Female fish abandoned by males to raise offspring on their own

September 20, 2010

Caring for children can be a tough job, particularly if you are a female cichlid fish.

Native to the crater lakes of Nicaragua, look after their young by defending them against would-be predators. While male and female cichlid generally share parental responsibilities, research shows that this is not always the case.

Conducted by an international team of researchers that included two biologists from Monash University, and published in the journal Behavioral Ecology and Sociobiology, new research has shown that male cichlid fish have a propensity to desert their mates, leaving them to then look after the young as single parents.

In an attempt to understand the ecological factors underlying this behaviour, lead author, Dr Topi Lehtonen from the University of Turku in Finland, spent many hours underwater observing the parental behaviours of different cichlid fishes.

Dr Lehtonen and his colleagues, including Dr Bob Wong and Dr Andreas Svensson from Monash University and Professor Axel Myer from Konstanz University in Germany, found that mate desertion was more common among the larger cichlid species inhabiting the lakes and desertion was also more likely to take place later in the breeding season.

Dr Bob Wong, a Senior Lecturer in the Science Faculty at Monash University said the exact reasons why the male cichlid fish would abandon their mates and their offspring are not entirely clear, but the motivation is likely linked to the costs and benefits of extended care and the availability of additional mating opportunities.

"Regardless of motives, being deserted by their mate is bad news for the abandoned female cichlid fish and her young brood," Dr Wong said.

The research found that male desertion severely compromised the quality of care that females were able to provide to their young, particularly in defending their babies against formidable fish predators, such as the bigmouth sleeper fish.

"The findings provide important insights into animal mating systems, the evolution of parental care and the costs and benefits of caring for offspring," Dr Wong said.

Explore further: Choosy females make colourful males

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not rated yet Sep 21, 2010
The late in the season desertions could also be due to a drop in the mating and brooding hormones due to fewer and fewer fish being in the mood so to speak.
Perhaps there is a "threshold" created by X number of breeding pairs. Once the # breeding pairs drops below the # needed to keep the concentration sex/breeding/brooding hormone at or above that threshold the desire to stay together among males still coupled starts to fade, and they start to leave. Rather than an individual behavior, it could be due to an effect created by the group on their environment.

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