The authors express deepest gratitude to Dr. A.O. Maluwa
for his materials which were used for making the hapas as
well as his tireless and timely assistance whenever needed.
Many thanks should also go to Dr. J. Kango’mbe for his
assistance. Authors are also very thankful to the Bunda Fish
Farm staff led by Mr. Chaggwa, the Farm Manager and the Chief Technician Mr. Nyali for assisting with laboratory
work