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Highlighting the species diversity, pricing trends, and conservation concerns in a major ornamental fish hub

Ho, S. C. L.; Chan, J. C.; Lee, W. H.; Sung, Y. H.; Liew, J. H.

2025-02-27 zoology
10.1101/2025.02.20.639396 bioRxiv
Show abstract

The global ornamental fish trade presents significant challenges to conservation of biodiversity. Here we explore patterns in the freshwater ornamental fish market in Hong Kong, a major wildlife trading hub. Weekly surveys over three-months in the primary aquarium district documented 540 freshwater fish species from 73 families. We found that species occurrence in the market was largely price-driven, and minimum retail price was the strongest predictor of their frequency of occurrence. Along the occurrence-price gradient, we found that potentially undescribed species dominated the rare/expensive end of the market, potentially influenced by the anthropogenic allee effect. Alarmingly, 86 species (16%) were potentially undescribed, while 38% were either not evaluated or classified as Data Deficient by the IUCN. While common/cheaper species dominate the market, the substantial number of little-known species being sold is of conservation concern, underscoring the need for more extensive monitoring at the risk of losing them to unregulated exploitation.

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