Assessing impacts of introduced aquaculture species on native fish communities: Nile tilapia and major carps in SE Asian freshwaters

Fish Fauna Faces Anthropogenic Double Trouble: Erosion of Fish Diversity in Tropical Oxbow Lake of the Ganga River Basin in Eastern India

“…Low native fish diversity indices are pointers to poor ecosystem health status owing to intense adverse activities like jute retting, indiscriminate fishing aggravated by influx of turbid water from the river Ganga following episodic flood events during monsoon. The present findings on fish SWI and Simpson diversity values showed quite similarity with other studies [9,[13][14][15][16][17]19,21,24,25,45], in contrast with other studies [18,20,22,23,26,27].…”

“…Studies have been limited to scattered works on commercial fisheries [2][3][4][5][6][7][8][9][10][11], based on catch data of some major groups largely restricted to some of the major river systems [1,12]. Various fish diversity indices are reported in several studies [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

The Development of Sustainable Saltwater-Based Food Production Systems: A Review of Established and Novel Concepts

“…Accidental release of farmed fish into natural waters can lead to a number of ecological risks, including: increased competition for space, prey, and/or mates; pathogen, disease, and parasite transmission; interbreeding between farmed and wild fish resulting in reduced fitness of wild cousins or wild stock enhancement resulting in genetically distinct fish from their wild cousins; habitat damage; and water quality alterations [4,7,8,[53][54][55][56][57][58][59]. Many of the general features of successful invasive species (i.e., rapid growth, early sexual maturity, high genetic variability, broad environmental range, and a short generation time) are also common features of aquaculture species [4,7].…”

Tradeoffs among Ecosystem Services Associated with Global Tilapia Introductions

“…Examples of phrases that led to a score of "negative" included: "We therefore consider that O. niloticus poses an unacceptable risk to its congenerics in the Limpopo River system" (Zengeya et al, 2012), and "The species have become widely established, with a range of negative consequences for the rich natural fish fauna of this Central American country" (McCrary et al, 2007). Statements scored as "positive" included: "The general importance of tilapias to the Asian region is evident from the fact that the first ever, multination, selective breeding programme on a cultured finfish species in Asia was on O. niloticus" (De Silva et al, 2006) and "Use of these non-native tilapia and carp species in fisheries enhancement in mainland SE Asia supported substantial increases in harvestable biomass while having only mild impacts on native fish communities" (Arthur et al, 2010). In contrast, where authors acknowledged both significant benefits and harms, "both" was assigned.…”

“…Reductions in other ecosystem services caused by tilapia are associated with the loss of aquatic plants and the habitats they provide to native species (Crutchfield, 1995), as well as undesirable biotic and abiotic changes associated with eutrophication (Figueredo and Giani, 2005). In contrast, some tilapia fisheries may act to protect native species by removing fishing pressure from natives (Arthur et al, 2010).…”