- Water degradation
- Presence of non-native fish species
June Sucker, named for its peak spawning period, only lives in Utah Lake in USA. This grey-brownish fish species, which can reach almost 60 cm in length and more than 2 kg in weight, has a lifespan of over 40 years. It has a sympatric relationship with the benthic Utah Sucker fish species.
Introduction of foreign fish species such as the Common Carp and The Yellow Pike puts the June Sucker in competition for food resources or being targeted as prey. Water pollution, loss of native vegetation, altered water flows, and drought all contributed to its rapid population decline. Its genetic makeup is also highly diluted due to breeding with the Utah Sucker fish species.