Early reproductive success predicts lifespan in male killifish
A laboratory experiment used sperm collected from male fish at three ages to assess reproduction, finding no trade-off between early reproductive success and lifespan.
Our read
Mechanisms- Studied:
- Experiments in 48 male turquoise killifish, throughout life
- What changed:
- Male killifish with higher early-life embryo survival lived longer
- The catch:
- Reproductive success was represented by embryo survival 72 hours after fertilization
Editor of record: Boris Djordjevic · AgingResearch.News
Male turquoise killifish from the laboratory-reared GRZ-D strain were studied in an experiment examining reproduction and lifespan. Researchers collected sperm at average ages of 62.8, 103.5 and 140 days and used it to fertilize eggs outside the body. They counted fertilized eggs and measured embryo survival 72 hours after fertilization.
Greater early-life reproductive success predicted longer male lifespan, rather than shorter life. The authors attributed this pattern to “intrinsic quality”: underlying differences among individuals that influence both survival and reproduction. A model built around that proposed shared influence reproduced the observed patterns. The males’ median lifespan was 154 days.
Why it matters
Differences in lifespan among members of the same species remain poorly understood. The work addresses whether the costs of reproduction explain those differences.
Caveats
The model assumed that intrinsic quality influenced both reproduction and survival, so matching the observations did not independently test that assumption. The experiment used laboratory-reared males from one strain.
The paper
Leibniz Institute on Aging
Philosophical Transactions of the Royal Society of London, Series B, Nov 12, 2026, Open access, CC BY
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