Use of geographical information system and remote sensing techniques for planning culture‐based fisheries in non‐perennial reservoirs of Sri Lanka

Abstract

The presence of a wide areal extent of small‐sized village reservoirs offers a considerable potential for the development of culture‐based fisheries (CBFs) in Sri Lanka. To this end, this study uses geographical information systems (GISs) and remote sensing (RS) techniques to determine the morphometric and biological characteristics most useful for classifying non‐perennial reservoirs for CBF development and for assessing the influence of catchment land‐use patterns on potential CBF yields. The reservoir shorelines at full water supply level were mapped with a Global Positioning System to determine shoreline length and reservoir areal extent. The ratio of shoreline length to reservoir extent, which was reported to be a powerful predictor variable of CBF yields, could be reliably quantified using RS techniques. The areal extent of reservoirs, quantified with RS techniques (RS extent), was used to estimate the ratio of forest cover plus scrubland cover to RS extent and was found to be significantly related to the CBF yield (R2 = 0.400; P < 0.05). The results of this study indicated that morphometric characteristics and catchment land‐use patterns, which might be viewed as indices of biological productivity, can be quantified using RS and GIS techniques.

Fisheries enhancements in inland waters in Sri Lanka with special reference to culture based fisheries: current status and impacts

“…Comparison of gross income (GI) and profits per annum from downstream paddy cultivation and culture-based fisheries (CBF) in Ampara wewa, Hambegamuwa and Aluthdiulwewa during2012- 2014 (after Pushpalatha et al 2017 …”

Plankton biodiversity in various typologies of inundation in Paminggir peatland, South Kalimantan, Indonesia on dry season

“…Index of evenness was inverse to index of diversity so that the higher evenness was a temporary area. This opinion was supported by Wijenayake et al (2014); Chandrasoma and Pushpalatha (2018) that revealed the high index of diversity indicated that at this location it was feasible in terms of the availability of natural food for inland fisheries activities. On the other hand, temperature, sunlight, dissolved oxygen and pH were important components of plankton life and growth in various inundation.…”

Constraints in culture-based fisheries of Sri Lanka and strategies for future development

“…TSI (SD) = 60 -14.41 ln Secchi disk (metres) TSI (Chl) = 9.81 ln chlorophyll-a (mg/m 3 ) + 30.6 TSI (TP) = 14.42 ln total phosphorus (mg/m 3 ) + 4.15 Jayasinghe et al (2005) observed that in nonperennial reservoirs of Sri Lanka TSI (TP) = TST (SD) > TSI (SD) showing non-algal particles dominate light attenuation. Jayasinghe et al (2005) and Wijenayake et al (2014) also showed that CBF yields in non-perennial reservoirs of Sri Lanka were positively correlated to chlorophyll-a content. Furthermore, the ratio of forest cover plus scrubland cover in the catchment area to reservoir extent was also found to be significantly related to the chlorophyll-a content and the CBF yield (Wijenayake et al 2014).…”

“…Jayasinghe et al (2005) and Wijenayake et al (2014) also showed that CBF yields in non-perennial reservoirs of Sri Lanka were positively correlated to chlorophyll-a content. Furthermore, the ratio of forest cover plus scrubland cover in the catchment area to reservoir extent was also found to be significantly related to the chlorophyll-a content and the CBF yield (Wijenayake et al 2014).…”