Black-stripe Minnow

Growing to barely 3 centimetres in length, this diminutive freshwater fish is one of the smallest members of the galaxiid family. It displays the dark lateral banding that gives the genus its common naming conventions, with a slender, elongated body typical of galaxiids. It lacks scales, a shared trait among galaxiids, and instead has smooth skin.

Little is documented about its specific behaviour, but like related species it likely feeds on small invertebrates and zooplankton within still or slow-moving water, contributing to freshwater food webs as both predator of tiny invertebrates and prey for larger fish and aquatic birds.

The species is restricted to southwestern Australia, where it inhabits freshwater wetlands, swamps, and slow-flowing streams, often in acidic, tannin-stained waters associated with coastal plain ecosystems.

Its restricted range makes it especially vulnerable to habitat loss and degradation. Urban and housing development, along with mining and quarrying activity, have fragmented and destroyed wetland habitat. Road construction, altered fire regimes, and water management practices such as drainage and groundwater extraction have further modified hydrology critical to its survival.

Agricultural expansion into wetland areas, invasive fish species, and competition or predation from native species add additional pressure, compounding the effects of climate-driven habitat shifts.

Conservation attention has focused on wetland protection within parts of its range, along with monitoring of remaining populations and research into habitat requirements. Some populations occur within protected reserves, offering partial refuge from development pressures.

With ongoing habitat modification and a naturally limited distribution, the species remains classified as Endangered, and its population is assessed as decreasing, with no clear indication of stabilisation.