This document analyzes the trailer for the film "Fish Tank" through the lens of film theory and conventions of social realist films. It finds that the trailer adheres closely to social realist conventions through its portrayal of poverty, violence, stereotypes of the working/lower classes and themes of family dysfunction. Specific techniques like costume, setting, lighting and music help establish the mood of disequilibrium and explore themes typical of the genre. While providing information about the film, the trailer leaves some unanswered questions and requires further research, departing slightly from standard conventions.