Pub Date : 2016-07-08DOI: 10.4172/2150-3508.1000E125
Kevin C. Owen
A number of technologies exist that offer the potential to control Harmful Algal Blooms (HABs). Many of these technologies involved the discharge of solids, chemicals, biological agents, or other foreign materials into waters experiencing HABS. Other technologies are also available that could control HABS through the manipulation of environmental conditions such as water salinity, temperature, light intensity and stratification These potential control technologies would essentially accelerate or amplify the development of natural processes that terminate HABs. These technologies can be implemented over the entire range of conditions under which HABs occur and could limit the adverse environmental impacts to other organisms in the HAB impacted area. One of these potential technologies involve the application of the hypersaline concentrate waste water from desalination plants over an area impacted by a HAB. The near surface discharge of the desalination plant hypersaline waste water could an effective means of HAB control by inducing rapid changes in water salinity and stratification. The expected environmental impacts would be temporary, limited in both duration and areal extent. No foreign chemicals, materials, substances, organisms or biological agents would be introduced into the environment. Added benefits would include the beneficial reuse of the hypersaline waste water from desalination plants, reduction of waste water loading to the local area of the desalination plant, and the potential to generate revenue for the desalination plants by the sale of waste water.
{"title":"The Beneficial Reuse of Hypersaline Waste Water from Desalination Plants to Treat Harmful Algal Blooms","authors":"Kevin C. Owen","doi":"10.4172/2150-3508.1000E125","DOIUrl":"https://doi.org/10.4172/2150-3508.1000E125","url":null,"abstract":"A number of technologies exist that offer the potential to control Harmful Algal Blooms (HABs). Many of these technologies involved the discharge of solids, chemicals, biological agents, or other foreign materials into waters experiencing HABS. Other technologies are also available that could control HABS through the manipulation of environmental conditions such as water salinity, temperature, light intensity and stratification These potential control technologies would essentially accelerate or amplify the development of natural processes that terminate HABs. These technologies can be implemented over the entire range of conditions under which HABs occur and could limit the adverse environmental impacts to other organisms in the HAB impacted area. One of these potential technologies involve the application of the hypersaline concentrate waste water from desalination plants over an area impacted by a HAB. The near surface discharge of the desalination plant hypersaline waste water could an effective means of HAB control by inducing rapid changes in water salinity and stratification. The expected environmental impacts would be temporary, limited in both duration and areal extent. No foreign chemicals, materials, substances, organisms or biological agents would be introduced into the environment. Added benefits would include the beneficial reuse of the hypersaline waste water from desalination plants, reduction of waste water loading to the local area of the desalination plant, and the potential to generate revenue for the desalination plants by the sale of waste water.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126179260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-30DOI: 10.4172/2150-3508.1000172
Tombi Jeannette, A. J. Francis, Mieguim Ngninpogni Dominique, B. Félix
From February 2012 to February 2013, 406 fish were caught in the Melen fish station, then fixed in 10% formalin and taken to the laboratory to be examined. Mounting of monogeneans carried out using binocular magnifying glass; the determination of the various species was further done using the optical microscope. The colonization of the four pairs of arches by C. thurstonae occurred in the anterio-posterior direction. The other three species showed non-specific model of occupation of the transversal gradient. These different patterns have undergone permanent modifications. The results obtained in this study could be explained based on the heterogeneity of the gill system, the ventilation of current flow, the model of gills colonization by the oncomiracidiums of the Monopisthocotylea. The low diversity values obtained within seasons indicate that this period is harmful for the parasites studied. The species C. halli has exploited the resource space better in all. The populating of arches II and III were the best organized.
