Fish are a major food source for many of the world’s population, however, many fishing practices can be detrimental to the environment. One of these negative impacts is called by-catch.  Philippe travels to the Plymouth Fishmarket to learn about quotas and how this can impact fish populations. Different fish species have different life cycles and histories, which is something that also needs to be taken into account in order to properly manage fish stocks. Impacts from mismanaged fisheries can be seen around the world, Philippe sets out to find out what is being done to protect this vital resource.