All posts regarding the care and breeding of catfishes from other parts of the world (North America, Europe and Australia). If you don't know where your catfish is from, post a query in the identification category.
the book is: "The endemic cichlids of Madagascar" (original: 'les cichlides endemiques de Madagascar' with accents on some e's which I don't have on my keyboard) by Patrick de Rham and Jean-Claude Nourissat
ISBN 2-9513502-0-2, december 2002
the Arius in question is portrayed on page 152 2 pictures which show 3 fish, they are freshly fished and still alive or only recently dead
picture #1: the 2 bigger ones are lying in a woven basket; given the size of reed those baskets are usually made of, I'd say the catfish have a TL of 25-30 cm they have orange fins, apart from the dorsal, a silvery body with metallic small bands on the upper half of the body, and the typical headshape of Arius
they're definitely not Anchariids.
picture #2: this somewhat smaller fish is handheld, most likely by the fisherman that caught it; it's a local (Malagasy people are quite dark and both writers are white Europeans) the fish is anything between 20-25 cm TL and contrastingly banded on both upper half and lower half of the body; interesting is that the bands are staggered; the markings are quite visible
checking the proportions, this is likely a subadult or younger fish when compared to the larger ones in pic 1.
the accompanying text states that this species is a freshwater species and according to local fishermen it mouthbreeds the eggs. which fits from what we know about Ariidae in general.