{"title":"Longitudinal Exploitation of the Transversal Gradient of Oreochromis niloticus Gill System by Four Monogeneans Species at Melen Fish Station (Yaounde, Cameroon)","authors":"Tombi Jeannette, A. J. Francis, Mieguim Ngninpogni Dominique, B. Félix","doi":"10.4172/2150-3508.1000172","DOIUrl":"https://doi.org/10.4172/2150-3508.1000172","url":null,"abstract":"From February 2012 to February 2013, 406 fish were caught in the Melen fish station, then fixed in 10% formalin and taken to the laboratory to be examined. Mounting of monogeneans carried out using binocular magnifying glass; the determination of the various species was further done using the optical microscope. The colonization of the four pairs of arches by C. thurstonae occurred in the anterio-posterior direction. The other three species showed non-specific model of occupation of the transversal gradient. These different patterns have undergone permanent modifications. The results obtained in this study could be explained based on the heterogeneity of the gill system, the ventilation of current flow, the model of gills colonization by the oncomiracidiums of the Monopisthocotylea. The low diversity values obtained within seasons indicate that this period is harmful for the parasites studied. The species C. halli has exploited the resource space better in all. The populating of arches II and III were the best organized.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125005080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-16DOI: 10.4172/2150-3508.1000171
M. Latuihamallo, J. W. Loupatty, G. Manuputty
The aim of this research was to analyse the proximate in natural foods Gracilaria lichenoides and Ulva fasciata for abalone Haliotis squamata. The proximate analysis included water, ash, protein, crude fibre, and lipid components. The proximate of Ulva fasciata were 82.0% of water, 25.7% of ash, 3.5% of protein, 4.8% of crude fibre, and 1.7% of lipid, while in Gracilaria lichenoides were 92.5% of water, 50.3% of ash, 2% of protein, 4.4% of crude fibre, and 1.2% of lipids. Natural food Ulva fasciata provides better result of growth of abalone due to the nutrients contained in it particularly the higher value of amino acids and fatty acids compared to natural food Gracilaria lichenoides.
{"title":"The Proximate of Natural Foods Gracilaria lichenoides and Ulva fasciata for Abalone Haliotis squamata Culture","authors":"M. Latuihamallo, J. W. Loupatty, G. Manuputty","doi":"10.4172/2150-3508.1000171","DOIUrl":"https://doi.org/10.4172/2150-3508.1000171","url":null,"abstract":"The aim of this research was to analyse the proximate in natural foods Gracilaria lichenoides and Ulva fasciata for abalone Haliotis squamata. The proximate analysis included water, ash, protein, crude fibre, and lipid components. The proximate of Ulva fasciata were 82.0% of water, 25.7% of ash, 3.5% of protein, 4.8% of crude fibre, and 1.7% of lipid, while in Gracilaria lichenoides were 92.5% of water, 50.3% of ash, 2% of protein, 4.4% of crude fibre, and 1.2% of lipids. Natural food Ulva fasciata provides better result of growth of abalone due to the nutrients contained in it particularly the higher value of amino acids and fatty acids compared to natural food Gracilaria lichenoides.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"28 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116717055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-12DOI: 10.4172/2150-3508.1000170
I. Gupta, Samir K. Banerjee
Cirrhinus reba is a commercially important freshwater cyprinid fish which has good demand as a table fish due to good amount of protein, fat and carbohydrate content in its flesh. Recently due to numbers of reasons like over harvesting, loss of habitat and ecological changes in its habitat, populations of this fish species have been declined in their nature. This fish species has already been enlisted as vulnerable species both in India and Bangladesh. Earlier considerable research has been conducted on different aspects of feeding and reproductive biology of this fish species but so far no such consolidated report is available on these two aspects. This review report aims to sum up the so far available information on these particular aspects of this threatened fish species as well as to point out some possible measures that to be considered to promote its conservation.
