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Influence of Behavior on Size in Mangrove Killifish

Investigating if behavior affects the size of hemaphroditic mangrove killifish (Kryptolebias marmoratus), exploring bravery levels and foraging habits.

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Influence of Behavior on Size in Mangrove Killifish

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  1. Krish Lewis Dept. of Biodiversity & Conservation Biology University of the Western Cape P. Bag X17, Bellville 7535, RSA SKUZZY@live.com Mangrove killifish (Kryptolebiasmarmoratus): does behavior influence size?

  2. Mangrove killifish (Kryptolebiasmarmoratus): does behavior influence size? • Description • Hemaphrodite: • Individuals which have both • Sex organs present • The mangrove killifish (Kryptolebias marmoratus) is the only vertebrate animal able to undergo internal self fertilization and have viable offspring (Rhee et al 2010). • (www.milvertz.dk) What are they? Mangrove Killifish (Kryptolebias Marmoratus): does behaviour influence size? 23/02/2011 Krish Lewis

  3. Mangrove killifish (Kryptolebiasmarmoratus): does behavior influence size? • Suitability to the study • The Fish to be used • Although they are the same age they are different sizes • Also have different levels of “Bravery” or “Adventurism” Objective Mangrove Killifish (Kryptolebias Marmoratus): does behaviour influence size? 23/02/2011 Krish Lewis

  4. Mangrove killifish (Kryptolebiasmarmoratus): does behavior influence size? Research question: Shyer fish forage food less readily, thus have slower growth rate Hypothesis: The larger the fish the more willing it would be to move into open water in order to feed. Key Observations Mangrove Killifish (Kryptolebias Marmoratus): does behaviour influence size? 23/02/2011 Krish Lewis

  5. Mangrove killifish (Kryptolebiasmarmoratus): does behavior influence size? Material and Methods Mangrove Killifish (Kryptolebias Marmoratus): does behaviour influence size? 23/02/2011 Krish Lewis

  6. Mangrove killifish (Kryptolebiasmarmoratus): does behavior influence size? I Acknowledge Dr. Knight for his assistance and feed back with this project. Acknowledgements Mangrove Killifish (Kryptolebias Marmoratus): does behaviour influence size? 23/02/2011 Krish Lewis

  7. References • K. Cole & D.L.G. Noakes. 1997. Gonadal development and Sexual Allocation in Mangrove Killifish, Rivulus Marmoratus (Pisces: Antherinomorpha). Copeia. 3: 596 – 600 • K. Hill. 2001. Rivulus Marmoratus. Smithsonian Marine Station. [internet].{cited: 11/02/11} available from: http://www.sms.si.edu/IRLSpec/Rivulu_marmor.htm • http://www.milvertz.dk/marmoratus.html (Killifish image) • Rhee J, Kim R, Seo JS, Kang HS, Park C, Soyano K, Lee J, Lee Y, Lee J. 2010. Comparative Biochemistry and Physiolog, Part C. 152: 456-466 Mangrove Killifish (Kryptolebias Marmoratus): does behaviour influence size? 23/02/2011 Krish Lewis

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