Role of Non‐Exploited Fishery Resources in Sri Lankan Reservoirs as a Source of Food for Cage Aquaculture

Amarasinghe, U.S.; Kumara, P.A.D. Ajith; Ariyaratne, M.H.S.

doi:10.1002/9780470995679.ch27

Cited by 6 publications

(6 citation statements)

References 13 publications

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“…The species having high P/B ratios (i.e., high turnover rates) are known to be able to withstand heavy fishing pressure. As such, SIS in reservoirs can be expected to support productive fisheries as suggested by Amarasinghe et al (2002).…”

Section: Discussionmentioning

confidence: 98%

“…Present study therefore confirms the hypothesis that exploitation of SIS using small mesh gillnets would not make stocked fingerlings vulnerable for getting caught. Amarasinghe et al (2002) have demonstrated that SIS in Sri Lankan reservoirs have high production per biomass (P/B) ratios compared to those which are exploited by the commercial reservoir fisheries. The species having high P/B ratios (i.e., high turnover rates) are known to be able to withstand heavy fishing pressure.…”

Section: Discussionmentioning

confidence: 99%

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Gillnetting for small indigenous cyprinids in a Sri Lankan reservoir where culture-based fisheries are practiced

Athukorala

Amarasinbghe

2020

Sri Lanka J. Aquat.

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In Sri Lankan reservoirs, small, indigenous fish species (SIS) are abundant and can be differentially exploited using small mesh (15-38 mm stretched mesh sizes) gillnets without any detrimental effects on the cichlid fisheries. However, in the recent past a paradigm shift in the reservoir fisheries of Sri Lanka is observed from total dependence on exotic cichlids to exploitation of exotic carps, stocked in reservoirs for the development of culture-based fisheries (CBF). As fingerlings of Chinese and Indian major carps and common carp are regularly stocked in reservoirs for the development of CBF, it is essential to investigate the potential impact of the use of small mesh gillnets to catch SIS on stocked fish fingerlings on CBF. In the present study, small mesh gillnets were used to exploit SIS during September 2011 to March 2013 when carp fingerlings were stocked in Chandrika wewa, Sri Lanka. The results revealed that no carp fingerlings (except 2 specimens of Indian carp species) were caught in any of the fishing trials with small mesh gillnets. As juvenile fish and stocked fish fingerlings occur in shallow littoral areas of reservoir, and as small mesh gillnets are laid at the depths ≥ 1.5 m, there is a habitat segregation of these two categories of fish. It is therefore possible to introduce a subsidiary fishery with small mesh gillnets to exploit SIS, which can co-exist with CBF in reservoirs of Sri Lanka.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Gillnetting for small indigenous cyprinids in a Sri Lankan reservoir where culture-based fisheries are practiced

Athukorala

Amarasinbghe

2020

Sri Lanka J. Aquat.

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“…Amarasinghe et al . () have reported that, as these species exhibit high turnover rates, they can withstand high levels of exploitation. Thus, the present study provides a further insight into viewing the importance of reservoir fisheries management from the perspective of the entire fish community, which plays a major role in trophic dynamics in reservoir ecosystems, rather than considering only that part of the fish community being exploited by reservoir fishers.…”

Section: Discussionmentioning

confidence: 99%

Food‐web patterns and diversity in tropical fish communities

et al. 2014

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We compared the food webs of three Sri Lankan reservoirs: Minneriya (ancient and shallow; Udawalawe (young and shallow) and Victoria (young and deep). Species richness of the fish community was highest in Minneriya (30 species), intermediate in Udawalawe (21 species) and lowest in Victoria (18 species). Fish species belonged to 11 families, with Cyprinidae dominating the community both in terms of abundance and species richness. We used the daily amount of food consumed per fish species to distinguish weak from strong trophic interactions in these food webs. The fish community consumption pattern was characterized by a few strong interactions and many weak ones. The number of major consumers (contributing > 5% of the total fish community consumption) in each reservoir was small and similar for the three reservoirs. Puntius filamentosus 1 and Amblypharyngodon melettinus were the two major consumers in all three food webs. Puntius chola was a major consumer in Minneriya andVictoria, but not in Udawalawe, where it was feeding less on detritus than in the other two food webs. In all three reservoirs was the fish community mainly feeding at the bottom of the food web, on algae, macrophytes and detritus, with very little piscivory taking place. Average food web length was measured as the mean trophic index weighted for the consumption rates of the various fish populations which together compose the fish community. In comparison with most other tropical lake/reservoir food webs in Asia and Africa, of which data were available, was the average food web length in the Sri Lankan reservoirs relatively short. Furthermore, traditionally unexploited species, as opposed to species of commercial fisheries interest, Oreochromis mossambicus and O. niloticus, are major role players in trophic dynamics of reservoir ecosystems. As such, the potential of their exploitations should be considered in the management of reservoir fisheries.

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“…Research on postharvest technology for this untapped fishery resource is also needed to improve consumer acceptance . Small indigenous cyprinids can also be used to prepare feeds in aquaculture systems and livestock industry (Amarasinghe et al 2002). Evidence is found in other south Asian countries such as Bangladesh that small indigenous fish species have significantly high potential for contributing to human nutrition, especially due to the reason that some species such as Amblypharyngodon mola are found to be rich in vitamin A (Roos et al 2007).…”

Section: Unexploited Fishery Resources In Inland Watersmentioning

confidence: 99%

Fisheries resources in alleviation of hunger and malnutrition in Sri Lanka - accomplishment and challenges

Amarasinghe

2014

Sri Lanka J. Aquat.

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Sri Lanka is reputed as a country with better basic health indicators than most countries with comparable per capita incomes, but child under-nutrition in the country is very high. Fisheries sector plays a significant role in alleviating hunger and malnutrition because about 70% of animal protein of the diets of people comes from this sector. Currently per capita fish consumption in Sri Lanka is 13 kg per annum. Nevertheless, there is a significant potential to increase this value. Marine fisheries production forms about 86% of national fish production, but potential for its further increase is remote except for a few under-exploited fish stocks such as those attracted to flotsam. The inland fisheries sub-sector, on the other hand, has a great potential for development through further expansion of culture-based fisheries (CBF) in small village reservoirs for which there are legal provisions for agricultural farmers to utilize them for CBF development. With increased demand for fish fingerlings for CBF, there is an urgent need for training rural farmers to establish mini-hatcheries and induced breeding techniques of major carps. There appears to be a high potential for exploiting small indigenous fish species which have been unexploited hitherto, in reservoirs of Sri Lanka. As such, the fishery regulations with the legal provisions to exploit these indigenous fish populations should be implemented through active participation of fisher communities. The inland fishery is a source of animal protein for rural poor available at affordable prices. Hence, development of this sector is imperative for eradicating hunger and malnutrition in the rural communities.

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Role of Non‐Exploited Fishery Resources in Sri Lankan Reservoirs as a Source of Food for Cage Aquaculture

Cited by 6 publications

References 13 publications

Gillnetting for small indigenous cyprinids in a Sri Lankan reservoir where culture-based fisheries are practiced

Gillnetting for small indigenous cyprinids in a Sri Lankan reservoir where culture-based fisheries are practiced

Food‐web patterns and diversity in tropical fish communities

Fisheries resources in alleviation of hunger and malnutrition in Sri Lanka - accomplishment and challenges

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