An improved marine life sanctuary assembly that is completely underwater and is designed to duplicate a natural mangrove that provides protection and promotes an underwater ecosystem, which can help reverse the decline in the fish population, aviary habitats, erosion, and the like and help to promote land and marine colonization.

An improved marine life sanctuary assembly that is completely underwater and is designed to duplicate a natural mangrove that provides protection and promotes an underwater ecosystem, which can help reverse the decline in the fish population, aviary habitats, erosion, and the like and help to promote land and marine colonization.

An artificial reef structure including thin tensile members as part of the structure. These tensile members readily accumulate marine life to create a more organic structure. The reef structure can accommodate a wide variety of ocean sensing and communication systems. Embedded lighting and electronic elements can be used to attract and monitor marine life.

Provided is an artificial reef, including a bottom plate, a reef main body of a hollow structure and connected to the bottom plate, and a pipe rack arranged in the reef main body. Two ends of the reef main body are open. All sides of the reef main body are obliquely arranged from bottom to top towards an inner side. The pipe rack is formed by assembling multiple pipe bodies into a grid shape. The pipe bodies are in communication with each other at intersections. Both ends of each pipe body extend through and are fixed to two sides of the reef main body respectively to communicate with the outside. The bottom plate and the reef main body are made of a reinforced concrete structure, and the reinforced concrete structure is made of high corrosion-resistant steel bars and modified seawater and sea sand concrete.

An algal reef includes ash powder obtained by burning coal or biomass and a hardening agent that has hardened through a chemical reaction in a state of being mixed with the ash powder. The hardening agent may contain at least one of slaked lime or gypsum hemihydrate. The algal reef may include at least one of granules containing calcium carbonate or gravel as an aggregate. The granules containing calcium carbonate may be produced by the reaction of calcium hydroxide with carbon dioxide in a carbon dioxide absorption facility. In the algal reef, pellets containing the ash powder and the hardening agent may be put into a liquid-permeable bag.

A method for restoring a fish habitat water flow structure, including step 1: obtaining water body information and dividing a to-be-restored water area to obtain a plurality of investigation areas based on the water body information, by a water body information management unit; step 2: sampling and shooting aquatic organisms at a target location in the investigation areas by a shooting device of an aquatic organism investigation unit so as to obtain an aquatic organism sampling map, obtaining fish information in the water body based on the aquatic organism sampling map, by the aquatic organism investigation unit; step 3: selecting an optimal restoration plan for the fish habitat water flow structure based on fish information and water body information, by a habitat selection unit; step 4: restoring the target water area according to the optimal restoration plan, by a habitat restoration unit.

The present disclosure relates to shaped cementitious compositions that comprise a substrate for aquatic flora and/or fauna attachment; methods for providing a substrate for aquatic flora and/or fauna attachment comprising depositing a shaped cementitious composition into a body of water; and methods for making a shaped cementitious composition. The shaped cementitious composition is formed from a pourable cementitious mixture comprising: (a) a pozzolan comprising a natural pozzolan and/or a manmade pozzolan; (b) MgO and/or Mg(OH).sub.2; (c) an aqueous solution comprising one or more accelerants; and (d) at least one aggregate. In some cases, the MgO and/or Mg(OH).sub.2 of (b) is included in the aqueous solution of (c). And, in various cases, the manmade pozzolan comprises a slag.