Hyttysten luonnollinen vihollinen

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Viestejä45973
Liittynyt3.9.2015

Moskiittokalasta, jota istutetaan malaria-alueilla, on näköjään jalostettu kylmää kestävä lajike.
http://www.fattigfish.com/mosfish.htm
Katso myös:
http://en.wikipedia.org/wiki/Mosquitofish

Kommentit (1)

Vierailija

Sehän vielä puuttuikin - miksipä istuttaa hankalaa tulokaslajia vain lämpimille seuduille, kun sitä voi lavein mainoslausein kaupata muuallekin paikallisen luonnon riesaksi?

Wikipediasta:

This species may now be the most widespread freshwater fish in the world, having been introduced as a biocontrol to tropical and temperate countries in both hemispheres, and then spreading further both naturally and through even further introductions. The majority of these introductions were foolish; in most countries where mosquitofish have been introduced it has been proved that the endemic fish species were already providing maximal mosquito control, and that the introduction of mosquitofish has been both unnecessary and highly damaging to endemic fish and other endemic aquatic life.



Lisäksi laji ei ole edes tehokas hyttysentoukkien hävittäjä:
Mosquitofish were introduced by military and local councils to control mosquito populations, however there has been no evidence that gambusia has had any effect in controlling mosquito populations or mosquito borne diseases. In fact, studies have shown that gambusia can suffer mortalities if fed only on mosquito larvae, and survivors show poor growth and maturation. Gambusia typically eat zooplankton, beetles, mayflies, caddies flies, mites and other invertebrates; mosquito larvae make up only a small portion of their diet



Kalan istutus voi itse asiassa kasvattaa hyttyspopulaatioita, ja lisäksi kyseessä on uskomattoman häijy pieni kala, joka syrjäyttää itseään suurempiakin lajeja. Juuri tästä syystä sitä harvemmin pidetään akvaariokalana.
Unfortunately, gambusia may have exacerbated the mosquito problem in many areas by outcompeting native invertebrate predators of mosquito larvae. Because of their aggressive nature and high birthrate, mosquitofish can overtake most native species in an area, drastically harming local populations.



Näyttää siltä, että moskiittokala (Gambusia affinis) todella on nimensä veroinen (gambusino = hyödytön).

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