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  • Articles  (5)
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  • 1
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    Investigating the application of spawning shelter of Cattle fish for its enhancement of resources (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: In this project,four types of structures,of 40 number was investigated.In a six month period,the structures were inspected 13 times.The total weight and number of eggs hatched on the structures were estimated to be 214.1kg and 94944 respectively.The weight and number of eggs settled on trap types were 141.9 and 60982 respectively,whereas,The eggs on cubical structures were estimated 56.7kg and 27088 ,on pyramid structures 7.9 and 3941 and then also were 6.9kg and 3280 eggs on cylindrical structures respectively.It is also estimated that 358 eggs were settled on The connecting line weighting 0.5kg.In this report four types of structures was compared.As a result,the trap, cubical, pyramid and cylindrical structures had contributed to the settelment of 66,27,4 and 3 percent of eggs in weight. While 64,29,4 and 3 percent of eggs in number was settled on these structures respectively.Thus it is concluded that the trap structures fallowed by cubical ones had acted more effectively relative to other two.If based on the results of other studies,we assume 80% survival rate of eggs and average weight of 1.2kg of survival growth cuttlefish , then it can be calculated that 160 structures can contribute to 91 tons increase in cuttlefish stock in one area of 4 to 5 acre.It is obviaus that by planning an annual increase of the structures,it is passible to attract more spawners to spawn and produce more larvae.Moreover,The old structures will be covered by corals and barnacles and become amore stalie and attractive spawning ground for cuttlefish.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Spawning ; Cuttlefish ; Structures ; Trap ; Growth ; Produce ; Types ; Weight ; Eggs ; Survival rate
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 66pp.
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  • 2
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    Effect of different dietary levels of plant protein on growth indexes of White Leg shrimp (2018)
    Details
    Publication Date: 2021-05-19
    Description: The influence of different dietary levels of plant protein (30, 50 and 70%) on growth indices of White Leg Shrimp (Litopenaeus vannamei) fed with an original 38 percent protein was assessed and compared with that of the commercial shrimp diet. The average weight gain at the end of the culture period in treatment 1 (30% plant protein and 70% animal protein), was 5.89 plus or minus 0.06 grams, for treatment 2 (50% plant protein and 50% animal protein), was 6.22 plus or minus 0.25 grams, for treatment 3 (70% plant protein and 30% animal protein), was 6.19 plus or minus 0.24 grams and for the control treatment (20% plant protein and 80% animal protein), was 6.42 plus or minus 0.40 grams. Our study of the influence of experimental and control diets on growth indices including growth rate (GR), food conversion ratio (FCR), protein efficiency ratio (PER), specific growth rate (SGR), and average daily gain (ADG), demonstrated that the indices were better in the control compared to the treatments. No significant difference was found among the treatments and between the treatments and the control for the indices (P〉0.05). The percent of net protein utilization (NPU) in treatment 1 was significantly more than other treatments (P0.05). We also found that the application of diets containing 50% plant protein (with 20% soybean meal), and 70% plant protein (with 41.72% soybean meal), can decrease diet costs. Cost of one kilogram of pellet, in treatments 1, 2, 3 were, 83.3%, 68.3% and 53.3% lower than the control diet respectively. Decrease of cost in treatment 2 and 3, in comparison to control in terms of lowering shrimp production cost is very important.
    Description: Published
    Keywords: Shrimp culture ; Litopenaeus vannamei ; Growth ; Weight ; Protein deficiency ; Dietary deficiencies ; Feeding experiments ; Feed composition ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.79-88
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  • 3
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    A Study on the Culture Bio-normative of Penaeus semisulcatus-Phase 2 (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Beacaus of increasing genetic variation and avoid of future hazard, monoculture of Iran native shrimp species , penaeus semisulcatus (green tigershrimp) is considered. One of the most important problems in monoculture is detection relationshipbetween biological and nonbiological factors, and thier effects on growth and survival of species.This study was caried out in four ponds (four ponds 0.4 ha). According to results, this species of shrimp needs to quantiative foods , otherwise it caues canibalism, abnormal distribution, in weight distribution diagram of shrimp and reduction of production in squere unit. Amongindependent factors such us water temprature, salinity, PH, transparency,water deep and food consumption rate, four first factors have the mostcorrelation by shrimp weight (r2=0.922).Shrimps weight variation in 3 Range,25-28, 28-31and more them 31 degree centigrade were studied. There wassignificance difference in shrimp rate variation in 3 ranges which werementioned (P〈0.05). Shrimp had best growth in 25-28 degree centigrade.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Penaeus semisulcatus ; Factor physico-chemical ; Green tiger shrimp ; Species ; Temperature ; Weight ; Bionormative ; Culture
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 36pp.
