一般影響
Burr 等人(1996)報告指出，白鰱(Hypophthalmichthys molitrix)和大頭鰱(Hypophthalmichthys nobilis)的潛在影響，尚未被充分認識。顯然這些魚的銷售市場還沒有建立。很難正確地鑑定這些魚，使得商業性地捕撈這些物種的合法性難以確定，讓一些漁民深感苦惱。海灣州際海洋漁業委員會(2003)報告指出，白鰱(Hypophthalmichthys molitrix)會消耗大量的浮游植物。儘管如此，引入這個物種潛在的影響，是難以估量。如果繁殖形成穩定的族群，個體數量增加後，可以預期會使食物網結構產生變化。據報導，雖然大部分吃浮游植物，並配備了高度特化的濾食器官，白鰱會吃環境中任何形式的浮游生物。當缺乏浮游植物時，此物種會吃浮游動物(Spataru和Gophen, 1985; Burke 等人, 1986)。Spataru and Gophen(1985)報告指出，放養白鰱會使浮游動物生物量下降。
海灣州際海洋漁業委員會(2003)報告指出，白鰱(Hypophthalmichthys molitrix)可以傳播疾病到新的區域。Bocek 等人(1992)發現這個物種是一種鼠傷寒沙門氏菌有效的載體。
地點特有的影響：Lake Donghu (China) 
降低本地生物多樣性: In Asia, one of the worst DOCumented negative effects on fish biodiversity has resulted from within country translocations, for example in Donghu Lake, Wuhan, China when the introduction of grass carp resulted in the decimation of submerged macrophytes and the consequent ecological changes brought about an upsurge of Hypophthalmichthys spp. (Aristichthys nobilis) and silver carps (Hypophthalmichthys molitrix) and also the disappearance of most of the 60 fish species native to the lake (Chen, 1989) (Nguyen and Nakorn, 2004). Govind Sagar Reservoir (India)
降低本地生物多樣性: The silver carp, H. molitrix was introduced to India in 1959. It was accidentally introduced into the Govind Sagar reservoir where it drastically reduced the populations of the native Catla catla and Tor putitora (Sethi et al UNDATED). Nepal
降低本地生物多樣性: Exotic fish such as carp have been migrated into river systems and reservoirs of Nepal since their introduction in the rice paddies fish culture system. It is feared that in long run exotic may replace indigenous species such as golden mahseer, deep-bodied mahseer and many other endemic species (Shrestha, UNDATED).
|
