What does this research mean for the field?

Extreme water temperatures (13°C and 35°C) arrest the development and maturation of the nematode Pseudocapillaria tomentosa in zebrafish, a process that reversibly resumes when temperatures return to optimal levels (28°C). Novelty: ClaimNovelty.CONFIRMATORY. Consensus alignment: ConsensusAlignment.SUPPORTS_CONSENSUS.

What question did this study set out to answer?

To determine how water temperature across the tolerable thermal range (13°C–35°C) regulates Pseudocapillaria tomentosa egg larvation, infectivity, and adult worm maturation in zebrafish.

September 2, 2026Journal of Fish Diseases

Temperature Influences Pseudocapillaria tomentosa Infections in Zebrafish, Danio rerio (Hamilton 1822)

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Authors

CLConnor LeongOregon State University RSRuby ScanlonOregon State University CSCorbin J. SchusterOregon State University

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Implication

Experimental study reveals thermal extremes arrest nematode maturation in zebrafish hosts, indicating seasonal temperature swings drive parasitic infection dynamics.

Key Points

To determine how water temperature across the tolerable thermal range (13°C–35°C) regulates Pseudocapillaria tomentosa egg larvation, infectivity, and adult worm maturation in zebrafish.
Assessed P. tomentosa egg larvation and viability following incubation at 4°C, 13°C, 28°C, and 35°C, including reactivation upon return to 28°C.
Exposed larval and adult zebrafish (Danio rerio) to parasites across a thermal range of 13°C to 35°C, monitoring worm burden, larval arrest, and maturation timeframes up to 102 days post-exposure.
Eggs held at 4°C or 13°C failed to larvate but resumed development when transferred to 28°C, whereas 35°C promoted larvation but reduced parasite infectivity in larval fish.
Cold water (13°C) arrested adult zebrafish worm development for up to 102 days post-exposure with only immature larvae present, followed by rapid maturation into gravid females within one month after return to 28°C.
Fish maintained at 35°C exhibited lower worm burdens and arrested maturation compared to 28°C controls, with worm development restarting after temperatures were lowered.

Cite This Study

Leong et al. (2026) studied this question.

synapsesocial.com/papers/6a97e2c5c562ede874ec70ec https://doi.org/10.1111/jfd.70268

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Implication

Experimental study reveals thermal extremes arrest nematode maturation in zebrafish hosts, indicating seasonal temperature swings drive parasitic infection dynamics.

Temperature Influences Pseudocapillaria tomentosa Infections in Zebrafish, Danio rerio (Hamilton 1822)

Discussion

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Implication

Key Points

Cite This Study

Temperature Influences Pseudocapillaria tomentosa Infections in Zebrafish, Danio rerio (Hamilton 1822)

Discussion

Member takes

Implication

Key Points

Cite This Study

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