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Lower chronic temperature limits in three common tropical aquarium fish.

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Názov: Lower chronic temperature limits in three common tropical aquarium fish.
Autori: Leggatt, R.A.1 (AUTHOR), Graham, Y.1 (AUTHOR), Laqua, E.1 (AUTHOR), Biagi, C.A.1 (AUTHOR), Devlin, R.H.1 (AUTHOR), Wellband, K.W.1 (AUTHOR) Kyle.wellband@dfo-mpo.gc.ca
Zdroj: Canadian Journal of Zoology. 10/27/2025, Vol. 103, p1-7. 7p.
Predmety: *THERMAL tolerance (Physiology), *AQUARIUM fishes, *ENVIRONMENTAL risk assessment, *BODIES of water, *FRESHWATER fishes, *COMPETITION (Biology)
Geografický termín: CANADA
Abstrakt: Assessing the ability of tropical fish to survive winter temperatures typical of Canadian waterbodies is an important component of environmental risk assessments conducted for genetically engineered tropical aquarium fish introduced to Canada. We determined the lower temperature tolerance limits of three species: Betta splendens Regan, 1910, Pristella maxillaris (Ulrey, 1894), and Corydoras aeneus (Gill, 1858) currently available in genetically engineered strains, using modified chronic lethal minimum temperature trials. When temperature was lowered daily by 1 °C from a starting temperature of 20.5 °C, all species lost equilibrium at several degrees warmer than typical winter water temperatures in Canada (10.0 ± 1.2 °C Bettas, 12.7 ± 1.1 °C Corydoras, and 13.2 ± 0.5 °C Pristellas, typical winter water temperatures are 4 °C or less). Consequently any introduced individuals in the three species are not expected to overwinter, and hence do not have the ability to establish, in Canadian freshwater systems. Activity and feeding level decreased at 17.5–16.5 °C (Bettas), 16.5–15.5 °C (Pristellas), and 14.5–13.5 °C (Corydoras). As temperatures are expected to be below this in all but the summer months in most systems, introduced individuals would be expected to be limited spatially and temporally where they would be active enough to interact competitively or aggressively (Bettas only) with native species sharing similar niches. [ABSTRACT FROM AUTHOR]
Databáza: Academic Search Index
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Abstrakt:Assessing the ability of tropical fish to survive winter temperatures typical of Canadian waterbodies is an important component of environmental risk assessments conducted for genetically engineered tropical aquarium fish introduced to Canada. We determined the lower temperature tolerance limits of three species: Betta splendens Regan, 1910, Pristella maxillaris (Ulrey, 1894), and Corydoras aeneus (Gill, 1858) currently available in genetically engineered strains, using modified chronic lethal minimum temperature trials. When temperature was lowered daily by 1 °C from a starting temperature of 20.5 °C, all species lost equilibrium at several degrees warmer than typical winter water temperatures in Canada (10.0 ± 1.2 °C Bettas, 12.7 ± 1.1 °C Corydoras, and 13.2 ± 0.5 °C Pristellas, typical winter water temperatures are 4 °C or less). Consequently any introduced individuals in the three species are not expected to overwinter, and hence do not have the ability to establish, in Canadian freshwater systems. Activity and feeding level decreased at 17.5–16.5 °C (Bettas), 16.5–15.5 °C (Pristellas), and 14.5–13.5 °C (Corydoras). As temperatures are expected to be below this in all but the summer months in most systems, introduced individuals would be expected to be limited spatially and temporally where they would be active enough to interact competitively or aggressively (Bettas only) with native species sharing similar niches. [ABSTRACT FROM AUTHOR]
ISSN:00084301
DOI:10.1139/cjz-2025-0030