


Robyn and Brandt's cultural and scientific journey to Tanzania.
The next morning I headed down to the research station to go out on the lake. We loaded up gear into a long wooden boat with an outboard engine and cruised down Mwanza Gulf to Baraka’s field site near the mouth of the Isanga River. It was breathtaking- miles of virtually untouched hilly shoreline covered in these awesome rock formations. Unfortunately, I didn’t have my camera because I couldn’t risk getting it wet (which I would have for sure). Baraka is studying how nearshore plants filter and alter the quality of the water entering the lake from the river and the watershed. One of these plants is water hyacinth, which is native to South America and invasive in Lake Victoria. In the late 1990s, this plant, which grows in these huge floating mats, was choking almost all the bays and nearshore areas of the lake causing major problems with on-lake transportation, fishing, water in-takes, etc. It declined through the early 2000s and is now rebounding. My interest is in the affect of these plants on water flow into the lake. We got to the bay into which the river flows to find that a huge, island-sized mat of water hyacinth, papyrus and reeds growing 2 meters tall had floated across and completely blocked the entrance sometime in the last 2 days since Baraka was last there. We cruised to a tiny lakeside village where people probably subsist mostly by fishing and only access to the rest of the world via the lake and hired 3 dudes with machetes. We took them back to the site and they climbed up onto the mat and started hacking away at the plants to make a passage for our boat. Imagine cutting down shrubs with a machete while standing on air mattress that you float on in a swimming pool that’s covered with broken tree branches. When they got a chunk loose, they tied it up and we dragged it away with the boat. It took hours just to cut it down enough so that we could push and pull the boat across the top of the vegetation for 20 feet to the channel of open water on the other side of the mat. It was arduous work and these guys all cut up and soaking wet. We collected the samples, saw a baby crocodile and headed back out through the path to find another island of vegetation was closing up the bay further out. There was only a boat width left for us to pass through and just after we crossed out to the open water we watched this “island” move across and seal off the bay. If we had taken 2 minutes longer, they would have had to hack a path through this island too. Insane. We dropped the guys off at their village and stopped along the way back to research station to buy fresh Nile tilapia from local fisherman who were in some cases out fishing on nothing more than a few tree branches tied together with vines just big enough to sit on and only partially floating in this lake where there are massive Nile crocs. We arrived back at the research station just as the sun was starting to set. It was a great great day!!