The Ethiopian Fisheries and Aquatic Sciences Association (EFASA) Proceedings of the 3 rd Annual Conference on Impacts of climate change and population on tropical aquatic resources 03 - 06 February 2011 Haramaya University Editors: Brook Lemma and Abebe Getahun Ministry of Science and Technology ~ i ~ Publisher’s page Third international conference on: Impacts of climate change and population on tropical aquatic resources held at Haramaya University from 03 - 06 February 2011 Conference organized and the proceedings published by the Ethiopian Fisheries and Aquatic Sciences Association , EFASA , a legally accredited professional association, Addis Ababa in 2011 Website : www.ss.aau.edu.et/index.php/ efasa -home Email : [email protected] Copyright : 2011 EFASA All rights of EFASA are reserved. Publisher’s note : Opinions in each paper or article included in these proceedings are opinions of the authors or speakers, and not of the publisher or EFASA. ISBN : Refer to articles in these proceedings as follows : Zenebe Tadesse (2011): Diel feeding rhythm, ingestion rate and diet composition of Oreochromis niloticus L. in Lake Tana, Ethiopia. In: Impacts of climate change and population on tropical aquatic resources , proceedings of the Third International Conference of the Ethiopian Fisheries and Aquatic Sciences Association (EFASA), editors: Brook Lemma and Abebe Getahun. AAU Printing Press, Addis Ababa. pp. 59 – 66. ~ ii ~ Table of contents Welcoming and introductory speech by Dr. Seyoum Mengistu, Vice President of EFASA 1 Opening Speech by Professor Belay Kassa, President of Haramaya University 6 The impact of climate change and population increase on Lakes Haramaya and Hora-Kilole, Ethiopia (1986 – 2006): Brook Lemma 9 Climate change challenges on fisheries and aquaculture: Dereje Tewabe 33 Climate change and wetland resources vulnerability: Impacts on livelihoods and opportunities for enhancing in Ethiopia: Lemma Abera Hirpo 50 Diel feeding rhythm, ingestion rate and diet composition of Oreochromis niloticus L. in Lake Tana, Ethiopia: Zenebe Tadesse 59 Development of small scale fish farming: for livelihood diversification in North Showa zone, Amhara Regional ~ iii ~ State: Yared Tigabu, Fasil Degefu, Aschalew Lakew and Gashaw Tesfaye 67 On station evaluation of fish offal fertilizer on Tomato and Onion: Alemu Lema and Abera Degebassa 84 Ecological assessment of Lake Hora, Ethiopia, using benthic and weed-bed fauna: Habiba Gashaw 99 Integrated fish-horticulture farm at Taltale in Debrelibanos, North Shoa Zone, Oromia, Ethiopia: Daba Tugie and Tokuma Nagisho 126 Fresh Water Fishes of Amhara Region: Belay Abdissa and Alayu Yalew 136 Fish species composition, abundance and production potential of Tendaho Reservoir in Afar Regional State, Ethiopia: Gashaw Tesfaye, Abebe Cheffo and Hussien Abegaz 164 Integration of fish culture with water harvesting ponds in Amhara Region: a means to supplement family food: Alayu Yalew 191 Technology Development and Dissemination Where There is No Cultural Practice: Lessons from On Farm Aquaculture Research in Amhara Region, North West ~ iv ~ Ethiopia: Berihun T. Adugna and Goraw Goshu 200 Atelomixis as a driving force of phytoplankton assemblages in an African-highland Lake Hayq, Ethiopia: Tadesse Fetahi, Michael Schagerl and Seyoum Mengistou 221 Preliminary survey of Kurit-Bahir Wetland, (management focus), Amhara Region, West Gojjam, Mecha Woreda, Ethiopia: Miheret Endalew Tegegnie 256 Detection of toxigenic cyanobacteria in Bahir Dar Gulf of Lake Tana–pilot study: Ilona Gagala, Goraw Goshu, Tomasz Jurczak, Yohannes Zerihun, Joanna Mankiewicz-Boczek and Maciej Zalewski 271 Lake Tana’s (Ethiopia ) endemic Labeobarbus spp. Flock: An uncertain future threatened by exploitation, land use and water resources developments: Brehan Mohammed, Martin de Graaf, Leo Nagelkerke, Wassie Anteneh, and Minwyelet Mingist 285 ANNEX : Program of the 3 rd Annual Conference of the Ethiopian Fisheries and Aquatic Sciences Association (EFASA) 298 ~ v ~ Acknowledgements The Ethiopian Fisheries and Aquatic Sciences would like to extend its gratitude to the sponsoring institutes, namely, Food and Agricultural Organization Sub-Regional Office for East Africa , Haramaya University , Ministry of Science and technology , Horn of Africa Regional Environment Center and Network and Addis Ababa University . These sponsoring institutes have enabled professionals in the field to meet and exchange current knowledge developed in the country and elsewhere; and created the platform where regional administrators (from Oromia and Harari), research officers, local fishermen, and school children selected from three high schools had the opportunity to listen and discuss on the interface of contemporary scenarios regarding