The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
Denis Ricquemarie - One of the best experts on this subject based on the ideXlab platform.
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shrimp ulva co culture a sustainable alternative to diminish the need for artificial feed and improve shrimp quality
Aquaculture, 2010Co-Authors: Lucia Elizabeth Cruzsuarez, Armando Leon, Alberto Penarodriguez, Gustavo Rodriguezpena, Benjamin Moll, Denis RicquemarieAbstract:Juvenile shrimp Litopenaeus vannamei (3.5 g initial weight) and green seaweed Ulva clathrata were co-cultured in outdoors tanks (2000 L) for 45 days; co-cultured Ulva was suspended on a mesh stretched on the water surface. Four dietary treatments were evaluated: Ulva alone, Ulva + 55% feed Ration, Ulva + 90% feed Ration, and 100% feed Ration (control group without co-cultured Ulva). The control group was fed a commercial pellet (30% protein, 8% fat) at a daily Ration of 3.5% shrimp biomass. Water turbidity in co-culture tanks was lower than that in control group. Survival was similar among the experimental groups (>80%). The Ulva intake by shrimp improved the artificial feed conversion ratio and the growth rate: with 10 or 45% less commercial feed, growth rate improved by 60%. Additionally, U. clathrata intake diminished lipids content in shrimp carcass and also modified the fatty acids profile. Shrimp body carotenoids content was significantly higher in the co-culture groups, suggesting that Ulva carotenoids were efficiently assimilated and metabolized, and also may be involved in growth enhancement.
Takeshi Tomiyama - One of the best experts on this subject based on the ideXlab platform.
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Food availability before aestivation governs growth and winter reproductive potential in the capital breeding fish, Ammodytes japonicus
PloS one, 2019Co-Authors: Hirotsune Kuzuhara, Michio Yoneda, Tatsuo Tsuzaki, Masanori Takahashi, Naoaki Kono, Takeshi TomiyamaAbstract:Capital breeders develop gametes by using energy that was stored before the spawning season. Energy is allocated to growth and reproduction, and limited food availability affects the balance of energy allocation, especially in fish that mature within a year, such as western sand lance (Ammodytes japonicus). This species aestivates without feeding until winter spawning and utilize energy stores that were accumulated prior to aestivation for matuRation and spawning. This study aimed to evaluate the growth, energy storage, matuRation rate, and reproduction of A. japonicus in response to food availability before aestivation. We conducted laboratory experiments in which young-of-the-year A. japonicus were fed at rates of 4% and 1% of their body weight per day; assigned as high and low Ration groups, respectively. In June, body length was found to be significantly larger in the high Ration group than in the low Ration group, but the somatic condition did not differ significantly between the groups. MatuRation rates and average fecundities were 1.0 and 6297 in the high Ration group and 0.8 and 2251 in the low Ration group, respectively. These results indicate that food availability before aestivation strongly governs the reproductive potential of A. japonicus, and suggest the involvement of mechanisms in the inter-annual recruitment variation in sand lance species.
Lucie Gadenne - One of the best experts on this subject based on the ideXlab platform.
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Can Rationing Increase Welfare? Theory and an Application to India’s Ration Shop System
American Economic Journal: Economic Policy, 2020Co-Authors: Lucie GadenneAbstract:In many developing countries, households can purchase limited quantities of goods at a fixed subsidized price through Ration shops. This paper asks whether the characteristics of developing countries explain why governments use such systems. I find an equity-efficiency trade-off: an efficiency-maximizing government will never use Ration shops, but a welfare-maximizing one might to redistribute and provide insurance. Welfare gains of Ration shops will be highest for necessity goods and goods with high price risk. I calibrate the model for India and find that Ration shops are welfare improving for three of the four goods sold through the system today. (JEL D12, H23, H25, O12)
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Can Rationing increase welfare? Theory and an application to India's Ration shop system
2018Co-Authors: Lucie GadenneAbstract:Ration shop systems allow households to purchase limited quantities of some commodities at a fixed subsidized price and are in widespread use throughout the developing world. I construct a model of piece-wise increasing commodity taxation to consider whether the use of Ration shops can be Rationalized by the characteristics of developing countries: limited government capacity to observe household incomes and high commodity price risk. I find that an efficiency-maximizing government will never use Ration shops but a welfare-maximizing one might, to redistribute and provide insurance. Welfare gains from introducing Ration shops are highest for necessity goods with high price risk. CalibRation results for India suggest that Ration shops are welfare-improving relative to a universal transfer scheme for three of the four goods sold through the system today. Welfare gains are wiped out however once more than 6% of the funds allocated to Ration shops are lost to corruption or administrative costs.
