This has caused some confusion about what essential habitat is and how it can be effectively managed. Essential habitats need to be, defined for each managed species to be useful. Without such definitions, anywhere an organism is found or could be found might qualify as an essential habitat. Specifically we note that specific phases during the life history of lobsters require specific habitats and such linkages have a disproportionately great impact on lobster populations.
Some organisms require a specific habitat at a critical phase in their life.
The linkage between a species and a specific habitat may functionally control the carrying capacity of the environment for that species. For lobsters, there is considerable research suggesting habitats supporting broodstock lobsters and those that serve as nursery grounds are most essential. Broodstock habitats include spawning areas and habitats lobsters use while their eggs develop externally on their abdomen. Rough handling during this phase can cause spontaneous abortion. Broodstock lobsters are most abundant in deep water and off shore locations especially in the winter but their exact habitats are unknown.