{"title":"A Review on Feeding and Reproductive Biology of Cirrhinus reba (Hamilton,1822), A Threatened Freshwater Fish of Indian Subcontinent with an Emphasis on its Conservation","authors":"I. Gupta, Samir K. Banerjee","doi":"10.4172/2150-3508.1000170","DOIUrl":"https://doi.org/10.4172/2150-3508.1000170","url":null,"abstract":"Cirrhinus reba is a commercially important freshwater cyprinid fish which has good demand as a table fish due to good amount of protein, fat and carbohydrate content in its flesh. Recently due to numbers of reasons like over harvesting, loss of habitat and ecological changes in its habitat, populations of this fish species have been declined in their nature. This fish species has already been enlisted as vulnerable species both in India and Bangladesh. Earlier considerable research has been conducted on different aspects of feeding and reproductive biology of this fish species but so far no such consolidated report is available on these two aspects. This review report aims to sum up the so far available information on these particular aspects of this threatened fish species as well as to point out some possible measures that to be considered to promote its conservation.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127418395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-10DOI: 10.4172/2150-3508.1000173
Kyuji Watanabe
We developed an in-season forecast model of return of chum salmon for the population off the Honshu region in the Sea of Japan using the smoothing spline based on catch data obtained in fishing season. The optimal in-season model was constructed using adult return in season 8 (middle October) as an explanatory variable. Residual sum of squares of the optimal in-season model was lower than that of the pre-season forecast (sibling) model, indicating the former was more accurate than the latter. The relationship between forecast error rate in the optimal model and the cumulative proportion of return until season 8 (middle October) was positive. Yearly variation in the forecast error rate may be affected by variability in the timing of return. We provide a new and accurate forecast model of chum salmon return.
{"title":"In-season Forecast of Chum Salmon Return Using Smoothing Spline","authors":"Kyuji Watanabe","doi":"10.4172/2150-3508.1000173","DOIUrl":"https://doi.org/10.4172/2150-3508.1000173","url":null,"abstract":"We developed an in-season forecast model of return of chum salmon for the population off the Honshu region in the Sea of Japan using the smoothing spline based on catch data obtained in fishing season. The optimal in-season model was constructed using adult return in season 8 (middle October) as an explanatory variable. Residual sum of squares of the optimal in-season model was lower than that of the pre-season forecast (sibling) model, indicating the former was more accurate than the latter. The relationship between forecast error rate in the optimal model and the cumulative proportion of return until season 8 (middle October) was positive. Yearly variation in the forecast error rate may be affected by variability in the timing of return. We provide a new and accurate forecast model of chum salmon return.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132644297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-09DOI: 10.4172/2150-3508.1000169
S. Bergmann, M. Cieslak, D. Fichtner, J. Dabels, S. Monaghan, Qing Wang, Weiwei Zeng, J. Kempter
Most diseases induced by herpesviruses are host-specific; however, exceptions exist within the family Alloherpesviridae. Most members of the Alloherpesviridae are detected in at least two different species, with and without clinical signs of a disease. In the current study the Koi herpesvirus (KHV) was used as a model member of the Alloherpesviridae and rainbow trout as a model salmonid host, which were infected with KHV by immersion. KHV was detected using direct methods (qPCR and semi-nested PCR) and indirect (enzyme-linked immunosorbant assay; ELISA, serum neutralization test; SNT). The non-koi herpesvirus disease (KHVD)-susceptible salmonid fish were demonstrated to transfer KHV to naive carp at two different temperatures including a temperature most suitable for the salmonid (15°C) and cyprinid (20°C). At 20°C KHVD was induced in carp cohabitated with infected trout. KHV was also detected virologically and serologically at the end of the experiment in both rainbow trout and carp.
