1. Sustainable management of living natural resources in the aquatic aquatic environment:

Salt water surfaces, fresh water, sunset, are a natural environmental system, consisting mainly of a set of components with food chains that take pictures of food chains, so food may be the dominant element of the hydrological system, which consists either of aquatic or animal plants controlled by natural and chemical agents, whose effects vary from time to time.

Since fish, crustaceans and mollustaches are currently the most exploited natural resource components of the Egyptian aquatic environment and are thus of great economic and social importance both at the macro level and at the molecular level, the focus of this part of the study will be on these resources under the title of sustainable fisheries management.

The concept of sustainable fisheries management stems from the dynamic nature of these resources, which is a continuous exchange of generations over time involving the birth, growth and loss of successive generations through a discipline system that is automatically adapted to any change in environmental conditions. The exploitation of these renewable resources must be balanced with the process of restoring resources to the components of growth and reproduction. If this balance is not achieved, then three levels of exploitation are higher than the current compensation rates

1. Knowledge of the resources already available.
2. Understanding the productive characteristics of these resources.
3. Maintenance of the environmental system, which is one of its components.
Thus, fisheries are sustainable when the following factors are available:
- Be able to continue at an appropriate level of exploitation.
- To maintain the maximum ecological health of the water system.
- To maintain the biological diversity, structure and functions of the hydrological system on which they depend, as well as the quality of habitats such as coral reefs and mangrove trees, and to reduce the harmful or negative effects of the exploitation of such resources.

While natural environmental factors provide the conditions and possibilities for the existence and composition of the nature and characteristics of living resources, economic and social factors constitute the method, nature and level of exploitation of these resources. Thus, production in quantitative and qualitative terms becomes the function of prevailing natural, economic and social relations. Any change in the balance of these relationships will result in a change in the quantity and type of production.