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  • 1
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    Investigation on possibility of survival and growth enhancing by selected seaweeds from Persian Gulf in post larvae shrimp Litopenaeus vannamei (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: The use of antibiotics in aquaculture has been limited. Scientifics seeking for natural substitutes to prevent of aquatic animals diseases. Considering seaweeds are rich of nutritions and bioactive compounds, the propose of this study is: investigation the potential and use possibility of native seaweeds from Persian Gulf in shrimp aquculture industry to improve growth, survival of postlarvae and to resistance against pathogens such as vibriosis. For this propose 7 macroalgaes species from Bushehr province coast, inclouding: green algae (C.iyengarii), brown algae (S.angutifolium and S.ilicifolium) and red algae (L.snyderiae, K.alvarezii and G.corticata) were collected and identified. Then seaweed extracts abtained by Water, Ethanol, Methanol and Chloroform solvents by soaking method. In vitro antibacterial activity of extracts against Gr+ bacteria (S.aureus and B.subtilis) and Gr- bacteria (V.harveyi,V.alginolyticus and E.coli) was conducted by Agar diffusion, MIC and MBC methods. Antioxidant activity also by DPPH and EC50 methods was investigated. According to results of these two tests four seaweeds species (S.angutifolium, L.snyderiae, K.alvarezii and G.corticata) were selected for use in shrimp postlarvae (PL22) diets by Bio-Encapsulation (Artemia enrichment). Before of enrichment, toxicity effect of extracts to Artemia naplii were evaluated by determination of LC50 24 h method. From results of this section Ethanol extracts were selected to bioencapsulation. After encapsulation shrimp postlarvae divided to 12 groups in triplicate, namely: C-, C+, S (200), S (400), S (600), L(200), L(400), L(600), G(300), G(600), K(300) and K(600). During 30 days of reared period C- and C+ use of basal diet and unenriched Artemia, but the other groups use of basal diet and enriched Artemia. Except C-, the shrimps in first day of culture put in 107 cfu/ml v.harveyi suspension for 30 minutes, and after water exchange 10 ml of this dose was added to reared aquaria. After 30 days survival percentage, obtained weight and SGR% were investigated. To evaluate vibrio loadind, every 10 days 5 postlarvae were sampled randomly for vibrio count. Results showed that vibrio count in C- was less than the others and in C+ was more than the others. In treatments vibrio count in L(200) was the most and L(600) was the less. Survival rate in C- was the most and after that G(600) with 79.4±6.6% and then S(300) and K(600) were 73.3±7.3% and 70.6±6.6% respectively that were significantly compare the other (P 〈 0.01). Also the C+ was the less with 33.3±6.6% that difference was significant (P〈 0.01). In this study growth parameters of all groups that fed by enriched Artemia were better than C+ (P〈0.05). After cultre period 10 shrimp of every aquarium disinfected and reared for 10 days like before treatment. After 10 days the shrimps were challenged by 3×108 cfu/ml V.harveyi and mortality was recorded for 7 days. The all of animals in C- were survive but more than 90% of C+ were dead. And survival in all of treatments were better the C+ (P〈0.05). the study showed the ethanol extracts of selsected seaweed from Persian Gulf is a good source for growth, Survival and disease control in shrimp larviculture.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Survival ; Growth ; Seaweeds ; Post larvae ; Shrimp ; Litopenaeus vannamei ; Antibiotics ; Aquaculture ; Diseases ; Nutrition ; Macroalgae ; C.iyengarii ; S.angutifolium ; S.ilicifolium ; S.aureus ; B.subtilis ; Artemia ; Larviculture ; Nauplii
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 98pp.
