The article presents the traditional milkfish culture practices. The different types of culture ponds are classified according to their uses. Pond preparation, stocking density, pond management and harvesting practices are also discussed.

The article discusses Nereistoxin, a toxin isolated from marine annelids, its pharmacological and agricultural applications are discussed in the article.

The research was conducted to determine the toxicity of extracts from five Philippine species of marine sponges on tilapia Oreochromis niloticus fry. It was found out that the most potent was the methanol extract of Dysidea herbacea, it kills with the least toxin and at the shortest time.

The document illustrates the processes on the isolation of bioactive compounds from marine organisms and the production of marine drugs.

Research in the application of fundamental concepts of fish behaviour to aquaculture has intensified recently and this chapter further elucidates fish sensory systems and functions and their involvement in the success or failure of hatchery and farm operations. Most marine fishes hatch with rudimentary sense organs that are elaborated by the time of first feeding and further improved with growth; thus, hatcheries must have the appropriate food, light and water currents for proper larval development. In grow-out farms, the ambient conditions must be at optimum or tolerable levels for the fish stock and the diets must have the right sensory characteristics to stimulate efficient feeding. Stressors for fish sensory systems include crowding, turbidity, underwater noise, chemotherapeutants, extreme pH, gas supersaturation and infection. High-density farms are stressful because the fish can sense, but cannot escape from, unfavourable conditions. Monitoring fish behaviour provides early warning of stress and disease and helps avert mortality and financial losses in aquaculture.

The article discusses some strategies in the establishment of a mangrove genetic garden where species could be maintained. The genetic garden is a sustainable way to prevent further damage of the remaining mangroves. Its prime function is the protection and conservation of mangroves for sustainable use.

The article presents action plans that could be done to stop and prevent further degradation of the mangrove ecosystem. These action plans are: conservation, mangrove reforestation and the practice of ecologically sound aquaculture.

The article presents the forestry, fishery and ecological values of mangroves. Studies on the measurement of the economic value of mangroves that were conducted in Thailand, Indonesia and Ecuador are also presented.