Status of Chinese Carp Fisheries in Tunisian Freshwater Reservoirs: Threats and Opportunities
- 1 October 2021
- journal article
- Published by SciRes Literature LLC in Journal of Biomedical Research & Environmental Sciences
- Vol. 2 (10), 945-953
- https://doi.org/10.37871/jbres1336
Abstract
The current paper aims to diagnose the state of fisheries of three Chinese carp species whish have been introduced in Tunisian reservoirs since 1981: (silver carp Hypophthalmichthys molitrix, herbivorous carp Ctenopharyngodon idella and bighead carp Aristichthys nobilis) and seeks to study the benefits and risks associated with their introduction. Chinese carps cannot reproduce naturally in freshwater reservoirs. Eventually, artificial breeding operations and seeding of the dams with farm-produced fry are carried out by the Technical Centre of Aquaculture every year. Statistical analyses have shown a strong correlation between the landed quantity and the number of fries stocked each year. The impact assessment showed that the risks and benefits associated with the introduction of the three species are variable. Regarding their benefits, it was clear that the herbivorous carp has provided effective and sustainable control of the extensive development of aquatic vegetation in the eutrophic reservoirs and canal systems. The value of the other two species, though, remains less obvious, particularly for the bighead carp. The consequences of their introduction on ecosystems and native species seem to be negligible, especially when the densities are low. Eventually, it seems judicious to increase the stocking of the herbivorous carp, silver carp and bighead carp in Tunisian reservoirs.Keywords
This publication has 35 references indexed in Scilit:
- The top 27 animal alien species introduced into Europe for aquaculture and related activitiesJournal of Applied Ichthyology, 2010
- Reduced condition factor of two native fish species coincident with invasion of non‐native Asian carps in the Illinois River, U.S.A. Is this evidence for competition and reduced fitness?Journal of Fish Biology, 2007
- Small fish, big fish, red fish, blue fish: size‐biased extinction risk of the world's freshwater and marine fishesGlobal Ecology and Biogeography, 2007
- A general eco-evolutionary framework for understanding bioinvasionsTrends in Ecology & Evolution, 2006
- Global Documentation of Fish Introductions: the Growing Crisis and Recommendations for ActionBiological Invasions, 2006
- To be, or not to be, a non-native freshwater fish?Journal of Applied Ichthyology, 2005
- Nouvelle approche des biomanipulations des réseaux trophiques aquatiques. Introduction d'un poisson phytoplanctonophage, la carpe argentée (Hypophthalmichthys molitrix)L’Année Biologique, 1999
- Biological invasions of fresh water: Empirical rules and assembly theoryBiological Conservation, 1996
- Different systems of carp production and their impacts on the environmentAquaculture, 1995
- A note on the effect of lowered temperatures on the survival of eggs and fry of the grass carp Ctenopharyngodon idella (Valenciennes)Journal of Fish Biology, 1973