Biology and management of fish stocks in Bahir Dar Gulf, Lake Tana, Ethiopia

T. Wudneh

Research output: Thesisinternal PhD, WU

Abstract

<p>The biology of the fish stocks of the major species in the Bahir Dar Gulf of Lake Tana, the largest lake in Ethiopia, has been studied based on data collected during August 1990 to September 1993. The distribution, reproduction patterns, growth and mortality dynamics and gillnet selectivity of these stocks are described.</p><p>The major fish categories, <em>Barbus</em> spp., <em>Clarias gariepinus,</em> and <em>Oreochromis niloticus</em> contribute equally to the catches. <em>O. niloticus</em> is most abundant in the shallow littoral zone, while <em>C. gariepinus</em> and the larger piscivorous <em>Barbus</em> species are found mainly in the deeper open water area of the lake. These larger species are mainly exploited by the motorized boat fishery. The catch from the reed boat fishery, confined to the littoral zone, consists mainly of <em>O. niloticus</em> and <em>Barbus tsanensis.</p></em><p>The breeding activity of all major species is associated with the rainy period and increase in lake water level. <em>C. gariepinus</em> has a short breeding period in July whereas <em>O. niloticus</em> and <em>B. tsanensis</em> show extended activity with peak breeding during July and September-October respectively. They are fully recruited to the fishery at 2 - 4 years of age well beyond the age of maturity. During the breeding period a higher catch rate is observed for <em>Barbus</em> species.</p><p>The sustainable potential yield of 32 kg.ha. <sup>-1</SUP>.yr. <sup>-1</SUP>estimated for the Bahir Dar Gulf area, indicates that there is scope for some expansion of the fishery. The shortage in fish storage, distribution and marketing facilities, the limited local market and lack of fishing tradition are major constraints to the development of the fishery.</p>
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
Supervisors/Advisors
  • Huisman, E.A., Promotor
  • Machiels, M.A.M., Promotor, External person
Award date22 Jun 1998
Place of PublicationS.l.
Publisher
Print ISBNs9789054858867
Publication statusPublished - 1998

Keywords

  • fishes
  • management
  • fishing
  • lakes
  • fishing vessels
  • stability
  • equilibrium
  • ecology
  • resource management
  • natural resources
  • use efficiency
  • ethiopia
  • fishing grounds
  • fish catches

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