Mosquitofish

Source: Wikipedia, the free encyclopedia.
Not to be confused with eastern mosquitofish or Heterandria formosa.

Mosquitofish
Female
Male

Least Concern  (IUCN 3.1)[1]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Cyprinodontiformes
Family: Poeciliidae
Genus: Gambusia
Species:
G. affinis
Binomial name
Gambusia affinis
Synonyms[2]
  • Heterandria affinis S.F Baird & Girard, 1853
  • Heterandria patruelis S.F. Baird & Girard, 1853
  • Gambusia patruelis (S.F. Baird & Girard, 1853)
  • Zygonectes patruelis (S.F. Baird & Girard, 1853)
  • Gambusia gracilis Girard, 1859
  • Zygonectes gracilis (Girard, 1859)
  • Gambusia humilis Günther, 1866
  • Haplochilus melanops Cope, 1870
  • Zygonectes brachypterus Cope, 1880
  • Zygonectes inurus D.S. Jordan & Gilbert, 1882
  • Fundulus inurus (D.S. Jordan & Gilbert, 1882)

The western mosquitofish (Gambusia affinis) is a North American freshwater

Gambusia holbrooki
) is also referred to by these names.

Mosquitofish are small in comparison to many other

gravid spot at the posterior of her abdomen. The name "mosquitofish" was given because the fish eats mosquito larvae, and has been used more than any other fishes for the biological control of mosquitoes.[3] Gambusia typically eat zooplankton, beetles, mayflies, caddisflies, mites, and other invertebrates; mosquito larvae make up only a small portion of their diet.[4]

Mosquitofish were introduced directly into ecosystems in many parts of the world as a

Chennai Corporation in India introduced western mosquitofish in 660 ponds to control the mosquito population in freshwater bodies.[10]

Fertilization is internal; the male secretes

gonopodium.[3][11] Within 16 to 28 days after mating, the female gives birth to about 60 young.[3][12] The males reach sexual maturity within 43 to 62 days. The females, if born early in the reproductive season, reach sexual maturity within 21 to 28 days; females born later in the season reach sexual maturity the next season, in six to seven months.[13]

Description

Mosquitofish are small and of a dull grey coloring, with a large abdomen, and have rounded dorsal and caudal fins and an upturned mouth.

Xiphophorus maculatus; they are commonly misidentified as mosquitofish.[3][14]

Naming and taxonomy

The mosquitofish is a member of the family Poeciliidae of order Cyprinodontiformes. The genus name Gambusia is derived from the Cuban Spanish term gambusino, meaning "useless".[15] The common name, mosquitofish, is derived from their use for biological control of mosquitoes, which itself was based on early observations that, in certain circumstances, they can reduce mosquito abundances. Classification of the western mosquitofish has been difficult due to their similarity to the eastern mosquitofish, and according to ITIS (Integrated Taxonomic Information System), G. holbrooki (eastern mosquitofish) may be an invalid taxonomic name, and could be considered a subspecies of G. affinis.[3][16]

Diet

Mosquito larvae

Mosquitofish are diet generalists, but they are considered "larvivorous" because they consume the larvae of mosquitoes and other aquatic insects.[17] Their diet consists of zooplankton, small insects and insect larvae, and detritus material. Mosquitofish feed on mosquito larvae at all stages of life, if mosquito larvae are available in the environment. Adult females can consume up to hundreds of mosquito larvae in one day.[3] Maximum consumption rate in a day by one mosquitofish has been observed to be from 42%–167% of its own body weight.[18] However, they can suffer mortality if fed only mosquito larvae, and survivors of this diet shows poor growth and maturation.[19] As generalists, mosquitofish have also shown cannibalistic behavior on the young of their own species.[20]

Habitat

The native range of the mosquitofish is from southern parts of Illinois and Indiana, throughout the Mississippi River and its tributary waters, to as far south as the Gulf Coast in the northeastern parts of Mexico.[21] They are found most abundantly in shallow water protected from larger fish.[11] Mosquitofish can survive relatively inhospitable environments, and are resilient to low oxygen concentrations, high salt concentrations (up to twice that of sea water), and temperatures up to 42 °C (108 °F) for short periods.[14] Because of their notable adaptability to harsh conditions and their global introduction into many habitats for mosquito control, they have been described as the most widespread freshwater fish in the world.[22] Some of their natural predators include the bass, catfish and bluegill.[23]

