If you are looking for something to trap shrimp then this could be the answer. It is a cylinder net and it is specifically designed for catching shrimp. It has a collapsible trap that is sprung. It is really easy to store when not in use. It is also otter friendly so there is no risk of harming the mammals when you are trying to catch the shrimp. It is 30 x 60cm and has a 12cm entrance hole which is oval. They are really easy to use and a great way for those starting out to catch fish. They are lightweight as well but if you put them in fast-moving water you may need to weigh them down, perhaps with rocks.