{"title":"Is There Any Species Specificity in Infections with Aquatic Animal Herpesviruses?-The Koi Herpesvirus (KHV): An Alloherpesvirus Model","authors":"S. Bergmann, M. Cieslak, D. Fichtner, J. Dabels, S. Monaghan, Qing Wang, Weiwei Zeng, J. Kempter","doi":"10.4172/2150-3508.1000169","DOIUrl":"https://doi.org/10.4172/2150-3508.1000169","url":null,"abstract":"Most diseases induced by herpesviruses are host-specific; however, exceptions exist within the family Alloherpesviridae. Most members of the Alloherpesviridae are detected in at least two different species, with and without clinical signs of a disease. In the current study the Koi herpesvirus (KHV) was used as a model member of the Alloherpesviridae and rainbow trout as a model salmonid host, which were infected with KHV by immersion. KHV was detected using direct methods (qPCR and semi-nested PCR) and indirect (enzyme-linked immunosorbant assay; ELISA, serum neutralization test; SNT). The non-koi herpesvirus disease (KHVD)-susceptible salmonid fish were demonstrated to transfer KHV to naive carp at two different temperatures including a temperature most suitable for the salmonid (15°C) and cyprinid (20°C). At 20°C KHVD was induced in carp cohabitated with infected trout. KHV was also detected virologically and serologically at the end of the experiment in both rainbow trout and carp.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"147 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127568961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-04-28DOI: 10.4172/2150-3508.1000168
J. Sarker, Borhan Uddin Amm, Shamsul Alam Patwary, M. Tanmay, Farhana Rahman
The present study aimed to elucidate the livelihood status of Hilsa (Tenualosa ilisha) fishermen at Lakshmipur and Noahkali Districts in Bangladesh during August, 2014 to January, 2015 through questionnaire survey method. During Hilsa fishing, Pangas (Pangasius pangasius), Koral (Lates calcarifer) and Poa (Johnius coitor) were also found to capture as bycatch using Chandi Jal (set gill net). 85% fishermen were observed to use mechanized (5-40 HP; Horse Power) boats in the study areas. Hilsa fishing was noticed mostly during October-November while such activities was almost absent during February-May (off period) which made fishermen to start migrating temporarily to the nearest urban areas for their livelihood. Although the Government of Bangladesh formulates an act to have fishing license yet 20% of the fishermen were found having valid fishing license in the study areas. Average daily net income of the fishermen during fishing period was 600 BDT whereas their real field daily income through fishing supposed to be 1695 BDT if they are supported by nets, boats, fuels etc. which means almost 64% of their daily income is taken by the aratdars. Therefore, subsidy as a means of nets, boats, fuels, engines etc. might be recommended for the better livelihood of the fishermen in greater Noakhali region.
{"title":"Livelihood Status of Hilsa (Tenualosa ilisha) Fishermen of Greater Noakhali Regions of Bangladesh","authors":"J. Sarker, Borhan Uddin Amm, Shamsul Alam Patwary, M. Tanmay, Farhana Rahman","doi":"10.4172/2150-3508.1000168","DOIUrl":"https://doi.org/10.4172/2150-3508.1000168","url":null,"abstract":"The present study aimed to elucidate the livelihood status of Hilsa (Tenualosa ilisha) fishermen at Lakshmipur and Noahkali Districts in Bangladesh during August, 2014 to January, 2015 through questionnaire survey method. During Hilsa fishing, Pangas (Pangasius pangasius), Koral (Lates calcarifer) and Poa (Johnius coitor) were also found to capture as bycatch using Chandi Jal (set gill net). 85% fishermen were observed to use mechanized (5-40 HP; Horse Power) boats in the study areas. Hilsa fishing was noticed mostly during October-November while such activities was almost absent during February-May (off period) which made fishermen to start migrating temporarily to the nearest urban areas for their livelihood. Although the Government of Bangladesh formulates an act to have fishing license yet 20% of the fishermen were found having valid fishing license in the study areas. Average daily net income of the fishermen during fishing period was 600 BDT whereas their real field daily income through fishing supposed to be 1695 BDT if they are supported by nets, boats, fuels etc. which means almost 64% of their daily income is taken by the aratdars. Therefore, subsidy as a means of nets, boats, fuels, engines etc. might be recommended for the better livelihood of the fishermen in greater Noakhali region.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123454126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-04-22DOI: 10.4172/2150-3508.1000167
M. Thiaw, M. Tine, H. D. Diadhiou, Oualbadet Magoma, P. Brehmer
A fisheries management plan was required in Central Africa, which integrated a reduced regional hydrographical network and limited amounts of data in the overall regime. The current data and knowledge on fish populations and fisheries impacts are very poor in this region, particularly in Chad. Therefore, any new knowledge, especially on the structure of the ichthyological stands can be considered as valuable. Information on the status of Lake Iro fisheries resources was thus established by this study, which can serve as a model fisheries management regime in Central Africa. We performed assessment of fish resources in Lake Iro, Chad, achieved by a characterization of the exploited ichthyofauna, and the location of nursery and fishing areas. Results indicated that the overall size range of fish species showed negative effects of fishing pressure on size structure of the fish resources. Fishing has increasingly exerted pressure on fish species and affected the primary consumer species. We hypothesized at Lake Iro fish catches were below optimal fish production levels, essentially due to excessive localized fishing efforts, and selective fishing techniques by fisherman. Such reports call for the development of an integrated plan for sustainable management of Lake Iro fisheries resources. Sustainable and equitable exploitation of Lake Iro resources can be promoted by implementation of the following recommendation: a protected area at the lake inlet to limit excessive juvenile fish catches, which disturbs the aquatic food chain and prevents juvenile fish supply and growth in Lake Iro.
