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Stranger In The Pond

Howard Reisman

image of mosquitofish

Trout Pond Park is a 40-acre Southampton Town Park located on Noyac Road.  Within the park there is a mile-long loop trail that meanders through an oak forest and around a 7-acre pond.  Two upland groundwater-fed streams and direct groundwater seepage are the primary sources of water for the pond.  The pond ultimately flows over a spillway into Mill Creek, Noyac Bay and the Peconic Bay Estuary.  Currently, the only trout in Trout Pond are those surviving rainbow and brown trout introduced by the Town Trustees.  However, in the late 19th century, this pond was stocked with trout in hopes of establishing a harvestable supply.  A recent preliminary study of the water quality and biological assets of Trout Pond was performed by Southampton College Prof. Robert Turner and his hydrology class.  Trout Pond lies downstream on an area that is currently under development.  Turner and his students have initiated a program to monitor any ecological impact such development would have on the pond.  Last October, a survey of fishes revealed the usual suspects: largemouth bass, pumpkin seed sunfish, American eel, carp, rainbow trout and mosquitofish.  MOSQUITOFISH?  Would you know one if you saw one? Not likely. Mosquitofish could be confused with rainwater killifish; both are small and similarly shaped except the Mosquitofish has a more strongly upturned mouth.  The Mosquitofish, Gambusia affinis, belongs to a large fish family that is better known from Central and South America.  When the mosquitofish is found so far north it is because it was introduced.  This practice started over 50 years ago for the mosquito control.  Although, Gambusia can not easily survive cold water, occasionally they can over winter in such ponds as Trout Pond.


Unlike any of our native freshwater and marine fishes, female Gambusia gives birth to live young after carrying them for 3 to 4 weeks.  The male uses an organ (the gonopodium) modified from his anal fin rays to inseminate females.  Mosquitofish are only a little more than 2 inches in length.  Like many small fishes they have a very short lifespan.  Males and females rarely live more than 1 and 3 years, respectively.  Life is tough in Trout Pond for these fish.  If they do not succeed to survive the winter, larger fish find them perfect snacks.  So, this summer when you are hiking around Trout Pond with one less mosquito bite, thank a Gambusi

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