without and with aeration, respectively, in Thailand (New 2002).…”

Section: Discussionmentioning

confidence: 99%

“…These systems differ basically by the degree of intervention of the producer, stocking density, and aimed productivity. Macrobrachium species adapt very well to extensive and semi‐intensive systems, reaching productivities of 500 and 5000 kg/ha/yr, respectively (Valenti and New 2000; New 2002). Intensive and superintensive systems, with productivities up to 10,000 and 50,000 kg/ha/yr, respectively, have been used with penaeid shrimps (Wickins and Lee 2002).…”

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confidence: 99%

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Effect of Intensification on Grow Out of the Amazon River Prawn, Macrobrachium amazonicum

Moraes‐Valenti¹,

Valenti²

2007

J World Aquaculture Soc

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The effects of intensification on growth, survival, productivity, population structure, and distribution of harvested biomass in individual size classes of Macrobrachium amazonicum in semi‐intensive culture were evaluated. Postlarvae (0.01 g) were stocked in 12 ponds at densities of 10, 20, 40, and 80/m2 (three replicates per treatment) and raised for 5.5 mo. Average individual weight significantly decreased and productivity significantly increased as stocking density increased (P < 0.001), while survival was not affected (P > 0.05). Prawn mean weight at harvest ranged from 3.6 (80/m2) to 7.0 g (10/m2). Average survival ranged from 65.5% (40/m2) to 72.8% (20/m2), while productivity ranged from 508 (10/m2) to 2051 kg/ha (80/m2). Harvested biomass showed a clear bimodal distribution in individual size classes indicating the occurrence of heterogeneous growth, which may affect management and market strategies. Harvested biomass of prawns weighing more than 7 g (the best market size) increases for stocking densities up to 40/m2 and stabilizes between 40 and 80/m2. Growth reduction was associated with a decreasing frequency and average weight of green claw 1 and green claw 2 male morphotypes and adult females as density increased. Thus, the distribution of male morphotypes and sexually mature females are affected by density‐dependent factors. Results suggest that prawn density plays an important role on M. amazonicum grow‐out phase, as has been demonstrated for other species of the genus Macrobrachium. M. amazonicum tolerates grow‐out intensification and may be raised in both semi‐intensive and intensive systems stocked at very high densities yielding high productivity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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