Phenotypic data for Astatotilapia cf. bloyeti from Lake Chala, fish were collected in fall 2014. Data includes individual ID number (column A), number of circuli (as an age estimate, column B), depth of capture (C), wet weight (D), genus (E), capture site (F), morph assignement (G), linear morphological distances (H to V), mitochondrial haplotype (W), stable isotopes (X-Y), intestine length (Z), volumetric proportion of prey items in the stomachs (AA-AL), fullness index of the stomachs from 1 (empty) to 5 (full, AM), and colouration (AN-AU).