AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Ctenopharyngodon idella [WoRMS] | |
Authority | (Valenciennes, 1844) | |
Family | Cyprinidae | |
Order | Cypriniformes | |
Class | Actinopterygii | |
Phylum | Chordata | |
Synonym (?) | ||
Sub-species level (?) | Not entered |
Native origin (?) | Country: China Country: Russia References (not structured): Cudmore, B. M. N. E., Mandrak, N. E. 2004. Biological synopsis of grass carp (Ctenopharyngodon idella). Canadian manuscript report of fisheries and Aquatic Sciences, 2705(7), pp. 1-44. Comments: Eastern Asia from the Amur River of eastern Russia and China south to West River of southern China. |
Life form / Life stage (?) |
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Sociability / Life stage (?) |
Comments: They are gregarious and live in large shoals close to the water's surface. |
Reproductive frequency (?) | Iteroparous |
Reproductive type (?) | Sexual References: Cudmore, B. M. N. E., Mandrak, N. E. 2004. Biological synopsis of grass carp (Ctenopharyngodon idella). Canadian manuscript report of fisheries and Aquatic Sciences, 2705(7), pp. 1-44. Comments: Grass carp at maturity are approximately 50-86 cm in length. Males generally mature one year earlier than females. |
Developmental trait (?) | Spawning References: Cudmore, B. M. N. E., Mandrak, N. E. 2004. Biological synopsis of grass carp (Ctenopharyngodon idella). Canadian manuscript report of fisheries and Aquatic Sciences, 2705(7), pp. 1-44. Comments: Water temperature required for stimulation of sexual maturation and spawning ranges between 20°C and 30°C. Spawning usually takes place in spring and summer in the upper part of the water column over rapids or sand bars. |
Characteristic feeding method / Life stage (?) |
References (not structured): Cudmore, B. M. N. E., Mandrak, N. E. 2004. Biological synopsis of grass carp (Ctenopharyngodon idella). Canadian manuscript report of fisheries and Aquatic Sciences, 2705(7), pp. 1-44. Comments: Three or four days after hatching, larval grass carp begin feeding on rotifers and protozoans, moving up to larger cladocerans at 11-15 days post-hatch.By two weeks after hatching, and at sizes of 12-17 mm long, grass carp feed on larger prey, such as Daphnia and insect larvae. After three weeks, the occurrence of plants in the diet increases, with the appearance of filamentous algae and macrophytes.Juveniles will consume other items including chironomids, cladocerans, copepods, insects and small fishes. When macrophytes is low, adult grass carp are able to utilize other food sources including benthos, zooplankton, water beetles and crayfishes. |
Mobility / Life stage (?) |
References (not structured): Cudmore, B. M. N. E., Mandrak, N. E. 2004. Biological synopsis of grass carp (Ctenopharyngodon idella). Canadian manuscript report of fisheries and Aquatic Sciences, 2705(7), pp. 1-44. Comments: Grass carp eggs are 2.0-2.5 mm in diameter when released, but quickly swell to a diameter of 5-6 mm as water is absorbed. The eggs are semi-buoyant and non-adhesive, requiring well-oxygenated water and a current to keep them suspended until hatching. |
Salinity tolerance range (?) | Exact range: 0 - 8 References: Liu, D., Zhang, Z., Song, Y., Yang, J., Lu, Y., Lai, W., ... Li, S. 2023. Effects of salinity on growth, physiology, biochemistry and gut microbiota of juvenile grass carp (Ctenopharyngodon idella). Aquatic Toxicology, 258, 106482. Comments: Grass carp could survive at the range of 0∼8 ppt, and were most suitable for growth at a salinity lower than the SC (1.173). Grass carp showed good adaptability to low salinity (2 ppt), did not show a significant difference in growth and maintained a stable physiological and immune status. However, exposure to high salinity (6 ppt) produces significant deleterious effects, including growth inhibition as well as physiological and immune-related changes. |
Habitat modifying ability potential (?) | Allogenic ecosystem engineers References: Bozkurt, Y., Yavas, İ., Gül, A., Balcı, B. A., & Çetin, N. C. 2017. Importance of grass carp (Ctenopharyngodon idella) for controlling of aquatic vegetation. Grasses-Benefits, Diversities and Functional Roles, 3, 29. Comments: C. idella are good biological control agents for aquatic vegetation. |
Toxicity / Life stage (?) | Not relevant |
Bioaccumulation association (?) | Anthropogenic chemical compounds References: Ahmed, M. S., Aslam, Y., Khan, W. A. 2011. Absorption and bioaccumulation of water-borne inorganic mercury in the fingerlings of grass carp, Ctenopharyngodon idella. Anim. and Plant Sci, 21(2), pp. 176-181. Comments: Fishes living in water bodies receiving industrial effluents and city waste water containing various toxicants particularly heavy metal ions, even at low concentration, absorb and accumulate these heavy metals in their various tissues like skin (including mucus), gills and intestine directly from water as well as along with the food during feeding. |
Known human health impact? | Known Comments: Harmless. |
Known economic impact? | Known References: Xing‐Guo, L., Hong‐ye, S., Zhao‐jun, G., Guofeng, C., Jie, W., Hao, Z. 2023. The environmental impact and development direction of grass carp, Ctenopharyngodon idella, aquaculture. Journal of the World Aquaculture Society, 54(5), pp. 1354-1366. Comments: Grass carp is the most important freshwater aquaculture species in China, in 2021, the yield was 5.76 million tons accounting for 18.08% of China's total freshwater aquaculture production. |
Known measurable environmental impact? | Known References: Rasmussen, J. L. 2002. The Cal-Sag and Chicago Sanitary and Ship Canal: a perspective on the spread and control of selected aquatic nuisance fish species. US Fish and Wildlife Service, Region, 3. Comments: Negative impacts on native organisms include: interspecific competition for food with invertebrates (i.e. crayfish) and other fishes; significant changes in the composition of macrophyte. |
Included in the Target Species list? | No References: HELCOM, 2009. Alien Species and Ballast Water [PDF]. Available at: (https://archive.iwlearn.net/helcom.fi/stc/files/shipping/Table_2_Alienspecies_%20lists_2009.pdf) |
Association with vessel vectors (?) | Unknown Comments: The species was first imported into the U.S. for research in the control of aquatic vegetation. |
Last update by | Sandra Gečaitė, 2024-07-11 |