This document summarizes the goals and approach of the Livestock and Fish research program. The program aims to improve access to animal-source foods like meat, milk, and fish for poor communities through research focused on increasing productivity and market access for small-scale livestock and aquaculture production systems. The program will work on selected value chains in target countries, addressing constraints across the entire chain from inputs to consumers. The goal is to generate solutions that development partners can implement at large scale to benefit both producers and consumers.