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Can Rationing increase welfare? Theory and an application to India's Ration shop system
2018Co-Authors: Lucie GadenneAbstract:In many developing countries, households can purchase limited quantities of goods at a fixed subsidized price through Ration shops. This paper asks whether the characteristics of developing countries explain why governments use such systems. I find an equity-efficiency trade-off: an efficiency-maximizing government will never use Ration shops, but a welfare-maximizing one might to redistribute and provide insurance. Welfare gains of Ration shops will be highest for necessity goods and goods with high price risk. I calibrate the model for India and find that Ration shops are welfare improving for three of the four goods sold through the system today.
Mgg Chagunda - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of carcass quality of growing rabbits (Oryctolagus cunniculus) fed soybean (Glycine max), cowpea (Vigna unguiculata) and pigeon pea (Cajanus cajan)
2013Co-Authors: D. M. Chisowa, J. P. Mtimuni, Rkd Phoya, Mgg ChagundaAbstract:Rabbit responses to Pigeon pea (PP), Cowpea (CoP) and Soybean (SB) as sources of protein for growing rabbits were determined. Flemish Giant (FG), California Black (CB) and New Zealand White (NZW)) were fed Soybean (Glycine max), Pigeon pea (Cajunus cajan) and Cowpea (Vigna unguiculata) as protein sources in the Ration. Eighteen rabbits weaned at six weeks of age were used for each breed (a total of 54 rabbits) out of which six of them were assigned to Ration 1 (containing 31.6 % sSoybean), six rabbits to Ration 2 (containing 72 % Cowpea) and the last six to Ration 3 (containing 70.18 % Pigeon pea). The rabbits were randomly assigned to fifty four cages in a 3 x 3 factorial experiment. The three legume grains were roasted before Rations were compounded. Raw Legume Grains (RaLG), Roasted Legume Grains(RoLG) and the three Rations (1, 2 and 3) were analyzed for tannin content (TC). TC was significantly (p
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Effect of Open Fire Roasting on Reducing Tannin Content in Soybean (Glycine max), Cowpea (Vigna unguiculata) and Pigeon Pea (Cajanus cajan)
2013Co-Authors: D. M. Chisowa, J. P. Mtimuni, Rkd Phoya, Mgg ChagundaAbstract:The effect of roasting in reducing anti-nutritional factors (ANF), in legume grains (pigeon pea (PP), cowpea (CoP) and soybean (SB) as source of proteins for growing rabbits was evaluated. Flemish Giant (FG), California Black (CB) and New Zealand White (NZW)) were fed soybean (Glycine max), pigeon pea (Cajanus cajan) and cowpea (Vigna unguiculata) as protein sources in the Ration. Eighteen rabbits weaned at six weeks of age were used for each breed (a total of 54 rabbits) out of which six of them were assigned to Ration 1 (containing 31.6 % soybean), six rabbits to Ration 2 (containing 72 % cowpea) and the last six to Ration 3 (containing 70.18 % pigeon pea). The rabbits were randomly assigned to fifty four cages in a 3 x 3 factorial experiment. The three legume grains were roasted to a uniform light brown colour using ordinary open fire, before Rations were compounded. Raw Legume Grains (RaLG), Roasted Legume Grains(RoLG) and the three Rations (1, 2 and 3) were analyzed for tannin content (TC). TC was significantly (p
Lucia Elizabeth Cruzsuarez - One of the best experts on this subject based on the ideXlab platform.
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shrimp ulva co culture a sustainable alternative to diminish the need for artificial feed and improve shrimp quality
Aquaculture, 2010Co-Authors: Lucia Elizabeth Cruzsuarez, Armando Leon, Alberto Penarodriguez, Gustavo Rodriguezpena, Benjamin Moll, Denis RicquemarieAbstract:Juvenile shrimp Litopenaeus vannamei (3.5 g initial weight) and green seaweed Ulva clathrata were co-cultured in outdoors tanks (2000 L) for 45 days; co-cultured Ulva was suspended on a mesh stretched on the water surface. Four dietary treatments were evaluated: Ulva alone, Ulva + 55% feed Ration, Ulva + 90% feed Ration, and 100% feed Ration (control group without co-cultured Ulva). The control group was fed a commercial pellet (30% protein, 8% fat) at a daily Ration of 3.5% shrimp biomass. Water turbidity in co-culture tanks was lower than that in control group. Survival was similar among the experimental groups (>80%). The Ulva intake by shrimp improved the artificial feed conversion ratio and the growth rate: with 10 or 45% less commercial feed, growth rate improved by 60%. Additionally, U. clathrata intake diminished lipids content in shrimp carcass and also modified the fatty acids profile. Shrimp body carotenoids content was significantly higher in the co-culture groups, suggesting that Ulva carotenoids were efficiently assimilated and metabolized, and also may be involved in growth enhancement.