the water, climate and population issues. The publication of these proceedings will also spread out the knowledge to those found all over Ethiopia and the global community that have stakes in the sustainable use of water. The day-to-day activities of organizing of the workshop was humbly undertaken by Eshete Dejen , Seyoum Mengistou , Abebe Getahun , Tesfaye Wudneh , Mesikir Tessema , Tadesse Fetahi , Zenebe Tadesse , Aschalew Lakew , Yared Tigabu , Gashaw Tesfaye , Akewak Geremew , Ashagrie Gibtan , Mengistu WoldeHana , Sintayehu Workineh , Tsehaynesh Lemma , Neway Andargie and Brook Lemma . The editors Brook Lemma and Abebe Getahun ~ vi ~ P a g e | 1 Welcoming and introductory speech by Dr. Seyoum Mengistu Vice President of EFASA I ask all of you to stand up for a minutes of silence in remembrance of our colleague and dedicated EFASA member, Ato Abera Degabussa, who passes away after a short illness on 22 Miazia 2001 E.C. Abera received his BSc from Ambo College and his MSc from, the former Soviet Union and was an ardent and dedicated researcher, with tangible contribution to the development of the Lake Langano and east Showa fisheries. The Zwai Fish Resource Research Center, of which he was a member, and EFASA miss him a lot and we extend our deepest condolences to his family and friends. A minute of silence Good morning everyone and welcome to the THIRD EFASSA annual conference which is being held in Haromaya University and in place which I also happen to know and cherish in childhood. I am extremely elated and sentimental about this occasion – coming home to roost after nearly half a century of absence, like the proverbial lost son. I started school in Harar Bethlehem School, not more than 20 kms from here, and I remember that we used to visit this university once in while back then. As a child I used to be fascinated by college education and the fantastic facilities that students used to enjoy then, Alemaya University was then funded by Oklahoma State University (USA). They use to dispense hot milk from taps, and although this is not possible now, I am still impressed by the visible strides that Haromaya University has achieved through improved campus infrastructure and the education environment. First and foremost, I would like to thank on behalf EFASA, the University for hosting us, and in particular, the President, Prof. Belay Kassa for his generous and gracious patronage and facilitating the realization of this conference here at HU. Dr. Brook Lemma, through his long association with HU (Being the acting executive at some time) also deserves special mention for making our conference here a resounding reality, at such short notice after EFASA decided to change its annual venue to Haromaya instead of Ambo University. We all realize how difficult it is to coordinate national meetings, and the close camaraderie between Dr. Brook and HU officials has been an uncommon blessing and a rare opportunity. Let me also take this opportunity to thank other HU officials who were crucial to make our venue here a reality, including, the 4 vice presidents (Dr. Tena Alamerew, Academic Vice President, Dr. Belayneh Legesse, Vice President for Business and Administration, and Dr. Kebede Wolde EFASA: Impacts of climate change and population on tropical aquatic resources (2011) P a g e | 2 Tsadik, the Vice President for Development and Community Engagement and Dr. Negussie Dechasa, Vice President for Research). The local organizing committee at HU chaired by Ato Mengistu Woldehanna, Ato Shimellis and Ato Abiy deserve our special thanks for organizing everything so smoothly and efficiently in such a short time. It makes me feel that the efficiency I used to see at HU half a century ago is still here (even if the Americans I alluded to earlier had long left). HU is truly emerging as one of the most efficient and steadfast universities in our country, added to its status as one of the oldest college institutions also. Let me briefly say a few thing about EFASA even though most of us know these issues quite well. Like any society/association, EFASA was borne out of the initiative of a few vanguard members about 4 years ago in2007, to be exact 12 founding members who were mainly professional in the Limnology, Fisheries Biology and Aquatic Ecology disciplines. In the past three yeas EFASA has managed to conduct one launching workshop and two national conferences at Zwai and Bahir Dar. It also goes to the credit of EFASA that it was able to host the Pan-African Fish and Fisheries (PAFA) Conference at the ECA Conference Hall. This is one of the prominent professional associations on African fishes and fisheries that holds its conference once in five years. EFASA had the pleasure of hosting international scientists numbering over 250