Redfinned bully

Taxobox
name = Redfinned bully
regnum = Animalia
phylum = Chordata
classis = Actinopterygii
ordo = Perciformes
familia = Eleotridae
genus = "Gobiomorphus"
species = "G. huttoni"
binomial = "Gobiomorphus huttoni"
binomial_authority = (Ogilby, 1894)

The redfinned bully, "Gobiomorphus huttoni", is a sleeper of the genus "Gobiomorphus", found in most rivers in New Zealand including the Chatham Islands. Their length is up to 12 cm.

Adult male redfinned bullies have bright red fins, and all of the species have diagonal stripes on their cheeks.

Redfinned bullies are strictly diadromous and do not establish land-locked populations. Thus, they tend to live near the coast even though they are very good climbers; populations above 5 m waterfalls have been recorded.

The juveniles enter fresh water in the spring and reach maturity about two years later. Spawning takes place in fresh water and after hatching the larvae are swept down to the sea. This diadromous habit means that they are widespread throughout the country and have been frequently recorded from the Chatham and Stewart Islands. However, their preference for streams with large stable substrates means that they are rare along the east coast of the South Island above Oamaru, except for Banks Peninsula.

References

*
* [http://www.niwascience.co.nz/rc/freshwater/fishatlas/species/redfin_bully NIWA June 2006]