{"title":"Shift of Small Scale Fishing Impacts on Fish Trophic Levels in Lake Iro Revealed by Species-Based Indicators","authors":"M. Thiaw, M. Tine, H. D. Diadhiou, Oualbadet Magoma, P. Brehmer","doi":"10.4172/2150-3508.1000167","DOIUrl":"https://doi.org/10.4172/2150-3508.1000167","url":null,"abstract":"A fisheries management plan was required in Central Africa, which integrated a reduced regional hydrographical network and limited amounts of data in the overall regime. The current data and knowledge on fish populations and fisheries impacts are very poor in this region, particularly in Chad. Therefore, any new knowledge, especially on the structure of the ichthyological stands can be considered as valuable. Information on the status of Lake Iro fisheries resources was thus established by this study, which can serve as a model fisheries management regime in Central Africa. We performed assessment of fish resources in Lake Iro, Chad, achieved by a characterization of the exploited ichthyofauna, and the location of nursery and fishing areas. Results indicated that the overall size range of fish species showed negative effects of fishing pressure on size structure of the fish resources. Fishing has increasingly exerted pressure on fish species and affected the primary consumer species. We hypothesized at Lake Iro fish catches were below optimal fish production levels, essentially due to excessive localized fishing efforts, and selective fishing techniques by fisherman. Such reports call for the development of an integrated plan for sustainable management of Lake Iro fisheries resources. Sustainable and equitable exploitation of Lake Iro resources can be promoted by implementation of the following recommendation: a protected area at the lake inlet to limit excessive juvenile fish catches, which disturbs the aquatic food chain and prevents juvenile fish supply and growth in Lake Iro.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"196 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115237986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-04-21DOI: 10.4172/2150-3508.1000166
Jianpeng Peng, A. Lian, Q. Jiang
Somatolactin (SL), the member of the growth hormone (GH)/prolactin (PRL) family, is fish-specific pituitary hormone with diverse functions. However, little is known about its biological function in fish hepatocytes. Using tilapia as a model, SLtranscripts were shown to be widely expressed in various extrapituitary tissues with the relatively high expression level in liver. To explore the biological action of SL in hepatocytes, we produced and purified recombinant tilapia SL protein which could induce pigment aggregation in tilapia melanophores. Further, the antiserum for the SL was produced and its specificity was confirmed by antiserum preabsorption. During 4 week starvation, hepatic SL transcripts in starved fish were significantly higher than the control fish starting on the 1st week of starvation until 4th week. After re-feeding, the SL transcripts level returned to normal. Using primary cultures of tilapia hepatocytes, insulin-like growth factors (IGF1 and IGF2) gene expression were elevated by static incubation with recombinant tilapia SL. In contrast, removal endogenous SL by immunoneutralization using SL antiserum was shown to inhibit IGF1 and IGFgene expression. These findings, taken together, provide evidence for the first time that SL may serve as a novel regulator in fish stimulating IGF1 and IGF gene expression in hepatocytes.
