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When it comes to fish families, the bigger and bossier the better

Date:
December 21, 2009
Source:
McMaster University
Summary:
When given the choice between unfamiliar social groups, cichlid fish chose groups where the members are large and dominant.
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A research team from McMaster University and the University of New South Wales has found that among cichlids, a species that lives in groups, members make strategic decisions about their living situation.
Credit: Image courtesy of McMaster University

If you are spending the holidays with big Uncle Frank or bossy Aunt Minnie and wondering whether you would be better off with another family, spare a thought for the humble cichlid fish.

A research team from McMaster University and the University of New South Wales has found that among cichlids, a species that lives in groups, members make strategic decisions about their living situation.

The results appear in the current issue of Biology Letters.

The helper class of cichlids showed a preference for joining groups of familiar individuals, some likely to be family members. But when given the choice between unfamiliar social groups the helpers chose groups where the members were bigger and bossier.

At the beginning of the experiment, which was conducted in Zambia's Lake Tanganyika, researchers expected that individual cichlids would base their group-living arrangements on whether they could improve their social rank and thereby expedite their attainment of breeding status.

However, when faced with a choice between unfamiliar groups they chose the group that did not enhance their rank but that contained larger group members.

"It seems that cichlids potentially prefer groups of dominant members for reasons of survival due to the increased protection from predation when larger group members are around," says Marian Wong, a post-doctoral fellow in McMaster's Department of Psychology, Neuroscience & Behaviour, and co-author of the study.

In other words, fish -- like humans -- understand that membership has its rewards.

The study was funded by the Natural Sciences and Engineering Research Council, the Canadian Commonwealth Post-Doctoral Fellowship, and the Ontario Ministry of Research and Innovation Post Doctoral Fellowship.


Story Source:

The above story is based on materials provided by McMaster University. Note: Materials may be edited for content and length.


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McMaster University. "When it comes to fish families, the bigger and bossier the better." ScienceDaily. ScienceDaily, 21 December 2009. <www.sciencedaily.com/releases/2009/12/091214121438.htm>.
McMaster University. (2009, December 21). When it comes to fish families, the bigger and bossier the better. ScienceDaily. Retrieved May 27, 2015 from www.sciencedaily.com/releases/2009/12/091214121438.htm
McMaster University. "When it comes to fish families, the bigger and bossier the better." ScienceDaily. www.sciencedaily.com/releases/2009/12/091214121438.htm (accessed May 27, 2015).

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