Global climate change has become a critical barrier in the twenty-first century and it alarms the marine fishermen to respond and react until conditions become more adverse.Interaction with climate by humans occurs at...Global climate change has become a critical barrier in the twenty-first century and it alarms the marine fishermen to respond and react until conditions become more adverse.Interaction with climate by humans occurs at all levels,but recent research has focused on industries,technological and demographic aspects.So far,less attention has been paid to investigate the factors which affect perception and decision-making at the individual level.The uncertain condition of climate on marine fisheries from the last two decades had created drastic change in ecosystems as well as in the fishers’livelihood.Fishers are the group who first experiences the bitter conditions of climate change on marine fisheries because their livelihood depends highly on the marine resources.Therefore,the fishers’perception about the consequences of climate change on fisheries may help to emerge the fisheries by implicating certain productive management measures.The research has been carried out in the two southern coastal districts of Ramanathapuram and Kanyakumari,Tamil Nadu state to find out the fishers’perception of the consequences of climate change on fisheries.A sample size consisting of 120 marine fishermen were randomly selected and interviewed.The results inferred that increase in cost of fishing,increase in fishing investments,decline in fishing days,reduction in fish diversity and fish catches were the major consequences faced by fishers due to the climate change.展开更多
Invasive alien species are one of the greatest threats to biodiversity and ecosystem globally,affecting delivery of ecosystem goods and services,and consequently human well-being.Oreochromis niloticus is one of the mo...Invasive alien species are one of the greatest threats to biodiversity and ecosystem globally,affecting delivery of ecosystem goods and services,and consequently human well-being.Oreochromis niloticus is one of the most highly successful invaders of aquatic ecosystems with competitive characteristic advantages over indigenous species.The aim of this study was to investigate the potential presence and impact of O.niloticus on Mitukutuku fishery.The study was undertaken using fisheries independent surveys for the period of 2 months.Fish identification key and gel electrophoresis identification methods were also used to confirm presence of O.niloticus and also possible hybridization with indigenous congeneric species.Fisheries dependent survey was conducted with fishers and traders to further assess presence of the invasive species and its impacts on their catches and socio-economic well-being.A total of 32 Oreochromis hybrids species and 19 of O.niloticus were found in the reservoir.This confirmed a higher proportion of O.niloticus in the reservoir.Results from interviews of fishers and traders revealed catch per unit effort of O.hybrids and O.niloticus to be higher compared to that of indigenous congeneric species.Similarly,fish traders confirmed that income for the fish sales increased from 5%in March to 7%in August.Overall,these results suggested that O.niloticus does not only exist in Mitukutuku reservoir,but also hybridizes with native species and dominates the entire stretch of the reservoir threatening loss of biodiversity and aquaculture breeding programme.There is need for restricting culture of O.niloticus in Zambia.展开更多
基金The authors are grateful to all the authorities ofTamil Nadu Dr. J. Jayalalithaa Fisheries University,Nagapattinam, India for having provided the opportunityto conduct master’s research programme in fisheriesextension. The authors are thankful to Dr. G. Arul Oli,assistant professor, Dr. V. Kanaga, teaching assistantand postgraduate students, Miss Vishaka Gurung, Mr.Shetty Shivashankar, Mr. T. Iyyappan and Mrs.Thriveni Kasukurthi, of the Department of FisheriesExtension, Economics and Statistics, FisheriesCollege and Research Institute, Thoothukudi forproviding the necessary support and guidance. The authors are also indebted to the reviewers of thisarticle for providing comments, suggestions andresponsive for errors remaining.
文摘Global climate change has become a critical barrier in the twenty-first century and it alarms the marine fishermen to respond and react until conditions become more adverse.Interaction with climate by humans occurs at all levels,but recent research has focused on industries,technological and demographic aspects.So far,less attention has been paid to investigate the factors which affect perception and decision-making at the individual level.The uncertain condition of climate on marine fisheries from the last two decades had created drastic change in ecosystems as well as in the fishers’livelihood.Fishers are the group who first experiences the bitter conditions of climate change on marine fisheries because their livelihood depends highly on the marine resources.Therefore,the fishers’perception about the consequences of climate change on fisheries may help to emerge the fisheries by implicating certain productive management measures.The research has been carried out in the two southern coastal districts of Ramanathapuram and Kanyakumari,Tamil Nadu state to find out the fishers’perception of the consequences of climate change on fisheries.A sample size consisting of 120 marine fishermen were randomly selected and interviewed.The results inferred that increase in cost of fishing,increase in fishing investments,decline in fishing days,reduction in fish diversity and fish catches were the major consequences faced by fishers due to the climate change.
文摘Invasive alien species are one of the greatest threats to biodiversity and ecosystem globally,affecting delivery of ecosystem goods and services,and consequently human well-being.Oreochromis niloticus is one of the most highly successful invaders of aquatic ecosystems with competitive characteristic advantages over indigenous species.The aim of this study was to investigate the potential presence and impact of O.niloticus on Mitukutuku fishery.The study was undertaken using fisheries independent surveys for the period of 2 months.Fish identification key and gel electrophoresis identification methods were also used to confirm presence of O.niloticus and also possible hybridization with indigenous congeneric species.Fisheries dependent survey was conducted with fishers and traders to further assess presence of the invasive species and its impacts on their catches and socio-economic well-being.A total of 32 Oreochromis hybrids species and 19 of O.niloticus were found in the reservoir.This confirmed a higher proportion of O.niloticus in the reservoir.Results from interviews of fishers and traders revealed catch per unit effort of O.hybrids and O.niloticus to be higher compared to that of indigenous congeneric species.Similarly,fish traders confirmed that income for the fish sales increased from 5%in March to 7%in August.Overall,these results suggested that O.niloticus does not only exist in Mitukutuku reservoir,but also hybridizes with native species and dominates the entire stretch of the reservoir threatening loss of biodiversity and aquaculture breeding programme.There is need for restricting culture of O.niloticus in Zambia.