Global invasion history and environmental impact

Monument constructed in Sochi honouring the western mosquito fish for eradicating malaria in the region

Mosquitofish were intentionally introduced in many areas with large mosquito populations to decrease the population of mosquitoes by eating the mosquito larvae.[3] However, retrospectively, many introductions could be considered ill-advised; in most cases native fishes supplied control of mosquito populations, and introducing mosquitofish has been harmful to indigenous aquatic life.[22] Mosquitofish introduction outside of their native range can also be harmful to ecosystems.[24][25] Mosquitofish can consume or injure other small fish or otherwise harm them through competition.[18] The ecological impacts of mosquitofish are partly dictated by their sex ratio, which can vary dramatically across their introduced range.[26] Mosquitofish in Australia are considered noxious pests where they pose a threat to native fish and frog populations and little evidence indicates they have controlled mosquito populations or mosquito-borne diseases. They have been dubbed by scientists as "one of the most problematic animals on the planet".[27]

However, from the 1920s to the 1950s, mosquitofish were considered by some to be a significant factor in eradicating malaria in South America, southern Russia, and Ukraine. Mosquitofish bred by Joice Loch were distributed through Greece, Serbia and the Middle east.[28] On the coast of the Black Sea in Russia, the mosquitofish is commemorated for eradicating malaria by a monument in Sochi.[29]

Mosquitofish are still employed for biological control of mosquitoes in some places. In 2008, in some parts of California and in Clark County, Nevada, mosquitofish were bred in aquariums so people could stock stagnant pools of water with the mosquitofish to reduce the number of West Nile virus cases.[30]

Through species distribution models, it has been revealed that G. affinis exhibit significant niche expansions beyond their natural climatic ranges, with a notable shift towards tropical regions in Asia.[5] These findings highlight the ecological flexibility of these species, contributing to their extensive success and posing a substantial risk for further range expansion. Furthermore, it is assumed that the species will continue to spread in the course of climate change.[5]

Reproduction

Reproduction of the mosquitofish starts with the male arranging the

photoperiod is less than 12.5 hours long, the next clutch of oocytes develops.[31] In one reproductive season, a female may fertilize, with stored milt, two to six broods of embryos, with the size of the brood decreasing as the season progresses.[13] Reproduction rates are highly dependent on temperature and ration level. As temperature increases from 20 to 30 °C, mean age at first reproduction decreases from 191 to 56 days, and brood size and mass of offspring increase significantly. Interbrood interval estimates at 25 and 30 °C are 23 and 19 days, respectively.[33]

Embryology

Mosquitofish have a 16- to 28-day

viviparous, which means after the gestation of a brood, the female will have live birth.[2][31] In most cases, the newborn brood will have an equal male to female sex ratio.[13]

Growth

After birth, newborn mosquitofish are about 8 to 9 mm (0.31 to 0.35 in) in length. As juveniles, they grow at a rate of about 0.2 mm (0.0079 in) per day, but growth is highly temperature-dependent. Growth rates of juvenile mosquitofish reach their peak when the water temperature is within a range of 24 to 30 °C (75 to 86 °F), depending on resource availability.[35] As temperatures rise above or dip below this range, growth rates decrease. Consistent temperatures at or above 35 °C (95 °F) are typically lethal, while growth stops when temperatures are at or below 10 °C (50 °F).[13] For male mosquitofish, sexual maturity is reached in about 43 to 62 days, but maturation age is also dependent on temperature and resources.[36] Female mosquitofish reach sexual maturity in about 21 to 28 days if born early within the reproductive season. The lifespan of a mosquitofish averages less than a year and the maximum is about 1.5 years. However, mosquitofish kept as pets can live much longer, with owners reporting lifespans of over three years. Male mosquitofish lifespans are considerably shorter than females.[13]

