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The African turquoise killifish lives in ephemeral ponds in Zimbabwe and Mozambique.

A team of researchers from Cologne, Germany, has now investigated the age-related fasting effects in killifish.

Such a case unfolded recently for the ichthyologist Wilson Costa of the Federal University of Rio de Janeiro, who has long studied the diversity of killifish inhabiting southeastern Brazil's Atlantic Forest.

California killifish infected with a trematode flatworm, for example, are 10 times to 30 times more likely to become meals for birds than uninfected fish.

So the parasite creates cysts on its host’s brain, causing the hapless killifish to splash around on the surface of the water and flash its shiny belly, baiting the birds.