Grow‐Out Systems – Monoculture

Valenti, Wagner C.; New, Michael B.; Salin, Krishna R.; Ye, Jinyun

doi:10.1002/9781444314649.ch9

Cited by 24 publications

(25 citation statements)

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“…Yet, the assumption is that added pond fertilization in other parts of the world will yield similar results of elevated primary productivity. Natural food is an integral part of the diet of M. rosenbergii (New 1995;Valenti and New 2000). Increased availability of natural foods may reduce its dependency on formulated feed, especially when the formulated feed is lacking in nutritional value (Tidwell et al 1995;D'Abramo and New 2000).…”

Section: Supplemental Feeding Quantity (%)mentioning

confidence: 99%

Growout of Freshwater Prawn Macrobrachium rosenbergii in Fertilized Ponds with Reduced Levels of Formulated Feed

Correia

Pereira

Silva

et al. 2003

J World Aquaculture Soc

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Formulated feed for freshwater prawn farming under semi-intensive conditions is expensive, presenting a significant portion of the farm's operating costs. Production and availability of natural food in earthen ponds may reduce the needs for formulated feed. This paper evaluates growth of freshwater prawn Macrobrachiurn rosenbergii under three feeding regimes, where supplemental feed was reduced and natural productivity of the ponds was increased by a fertilization program that included the addition of lime, phosphorus and nitrogen. Prawns (4.35 g) were stocked into 12 50-mZ earthen ponds (6 juvenileslm*) and grown for 84 d feeding on 25% crude protein ration. Chemical and physical water parameters were monitored routinely. Growth and production were similar at 100% formulated feed supplementation with no fertilization and at 50% formulated feed with fertilization, as determined by weight gain, specific growth rate, and net yield (P > 0.05). However, further reduction in feed supplementation (0, 25%, and 50% of feeding rate, respectively, for each subsequent 28d period) with fertilization, yielded shrimp smaller than market size. Feed conversion ratios were significantly higher (P 5 0.05) for the 100% versus the 50% feed supplementation. 0

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Section: Supplemental Feeding Quantity (%)mentioning

confidence: 99%

Growout of Freshwater Prawn Macrobrachium rosenbergii in Fertilized Ponds with Reduced Levels of Formulated Feed

Correia

Pereira

Silva

et al. 2003

J World Aquaculture Soc

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“…Tilapia production has also intensified; Guangdong produced 389 000 mt tilapia on 50 400 hectares of farm land in 2003, and 525 000 mt tilapia on 59 800 hectares in 2006, the yield increased 14% from 7.72 to 8.78 mt ha À1 in 3 years ). Although no farming area data are available for freshwater prawn and L. vannamei farmed in freshwater, some studies also reported the intensifying of these species too (Huang 2003;Valenti et al 2007). Declining farm gate prices of shrimp has caused less efficient producers to drop out (FAO 2006).…”

Section: Intensification and Diversification Of Culture Systemsmentioning

confidence: 99%

A comparative analysis of four internationally traded farmed seafood commodities in China: domestic and international markets as key drivers

Zhang

Murray

Liu

et al. 2015

Reviews in Aquaculture

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The historical development, current status and development trends of four internationally traded farmed seafood commodities, tilapia, penaeid shrimp, macrobrachium prawns and catfish in China were reviewed. China is the world's largest producer of tilapia, penaeid shrimp and macrobrachium prawns but, although farming of channel catfish and some indigenous catfish species is well developed, striped catfish failed to become established. In terms of global exports, China ranks first for tilapia and third for shrimp, while macrobrachium prawns and catfish mainly support domestic markets. Endogenous, biological characteristics and market demand explain the different courses of development and the differentiated focus on domestic and international trade. Tilapia and whiteleg shrimp production illustrated rapid growth in both domestic and international markets based on their favourable culture characteristics and well-developed management systems. Huge production scale and domestic competition have resulted in China attaining a dominant and highly competitive position in the global tilapia market. High value of live freshwater prawns in local markets (and poor processing yield) has limited interest in exports, and local demand is also shifting the emphasis of shrimp production towards domestic markets, and a decline in its international market led to stagnation of channel catfish. Poor tolerance of seasonally low temperatures has restricted tilapia production to south China and completely inhibited the development of striped catfish as a commercial species. Live fish preference and costs of long-distance transportation have restricted domestic consumption of tilapia. A balance between domestic consumption and export is required to optimise future growth opportunities for the industry

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“…The populations of this species have shown differences in the growth and reproductive behaviour patterns and indicated some heterogeneity in specimen sizes (Pantaleão, Hirose, & Costa, ). This factor has several implications for aquaculture since the dominant males are harvested and commercialised (Tidwell, Coyle, Bright, VanArnum, & Weibel, ; Valenti, ; Valenti, New, Salin, & Ye, ). Males reach dominant morphotypes through successive molting and acquire dominant characteristics (Moraes‐Riodades & Valenti, ; Moraes‐Valenti & Valenti, ).…”

Section: Introductionmentioning

confidence: 99%

Effects of dietary cholesterol on hepatopancreas associated with morphotypic differentiation in male Amazon River Prawns,Macrobrachium amazonicum(Heller, 1862)

et al. 2019

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Cholesterol is a necessary element in the diet of prawns and it is involved in the metabolic processes of sexual maturation and synthesis of the molting hormone.Freshwater prawns are not able to synthesise cholesterol from specialised metabolic pathways. The aim of this study was to describe changes in structural and morphometric patterns of hepatopancreas associated with morphotypic differentiation of males Macrobrachium amazonicum when fed with different levels of cholesterol.Considering the four morphotypes of this species, Translucent Claw morphotype specimens were split into experimental units and divided into four groups, fed with different levels of cholesterol (0%, 0.5%, 1%, 2%) for 50 days. They were collected as they reached Green Claw (GC) morphotype, weighed to determine the hepatosomatic index, and the hepatopancreas was processed in histological routine for morphologic and morphometric analysis. In this study, it was possible to observe that the 2% cholesterol treatment exhibited more animals that reached the GC morphotype, and there was no significant weight gain in all treatments. Histologically, B-cell abundance and hypervacuolized as well as F-and R-cells shortages were observed as the percentage of cholesterol increased. This alteration in cellular profile correlates with the morphometric analyses that exhibited an increase in epithelial area and alterations in the lumen shape. This imbalance observed in the lumen-epithelium relationship may be associated with a low digestive performance and possibly congested the functions of hepatopancreas. Thus, high doses of cholesterol promoted morphotypic differentiation without weight gain, due to alterations on hepatopancreas. K E Y W O R D S

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Grow‐Out Systems – Monoculture

Cited by 24 publications

References 0 publications

Growout of Freshwater Prawn Macrobrachium rosenbergii in Fertilized Ponds with Reduced Levels of Formulated Feed

Growout of Freshwater Prawn Macrobrachium rosenbergii in Fertilized Ponds with Reduced Levels of Formulated Feed

A comparative analysis of four internationally traded farmed seafood commodities in China: domestic and international markets as key drivers

Effects of dietary cholesterol on hepatopancreas associated with morphotypic differentiation in male Amazon River Prawns,Macrobrachium amazonicum(Heller, 1862)

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