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  • 4
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    Effect of different dietary levels of plant protein on growth indexes of white Leg shrimp (2021)
    In:  http://aquaticcommons.org/id/eprint/23717 | 18721 | 2018-07-20 08:22:49 | 23717 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The influence of different dietary levels of plant protein (30, 50 and 70%) on growth indices of White Leg Shrimp (Litopenaeus vannamei) fed with an original 38 percent protein was assessed and compared with that of the commercial shrimp diet. The average weight gain at the end of the culture period in treatment 1 (30% plant protein and 70% animal protein), was 5.89 plus or minus 0.06 grams, for treatment 2 (50% plant protein and 50% animal protein), was 6.22 plus or minus 0.25 grams, for treatment 3 (70% plant protein and 30% animal protein), was 6.19 plus or minus 0.24 grams and for the control treatment (20% plant protein and 80% animal protein), was 6.42 plus or minus 0.40 grams. Our study of the influence of experimental and control diets on growth indices including growth rate (GR), food conversion ratio (FCR), protein efficiency ratio (PER), specific growth rate (SGR), and average daily gain (ADG), demonstrated that the indices were better in the control compared to the treatments. No significant difference was found among the treatments and between the treatments and the control for the indices (P〉0.05). The percent of net protein utilization (NPU) in treatment 1 was significantly more than other treatments (P〈0.05). We also found that the application of diets containing 50% plant protein (with 20% soybean meal) and 70% plant protein (with 41.72% soybean meal) can decrease diet costs. Cost of one kilogram of pellet in treatments 1, 2, 3 were 83.3%, 68.3% and 53.3% lower than the control diet respectively. Decrease of cost in treatment 2 and 3, in comparison to control in terms of lowering shrimp production cost is very important.
    Keywords: Aquaculture ; Growth ; Weight ; Protein deficiency ; Dietary deficiencies ; Feeding experiments ; Feed composition ; Marine ; Shrimp culture ; Litopenaeus vannamei ; Bushehr Province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 79-88
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  • 5
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    Investigating the application of spawning shelter of cattle fish for its enhancement of resources (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25318 | 18721 | 2018-09-08 16:45:23 | 25318 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: In this project, four types of structures, of 40 number was investigated. In a six month period, the structures were inspected 13 times. The total weight and number of eggs hatched on the structures were estimated to be 214.1kg and 94944 respectively. The weight and number of eggs settled on trap types were 141.9 and 60982 respectively, whereas, The eggs on cubical structures were estimated 56.7kg and 27088 ,on pyramid structures 7.9 and 3941 and then also were 6.9 kg and 3280 eggs on cylindrical structures respectively. It is also estimated that 358 eggs were settled on The connecting line weighting 0.5kg. In this report four types of structures was compared. As a result, the trap, cubical, pyramid and cylindrical structures had contributed to the settelment of 66, 27, 4 and 3 percent of eggs in weight. While 64, 29, 4 and 3 percent of eggs in number was settled on these structures respectively. Thus it is concluded that the trap structures fallowed by cubical ones had acted more effectively relative to other two. If based on the results of other studies, we assume 80% survival rate of eggs and average weight of 1.2 kg of survival growth cuttlefish, then it can be calculated that 160 structures can contribute to 91 tons increase in cuttlefish stock in one area of 4 to 5 acre. It is obvious that by planning an annual increase of the structures, it is possible to attract more spawners to spawn and produce more larvae. Moreover,The old structures will be covered by corals and barnacles and become Amore stalie and attractive spawning ground for cuttlefish.
    Keywords: Aquaculture ; Iran ; Spawning ; Cuttlefish ; Structures ; Trap ; Growth ; Produce ; Types ; Weight ; Eggs ; Survival rate
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 66
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