I highly recommend this technical paper published by the Food and Agriculture Organization of the United Nations. It provides a complete reference for small scale aquaponics and shows how to build three small scale systems using IBC Totes.
Somerville, C., Cohen, M., Pantanella, E., Stankus, A. & Lovatelli, A. 2014.
Small-scale aquaponic food production. Integrated fish and plant farming.
FAO Fisheries and Aquaculture Technical Paper No._589. Rome, FAO. 262 pp.
I’ve attached a PDF of the “Aquaponics quick reference handout” which begins on page 249 of the technical paper. This 18 page handout presents the chapter summaries and key technical information. Read this first to get an overview of the entire paper.