Abstract: This invention discloses an ecological culture method for fish that contains marine barracuda, which places the marine barracuda fry in natural seawater, uses circulating water to dilute the natural sea water step by step, and domesticates the marine barracuda with fresh water; when the salinity of the water body is reduced to 3‰, transferring the fry to the fish culturing pond, and then the freshwater species are introduced, and the ecological culturing and ecological poly-culture model is carried out; during the culturing period, checking the growth of barracuda, adjusting the feeding and/or feeding times, and therefore barracuda reaches the required specifications within the expected time to be on the market.

Abstract: The present invention relates to a method for protecting the ecology of a coastal mudflat and a system used in the method. The method includes the following steps: plan and design a pond project according to the specific conditions of the target coastal mudflat to be protected; dig a trench and build a dike in the surface of the target coastal mudflat and enclose the dike to form at least one pond, wherein the trench in the pond is adjacent to the surface of the mudflat to form the pond with a large water surface, a shallow water layer and a seasonal open waterfront; and cultivate an aquatic product in the trench, with or without an emergent aquatic plant planted in the surface of the mudflat.