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  • 2
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    Unknown
    Role of aflatoxin B1 on hematological factors, histopathological changes, tissue residual, growth and survival rate of Fenneropenaeus indicus (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Role of aflatoxin B1 on hematological indexes, histopathological changes, tissue residual, growth and survival rate of Fenneropenaeus indicus Some similar cases of aflatoxin chronic poisoning were reported from cultured shrimps in Iran. In this study, Indian white shrimp, Fenneropenaeus indicus, with a weight of 11.79 ± 1.76 grams were fed with diets containing 0, 20, 50, 100, 200, 400, 800 and 1600 ppb levels of AFB1 for 8 weeks. Growth performances, survival rate, residue in muscles and cephalothorax, hematological and histopathological changes were determined after 4 and 8 weeks. The results showed that after 8 week of feeding shrimps with values of 20, 50 and 100 ppb aflatoxin B1, did not affect the growth rate, but with increased levels of Aflatoxin B1 in feed, the growth is reduced and the correlation (r) minus the final weight equal to - 0.312. After eight weeks doses of AFB1 in the diets showed negative correlation to the survival rate, total haemocyte count (THC), total plasma protein (TPP) equal to -0.603, -0.237 and -0.649 respectively. Histopathological changes were variety necrosis, degeneration and atrophy of epithelial and secretory cells lining the tubules, infiltration of fibroblasts in the walls of hepatopancreas tubules, separated muscle bundles in Muscle tissues and intestinal mucosal necrosis and detachment. Possible amelioration was examined by feeding control and treated shrimp (after eight weeks exposure to AFB1) by dietary without AFB1 for four weeks. The Recovery was observed in all parameters of 20, 50, 100 and 200 ppb AFB1 treatments but shrimps fed with the 1600 ppb and 800 ppb concentrations of AFB1 exhibited slower growth, more reddish discoloration disseminated over the body and lack of consistency in the hepatopancreas at 4th week recovery period. After eight weeks, the highest level of aflatoxin B1 residues in shrimp muscles was observed in 100 ppb treatment that its value was 1.55 ppb, but the highest level of aflatoxin B1 residues in cephalothorax was observed in 1600 ppb treatment that its value was 7.1 ppb. In terms of public health, these amounts of aflatoxin in shrimp body are less than permissible limit for human consumption.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Histopathological ; Fungus ; Mycotoxin ; Shrimp ; Fenneropenaeus indicus ; Tissue ; Survival
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 88pp.
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  • 3
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    Unknown
    Investigation on possibility of survival and growth enhancing by selected seaweeds from Persian Gulf in post larvae shrimp Litopenaeus vannamei (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25656 | 18721 | 2018-10-08 08:54:33 | 25656 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: The use of antibiotics in aquaculture has been limited. Scientifics seeking for natural substitutes to prevent of aquatic animals diseases. Considering seaweeds are rich of nutritions and bioactive compounds, the propose of this study is: investigation the potential and use possibility of native seaweeds from Persian Gulf in shrimp aquculture industry to improve growth, survival of postlarvae and to resistance against pathogens such as vibriosis. For this propose 7 macroalgaes species from Bushehr province coast, inclouding: green algae (C.iyengarii), brown algae (S.angutifolium and S.ilicifolium) and red algae (L.snyderiae, K.alvarezii and G.corticata) were collected and identified. Then seaweed extracts abtained by Water, Ethanol, Methanol and Chloroform solvents by soaking method. In vitro antibacterial activity of extracts against Gr^+ bacteria (S.aureus and B.subtilis) and Gr- bacteria (V.harveyi,V.alginolyticus and E.coli) was conducted by Agar diffusion, MIC and MBC methods. Antioxidant activity also by DPPH and EC_50 methods was investigated. According to results of these two tests four seaweeds species (S.angutifolium, L.snyderiae, K.alvarezii and G.corticata) were selected for use in shrimp postlarvae (PL22) diets by Bio-Encapsulation (Artemia enrichment). Before of enrichment, toxicity effect of extracts to Artemia naplii were evaluated by determination of LC_50 24 h method. From results of this section Ethanol extracts were selected to bioencapsulation. After encapsulation shrimp postlarvae divided to 12 groups in triplicate, namely: C^-, C^+, S (200), S (400), S (600), L(200), L(400), L(600), G(300), G(600), K(300) and K(600). During 30 days of reared period C- and C+ use of basal diet and unenriched Artemia, but the other groups use of basal diet and enriched Artemia. Except C-, the shrimps in first day of culture put in 107 cfu/ml v.harveyi suspension for 30 minutes, and after water exchange 10 ml of this dose was added to reared aquaria. After 30 days survival percentage, obtained weight and SGR% were investigated. To evaluate vibrio loadind, every 10 days 5 postlarvae were sampled randomly for vibrio count. Results showed that vibrio count in C^- was less than the others and in C^+ was more than the others. In treatments vibrio count in L(200) was the most and L(600) was the less. Survival rate in C^- was the most and after that G(600) with 79.4±6.6% and then S(300) and K(600) were 73.3±7.3% and 70.6±6.6% respectively that were significantly compare the other (P 〈 0.01). Also the C+ was the less with 33.3±6.6% that difference was significant (P〈 0.01). In this study growth parameters of all groups that fed by enriched Artemia were better than C^+ (P〈0.05). After cultre period 10 shrimp of every aquarium disinfected and reared for 10 days like before treatment. After 10 days the shrimps were challenged by 3×108 cfu/ml V.harveyi and mortality was recorded for 7 days. The all of animals in C^- were survive but more than 90% of C^+ were dead. And survival in all of treatments were better the C^+ (P〈0.05). the study showed the ethanol extracts of selsected seaweed from Persian Gulf is a good source for growth, Survival and disease control in shrimp larviculture.