References

  1. doi:10.2305/IUCN.UK.2019-2.RLTS.T166562A58317114.en
    . Retrieved 19 November 2021.
  2. ^ a b c Froese, Rainer; Pauly, Daniel (eds.) (2019). "Gambusia affinis" in FishBase. August 2019 version.
  3. ^ a b c d e f g h i j k Masterson, J. "Gambusia affinis". Smithsonian Institution. Retrieved 21 October 2011.
  4. ^ Lund, Mark (16 November 2005). Mosquitofish: Friend or Foe? Edith Cowan University.
  5. ^
    PMC 8717293
    .
  6. S2CID 239088797
    .
  7. ^ Alameda County Mosquito Abatement Program http://www.mosquitoes.org
  8. ^ Mosquitofish Archived 9 June 2012 at the Wayback Machine. Santa Clara County Vector Control District
  9. ^ Contra Costa County Mosquito and Vector Control District http://www.contracostamosquito.com/
  10. ^ "Mosquitofish introduced in ponds to tackle mosquito menace". Business Standard India. Press Trust of India. 23 February 2014 – via Business Standard.
  11. ^ a b c d Kuntz, Albert (1913). "Notes on the Habits, Morphology of the Reproductive Organs, and Embryology of the Viviparous Fish Gambusia affinis". Bulletin of the United States Bureau of Fisheries. 33. Department of Commerce: 181–190.
  12. ^ a b c Rajkumar, R (1987). "Trophic microvilli of the belated embryos of Gambusia affinis (Baird and Girard) (Atheriniformes: Poeciliidae)". Journal of the Inland Fisheries Society of India Barrackpore. 19 (1): 32–36.
  13. ^ a b c d e f Whiteside, Bobby; Bonner, Timothy; Thomas, Chad; Whiteside, Carolyn. "Gambusia affinis western mosquitofish". Texas State University. Archived from the original on 25 April 2012. Retrieved 25 October 2011.
  14. ^ a b "Gambusia affinis (fish)". Global Invasive Species Database. Retrieved 21 October 2011.
  15. ^ Wallus & Simon 1990, p. 175
  16. ^ "Gambusia holbrooki Girard, 1859". ITIS. Retrieved 30 December 2011.
  17. ^ Regional Office for the Eastern Mediterranean (2003). Use of Fish For Mosquito Control (PDF). World Health Organization. p. 15. Retrieved 2 January 2012.
  18. ^ a b Nico, Leo; Fuller, Pam; Jacobs, Greg; Cannister, Matt (19 August 2009). "Gambusia affinis". USGS. Retrieved 25 October 2011.
  19. ^ Kitching, R.l., ed. The Ecology of Exotic Animals. Milton: John Wiley and Sons, 1986. 7-25.
  20. S2CID 84921196
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  21. JSTOR 1438757
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  22. ^ a b "Гамбузия". Great Soviet Encyclopedia (in Russian). Moscow.
  23. ^ "Archived copy" (PDF). Archived from the original (PDF) on 31 October 2020. Retrieved 28 October 2020.{{cite web}}: CS1 maint: archived copy as title (link)
  24. ^ "Aquatic Invasive Species: Gambusia affinis (Mosquito fish)". Washington Department of Fish and Wildlife. Washington Department of Fish and Wildlife. Retrieved 2 January 2012.
  25. ^ Rupp, Henry (1995). "Adverse Assessments of Gambusia affinis". North American Native Fishes Association (NANFA). Retrieved 2 January 2012.
  26. PMID 26490793
    .
  27. ^ "Robot fish scare off invasive species in Australian waters, study finds". ABC News. Australian Broadcasting Corporation. 17 December 2021. Retrieved 17 December 2021.
  28. ISBN 0-86806-691-5
  29. ^ Vinogradova 2000, p. 187
  30. ^ Russel, Sabin (12 July 2008). "Heat wave adds to West Nile danger". San Francisco Chronicle. San Francisco, California: SFGate. p. B–1. Retrieved 3 January 2012.
  31. ^
    PMID 10617862
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  32. doi:10.1002/jez.1402660506
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  33. doi:10.1111/j.1095-8649.1988.tb05463.x
    .
  34. S2CID 37006846
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  35. doi:10.1577/1548-8659(1983)112<653:GAAOJM>2.0.CO;2
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  36. doi:10.1111/j.1095-8649.1988.tb05463.x
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Bibliography

External links
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