Mr. Masai is a researcher and has worked within the fresh water environment for over 15 years within lake Victoria and other small fresh water bodies within the western parts of Kenya. He has worked various fields including on the systematics distribution of the zooplankton communities and their contribution to fisheries of Lake   lakes and other small water bodies in western part of Kenya. The composition and diversity of fish species within the small water bodies. He later changed his interest to aquaculture and worked towards identifying a suitable fish species for culture in the country.

On management, Component coordinator Biodiversity subcomponent In charge of coordinating biodiversity studies under the Biodiversity component Lake Victoria Environmental Project. (LVEMP I) Senior Management and Finance  committee Inland and Fresh waters,  Kisumu Center

 Regiona chair information and communication outreach (ICO) for IFMP  regional project. Within the institute he has undertaken various responsibilities being the station coordinator in one of the aquaculture station. Currently the Liaison officer and the station coordinator Nairobi station.

• Samuel Kenyanaya Mutune Masai and Peter Miruka (2014) Baseline Survey on The Potential of Fish Production In Selected Water Bodies Within Taita Taveta County. Technical Report prepared for The Ministry of Agriculture, Livestock and Fisheries, Taita Taveta County 
• E.O. Yongo, G. Morara,J. Ojuok C. Nyamweya,W. Ojuang, M. Masai and C Wasike. ) Socio- Economic Aspects of Fisheries Management in Lake Naivasha. African Journal of Tropical Hydrobiology and Fisheries. 13: 27-32 
• Masai D. M., R. Omondi and M. Owili (2006). Systematics and distribution of zooplankton in Lake Victoria basin, Kenya pp 230- 235 in Proceedings of the 11th World Lakes Conf. 31st Oct 4th Nov 2005 
• Masai M.D., J. E. Ojuok and W. Ojuang (2005) Fish Species Composition Distribution and Abundance In Lake Victoria Bain, Kenya 325-337in Knowledge and Experiences gained from Managing The Lake Victoria Ecosystem Colour Print (T) Limitedp724 
• Charo-Karisa, H., Munguti, J., Okechi, J.K., Ouma, H., Mutune D. Masai, Jérôme Lazard, Olivier Mikolasek, Lazare Kouediekong (2009). Characterization of fish farming in Western region and its surroundings (Kenya 
• M. D. Masai, J. W. GichukiA V. O. Ofulla and O. Jondiko( 2009) Improved Technology For Reduction Of Post-Harvest Losses In Rastrineobola Argentea “Omena/Dagaa” For Enhanced Food Security In The Lake Victoria Basin paper presented during the 2nd National Conference of Research For Dissemination of Results and Review of Innovations 4th -8th May 2009, Kenyatta International Conference Center 
• Masai Mutune, Elizabeth Birabwa Aliro Improving Information Communication And Outreach For Effective Fisheries Management; Repot presented during the 4th LVFO Outreach & Monitoring Mission- by the LVFO Executive Committee around the lake February 2006. Imperial Hotel Kisumu.
• Charo-Karisa, H., Munguti, J., Ouma, H., Masai, M.D., Opiyo, M., & Okechi, J.K., 2011. A fish farmer’s manual, for beginners, students and hatchery managers. Riverbrooks Communication Networks, Nairobi, Kenya P99 
• Charo-Karisa, H., Munguti, J., Masai, M.D., Opiyo, M., & Okechi National Nile tilapia Feed Standards. Submitted to KEBS 
• Charo-Karisa, H., Munguti, J. Masai, M.D., Opiyo, M., & Okechi KMFRI-CIRAD First Technical Report. 2008 
• KMFRI Aquaculture Research and Development Program, 2009 Technical Report No. 2, 89p. 
• Charo-Karisa, H., Munguti, J., Masai, M.D., Ouma, H., Okechi J., 2008. Meeting Fish farmers’ needs: Quality seed, affordable feeds and improved production systems. 
• Charo-Karisa, H., Munguti, J., Masai M.D., Ouma H., Okechi J., 2007. Selective fish breeding for quality seed to enhance aquaculture production in Kenya. Government of Kenya Aquaculture Seed Project Draft Report, 74p