http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/5711 2026-04-07T13:35:56Z http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/1503 Title: Economic Loss of Northern Fishers due to the Poaching Activities of Indian Trawlers Authors: Vithursha, T.; Sivashanthini, K.; Gunaalan, K. Abstract: The present study was carried out to analyze the economic loss of Sri Lankan fishers due to the poaching activities by Indian trawlers. Fishery resources are major livelihoods in South Indian and North Sri Lankan people who have been fished in harmony since ancient time but the situation has gone upside down since early 90s. Because fish stocks on the Indian side were fast depleting due to over-exploitation, the number of Indian fishing vessels entering into Sri Lankan waters for fishing also rapidly increased. A survey was carried out at Karainagar, Point Pedro and Mathagal region from September 2015 to February 2016 in order to assess the economic loss of Sri Lankan fishers from indicated areas. Primary data related to yield lost, income lost and nautical lost were collected from 100 families by providing a pre-tested questionnaire and secondary data related to the economic lost were collected from co-operative societies of the respective regions. Collected data were subjected to descriptive statistical analysis and one-way analysis of variance. The highest yield lost was recorded in Point Pedro followed by Mathagal, which were being 435.20 ± 125.8 kg/month and 428.10 ± 120.0 kg/month respectively. Mathagal area faced significantly (P < 0.05) high amount of income lost (SLR/month 85, 571.00 ± 35,119.00) than the other area. The nautical lost in Karainagar, Point Pedro and Mathagal area were 8, 6 and 5 Nautical Miles respectively. Fishers living in Mathagal and Point Pedro area faced significantly (P < 0.05) high amount of economic lost by Indian trawlers than the Karainagar area. From the present study it can be concluded that the intrusion of Indian trawlers into the Sri Lankan territorial waters should be restricted in order to reduce the economic loss of the Sri Lankan fishers. 2019-01-01T00:00:00Z http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/1502 Title: Variations in Important Water Quality Parameters and Fish Species in Thondaimanaru Lagoon, Jaffna, Sri Lanka Authors: Shobiya, P.; Sivashanthini, K.; Sutharshiny, S.; Saruga, S.; Gunaalan, K. Abstract: Thondaimanaru lagoon is one of the shallow coastal lagoons in Jaffna peninsula. The current study was conducted to assess the present status of water quality and fish species composition of this lagoon. Water sampling was conducted from July 2016 to December 2016. Nine random samples were collected monthly in order to determine water temperature, pH, salinity, Dissolved Oxygen, Total Dissolved Solids and turbidity. A smarTROLL Multi parameter (Insitu 458389) was used to measure all the parameters except turbidity, which was measured by turbidity meter (2100Q HACH). Random samples of fishes were collected once a month. One-way ANOVA was used to perform statistical analysis. Water temperature, Dissolved Oxygen, salinity, Total Dissolved Solids and turbidity showed significant variations (p < 0.05) whereas pH value did not show a significant difference (p > 0.05) among the months. Chanos chanos, Hemirhamphus sp., Nematalosa nasus, Mugil cephalus, Liza parsia, Oreochromis mossambicus, Arius caelatus and Gerres lucidus were present throughout the study period. Results revealed that the important water quality parameters fluctuated due to seasonal environmental changes where shallow water depth of lagoon, rate of evaporation as well as precipitation had a significant influence on the water quality characteristics. 2019-01-01T00:00:00Z http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/1501 Title: Ecological Footprints for Aquaculture Possibility in Selected Mangrove Regions of Jaffna, Sri Lanka Authors: Saruga, S.; Sivashanthini, K.; Sutharshiny, S.; Gunaalan, K.; Shobiya, P. Abstract: The present study was carried out to analyze the possibility of practicing aquaculture in selected mangrove regions in Jaffna, Sri Lanka. A detailed study on the possibility of undertaking aquaculture has been carried out in Sarasaalai and Kapputhu mangrove regions. The water quality parameters were measured, organic matter was estimated and available fish species were collected and identified during the study period. Samples were collected in the second week of each month from June 2016 to November 2016. Water quality parameters such as water temperature, salinity, pH, dissolved oxygen, water depth and turbidity were measured. Organic matter was estimated for soil samples collected from the study areas. Water quality parameters were analyzed by two sample t-test using minitab13. Identification of all collected fish species were confirmed according to the standard literature by observing their morphological and meristic characters. Statistical analysis shows no significant difference between Sarasaalai and Kapputhu in water temperature (P = 0.062), salinity (P = 0.402), dissolved oxygen (P = 0.773), pH (P = 0.262) and water depth (P = 0.798). Significant difference (P = 0.001) was observed for turbidity in both locations. High percentage of organic matter was observed in Sarasaalai. The identified fish species in both locations were Chanos chanos, Platycephalus fuscus, Oreochromis mossambicus, Nematalosa nasus, Hyporhamphus limbatus, Hemiramphus marginatus, Etroplus maculatus, Gerres abbreviatus and Gerres oyena. The most abundant species found in Sarasaalai was O. mossambicus and in Kapputhu were O. mossambicus, C. chanos, G. abbreviatus and G. oyena. The present investigation inferred that the specified species can be cultured in the said regions. However, a long term study on seed resources, environmental and climatic conditions of particular site would ensure more details on culture aspects of these species. 2019-01-01T00:00:00Z http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/1500 Title: Heavy Metal Contamination and Accumulation in Groundwater and Food Crops in Sri Lanka: A Review Authors: Priyashantha, A. K. H.; Mahendranathan, C. Abstract: Heavy metal contamination in food crops and ground water lead toxic effects on living organisms through the interference of the metabolic pathways. In this paper, the prevailing scientific data, with regard to the accumulation of heavy metals in groundwater and food crops in Sri Lanka, were reviewed. Evidence revealed that the groundwater bodies in Sri Lanka are in safer level to be used for day-to-day activities with a few exceptions and however, the heavy metal accumulation in some food crops are beyond the permissible level. Chronic Kidney Disease of unknown aetiology is one of the emerging issues at present in dry zones, particularly in the North Central Province in Sri Lanka and its suspected due to the extensive use of agrochemicals which is believed to be contaminated with the heavy metals. 2019-01-01T00:00:00Z