1. Department of Physical Geography, Stockholm University, Stockholm, Sweden;
2. Institute of Marine Sciences, University of Dar es Salaam, Zanzibar, Tanzania;
3. Tanzania Fisheries Research Institute, Kigoma Centre, Kigoma, Tanzania;
4. Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, Uppsala, Sweden;
5. Department of Aquatic Sciences and Fisheries, University of Dar es Salaam, Dar es Salaam, Tanzania