{"title":"Production and Purification of Recombinant Somatolactin and its Effects on Insulin-like Growth Factors Gene Expression in Tilapia Hepatocytes","authors":"Jianpeng Peng, A. Lian, Q. Jiang","doi":"10.4172/2150-3508.1000166","DOIUrl":"https://doi.org/10.4172/2150-3508.1000166","url":null,"abstract":"Somatolactin (SL), the member of the growth hormone (GH)/prolactin (PRL) family, is fish-specific pituitary hormone with diverse functions. However, little is known about its biological function in fish hepatocytes. Using tilapia as a model, SLtranscripts were shown to be widely expressed in various extrapituitary tissues with the relatively high expression level in liver. To explore the biological action of SL in hepatocytes, we produced and purified recombinant tilapia SL protein which could induce pigment aggregation in tilapia melanophores. Further, the antiserum for the SL was produced and its specificity was confirmed by antiserum preabsorption. During 4 week starvation, hepatic SL transcripts in starved fish were significantly higher than the control fish starting on the 1st week of starvation until 4th week. After re-feeding, the SL transcripts level returned to normal. Using primary cultures of tilapia hepatocytes, insulin-like growth factors (IGF1 and IGF2) gene expression were elevated by static incubation with recombinant tilapia SL. In contrast, removal endogenous SL by immunoneutralization using SL antiserum was shown to inhibit IGF1 and IGFgene expression. These findings, taken together, provide evidence for the first time that SL may serve as a novel regulator in fish stimulating IGF1 and IGF gene expression in hepatocytes.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125482073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-04-20DOI: 10.4172/2150-3508.1000165
N. Bhouiyan, M. Baki, A. Sarkar, M. Hossain
Biodiversity of many Bangladesh Rivers is seriously threatened by industrial and municipal pollution. The study was conducted in the Turag River starting from Amin Bazar bridge (23°47' N 90°20'E) to Kamarpara bridge (23°53' N 90°23'E). This inventory survey was sampled at a fortnightly interval usually between 7.00 am to 5.00 pm by a team using a boat from December 2012 to November 2013. Detailed information on catch by species, fish length & weight, different types of gear & craft were collected through direct observation. A total of 71 (65 indigenous and 6 exotic) fish species (under 25 families of 9 orders) have been identified. 17 different types of gears of two categories (active and passive gear) and 8 different types of crafts were observed to harvest fish in the study area. The survey revealed that rising floodwater stimulated an increase in fishing activities in the study area from July to October. Fish numbers were recorded lower from November to July (dry and pre-monsoon period) likely due to reduced water flow and adverse water quality of this river. A paired t-test indicate that fish species numbers were significantly difference between Dry and pre-monsoon (P=0.02), Dry and monsoon (P=0.02) and Dry and post-monsoon season (P=0.03) respectively. However, fisheries resources contribution is very limited for livelihood of the surrounding people.
{"title":"Inventory of Ichyofaunal Diversity, Fishing Gear and Craft in Turag River, Dhaka, Bangladesh","authors":"N. Bhouiyan, M. Baki, A. Sarkar, M. Hossain","doi":"10.4172/2150-3508.1000165","DOIUrl":"https://doi.org/10.4172/2150-3508.1000165","url":null,"abstract":"Biodiversity of many Bangladesh Rivers is seriously threatened by industrial and municipal pollution. The study was conducted in the Turag River starting from Amin Bazar bridge (23°47' N 90°20'E) to Kamarpara bridge (23°53' N 90°23'E). This inventory survey was sampled at a fortnightly interval usually between 7.00 am to 5.00 pm by a team using a boat from December 2012 to November 2013. Detailed information on catch by species, fish length & weight, different types of gear & craft were collected through direct observation. A total of 71 (65 indigenous and 6 exotic) fish species (under 25 families of 9 orders) have been identified. 17 different types of gears of two categories (active and passive gear) and 8 different types of crafts were observed to harvest fish in the study area. The survey revealed that rising floodwater stimulated an increase in fishing activities in the study area from July to October. Fish numbers were recorded lower from November to July (dry and pre-monsoon period) likely due to reduced water flow and adverse water quality of this river. A paired t-test indicate that fish species numbers were significantly difference between Dry and pre-monsoon (P=0.02), Dry and monsoon (P=0.02) and Dry and post-monsoon season (P=0.03) respectively. However, fisheries resources contribution is very limited for livelihood of the surrounding people.","PeriodicalId":166175,"journal":{"name":"Fisheries and Aquaculture Journal","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123594775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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