Kainji Lake earthen smoking kiln

A field record from the Kainji basin

B. Meyboom’s FAO report on fish handling in the Kainji Lake basin describes several kinds of smoking oven observed during a visit to Nigeria from January to March 1974. Kainji Lake lies in western Nigeria within the Niger River system. The report describes the basin as savannah and records both oval and rectangular mud ovens, with some rectangular ovens grouped together. This variation matters: the report does not present one standardized kiln design for Nigeria.

The report says a typical oven contained one support on which fish rested during smoking and drying. It could be expanded metal or a steel rod frame with chicken wire, either incorporated into the structure or carried by rods set into the walls. A thin metal sheet—often flattened corrugated roofing—was commonly placed over the oven to retain heat. These are features of the observed kilns, not instructions for reproducing them.

The northern basin’s hourglass form

For the more northern parts of the Kainji Lake basin, Meyboom describes a different form as hourglass-shaped. Figure 3 in the report depicts a broad upper mouth, a narrowed middle and a widened lower body, with a mesh support across the opening and a small fire opening near the base. The generated illustration on this page follows that specific figure; it is editorial art based on a published drawing, not a photograph or archaeological reconstruction.

Meyboom offers possible explanations for the profile, not settled conclusions. He suggests that the upper part might fit around open-top, half-round baskets used to hold fish after smoking and drying, making re-drying easier. He also proposes that the narrowed profile might distribute hot air more evenly. The report explicitly presents these as possibilities for future research, so neither is stated here as a proven design purpose.

Use and historical limits

In the report’s 1970s account, wood supplied the heat and smoke for most fish drying around the lake, and the observed ovens supported both smoking and drying. The report’s wider discussion describes a local market for unsalted, strongly smoked fish, while noting different demands for fish sold nearby and fish transported farther. Those historical observations situate the kiln within a working fishery; they should not be read as current food-safety guidance.

A 2022 survey of farmed-catfish processors in 20 Kainji-basin communities found local banda kilns remained common. That study concerns contemporary local ovens in general. It does not identify those kilns as the hourglass shape illustrated in the 1975 report, and it cannot establish an uninterrupted history of this particular form.

What the sources do not specify

The FAO report gives no dimensions, wall thickness, foundation, mud recipe or construction sequence for the illustrated hourglass kiln. It also does not identify the exact village where the Figure 3 oven was recorded. This page describes the documented structure and its attributed context; it is not a construction plan. The report’s drawing credits no illustrator, and its image-rights status is not stated.