fin

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fin

(fĭn)
n.
A membranous appendage extending from the body of a fish or other aquatic animal, used for propelling, steering, or balancing the body in the water.

fin

a flattened limb found in aquatic animals, and used for locomotion.

fin

winglike structure attached to the body of fish and cetaceans; used for steering and propulsion during progress through the water.

fin rot
a disease of aquarium fish characterized by thickening followed by necrosis of the fin and tail tissues, commencing at the edges, caused by Haemophilus piscum and Aeromonas spp. May be bracketed with fin rot/tail rot/snout erosion. Often associated with suboptimal cultural conditions. Mixed populations of opportunistic bacteria are usually present.
References in periodicals archive ?
Since 2002, WWF has worked with the Ministry of Agriculture (MOA), the IHB and other partners to conserve the finless porpoise.
WWF has been working with the government and partners for years to protect and enlarge finless porpoise habitats along the Yangtze, and we welcome the creation of this new population.
With the species swiftly disappearing, the MOA launched a new conservation plan for the finless porpoise last October, which included translocation as a critical component.
Yu Kangzhen, MOA vice minister said: "Translocating some finless porpoises to a new home will help give the species a chance to survive and thrive.
Over the next 20 years, while finless porpoise numbers plummeted in the main river, the population in the Tian-e-zhou oxbow slowly increased to 45, with up to six babies now born each year.
Lei Gang, WWF Yangtze programme senior director said: "The survival of this new population of Yangtze finless porpoises depends on the support and involvement of the local communities.
This week's translocation is the first step in along process, with hopes that the oxbow could eventually be home to 100 Yangtze finless porpoises.
Chinese scientists and local fishermen during a translocation exercise finless porpoises in the Yangtze River, China
It is feared the finless porpoise could soon share the fate of the baiji in view of its rapidly declining population of around 1,000 individuals.
If the situation cannot be improved, the white-flag dolphin may be extinct within 10 years, and the black finless porpoise will also be endangered,'' Wang was quoted as saying.
In addition to deck observers equipped with high-performance optical instruments to spot dolphins, the dolphin search used hydrophone technology operated by Chinese and Japanese experts to detect acoustic signals from the baiji and finless porpoise up to a distance of 400 meters.