Is it illegal to fish in a retention pond?

It depends on the local laws and regulations. In general, it is not illegal to fish in a retention pond as long as it is not posted as a no-fishing area or if there are no restrictions in place. However, some retention ponds may be privately owned or have specific rules and regulations regarding fishing, so it is important to check with the local authorities or the property owner before fishing. Additionally, some states and municipalities may have specific regulations regarding the size, type, and number of fish that can be caught in a retention pond.