These are not books but icthyological works on various groups within the very large genus Crenicichla. Some are useful to aquarists like myself, but are aimed at actual icthyologists. At least the 1st includes pictures of live specimens, which may be useful to you. I believe the links should be live, as they are for me. Enjoy, Francisco. [One day, "the book on Crenicichla will be available!]
[HTML] Phylogenomics of pike cichlids (Cichlidae: Crenicichla ) of the C. mandelburgeri species complex: rapid ecological speciation in the Iguazú River and high ...
[HTML] A review of the species of Crenicichla (Teleostei: Cichlidae) from the Atlantic coastal rivers of southeastern Brazil from Bahia to Rio Grande do Sul States, with…