    Keywords: Aquaculture ; Iran ; Survival ; Growth ; Seaweeds ; Post larvae ; Shrimp ; Litopenaeus vannamei ; Antibiotics ; Aquaculture ; Diseases ; Nutrition ; Macroalgae ; C.iyengarii ; S.angutifolium ; S.ilicifolium ; S.aureus ; B.subtilis ; Artemia ; Larviculture ; Nauplii
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 98
    Location Call Number Expected Availability
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  • 4
    facet.materialart.
    Unknown
    Role of aflatoxin B1 on hematological factors, histopathological changes, tissue residual, growth and survival rate of Fenneropenaeus indicus (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25704 | 18721 | 2018-10-10 09:47:09 | 25704 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Role of aflatoxin B1 on hematological indexes, histopathological changes, tissue residual, growth and survival rate of Fenneropenaeus indicus Some similar cases of aflatoxin chronic poisoning were reported from cultured shrimps in Iran. In this study, Indian white shrimp, Fenneropenaeus indicus, with a weight of 11.79 ± 1.76 grams were fed with diets containing 0, 20, 50, 100, 200, 400, 800 and 1600 ppb levels of AFB1 for 8 weeks. Growth performances, survival rate, residue in muscles and cephalothorax, hematological and histopathological changes were determined after 4 and 8 weeks. The results showed that after 8 week of feeding shrimps with values of 20, 50 and 100 ppb aflatoxin B1, did not affect the growth rate, but with increased levels of Aflatoxin B1 in feed, the growth is reduced and the correlation (r) minus the final weight equal to - 0.312. After eight weeks doses of AFB1 in the diets showed negative correlation to the survival rate, total haemocyte count (THC), total plasma protein (TPP) equal to -0.603, -0.237 and -0.649 respectively. Histopathological changes were variety necrosis, degeneration and atrophy of epithelial and secretory cells lining the tubules, infiltration of fibroblasts in the walls of hepatopancreas tubules, separated muscle bundles in Muscle tissues and intestinal mucosal necrosis and detachment. Possible amelioration was examined by feeding control and treated shrimp (after eight weeks exposure to AFB1) by dietary without AFB1 for four weeks. The Recovery was observed in all parameters of 20, 50, 100 and 200 ppb AFB1 treatments but shrimps fed with the 1600 ppb and 800 ppb concentrations of AFB1 exhibited slower growth, more reddish discoloration disseminated over the body and lack of consistency in the hepatopancreas at 4th week recovery period. After eight weeks, the highest level of aflatoxin B1 residues in shrimp muscles was observed in 100 ppb treatment that its value was 1.55 ppb, but the highest level of aflatoxin B1 residues in cephalothorax was observed in 1600 ppb treatment that its value was 7.1 ppb. In terms of public health, these amounts of aflatoxin in shrimp body are less than permissible limit for human consumption.
    Keywords: Aquaculture ; Health ; Iran ; Persian Gulf ; Bushehr ; Fungus ; Mycotoxin ; Shrimp ; Fenneropenaeus indicus ; Tissue ; Survival
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 88
    Location Call Number Expected Availability
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    PAPER (OA)
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