A scraper apparatus, comprising a scraper blade; a scraper blade holder; wherein the scraper blade and the scraper blade holder are rotatable relative to one another about a pivot connection formable by the scraper blade and the scraper blade holder; wherein the scraper blade has at least one scraper blade fastener; wherein the scraper blade holder has at least one scraper blade holder fastener; and wherein the at least one scraper blade fastener is fastenable with the at least one scraper blade holder fastener via the scraper blade and/or the scraper blade holder being rotated about the pivot connection.

A smart aquaculture method is provided for an aquaculture system including a breeding pool, a feeding machine and a camera disposed in the breeding pool. The method includes: taking an underwater image by the camera; calculating a feed remaining amount according to the underwater image; and controlling the feeding machine according to the feed remaining amount to dispense feed to the breeding pool.

A system is provided for automatically removing deceased fish from an aquaculture cage. The system may include an underwater robotic vehicle configured to traverse the aquaculture cage to collect mortalities. The mortalities, once collected, may be brought to a system dock and then removed from the cage.

A system is provided for automatically removing deceased fish from an aquaculture cage. The system may include an underwater robotic vehicle configured to traverse the aquaculture cage to collect mortalities. The mortalities, once collected, may be brought to a system dock and then removed from the cage.

An aquatic weed planting plate for an aquarium is provided. The aquatic weed planting plate for aquarium includes a plate body and at least four feet. A plurality of planting holes is formed in the plate body at intervals. A plurality of dirt collecting holes is formed around each planting hole. The plate body is provided with fixing devices for fixing aquatic weeds, and each fixing device corresponds to one planting hole. The fixing device includes a fixing sleeve, two clamping members and a luminous ring. The plate body is provided with nets for collecting dirt, each net corresponds to one dirt collecting hole, the lower portion of each net is provided with a connecting tube; a plurality of conveying pipes is also arranged below the plate body, each conveying pipe is communicated with the plurality of connecting tubes, each connecting tube is communicated with the corresponding conveying pipe.

An aquatic weed planting plate for an aquarium is provided. The aquatic weed planting plate for aquarium includes a plate body and at least four feet. A plurality of planting holes is formed in the plate body at intervals. A plurality of dirt collecting holes is formed around each planting hole. The plate body is provided with fixing devices for fixing aquatic weeds, and each fixing device corresponds to one planting hole. The fixing device includes a fixing sleeve, two clamping members and a luminous ring. The plate body is provided with nets for collecting dirt, each net corresponds to one dirt collecting hole, the lower portion of each net is provided with a connecting tube; a plurality of conveying pipes is also arranged below the plate body, each conveying pipe is communicated with the plurality of connecting tubes, each connecting tube is communicated with the corresponding conveying pipe.

A scraper apparatus, comprising a scraper blade; a scraper blade holder; wherein the scraper blade and the scraper blade holder are rotatable relative to one another about a pivot connection formable by the scraper blade and the scraper blade holder; wherein the scraper blade has at least one scraper blade fastener; wherein the scraper blade holder has at least one scraper blade holder fastener; and wherein the at least one scraper blade fastener is fastenable with the at least one scraper blade holder fastener via the scraper blade and/or the scraper blade holder being rotated about the pivot connection.

An integrated method for clearance, collection and capture of internal pollutants and algae at the bottom of a lake include the following steps: selecting areas where the pollution level is high, and organic or inorganic particulate matter is prone to accumulation and carrying out trenching operations at the bottom of the lake to form a plurality of traps; and removing the sludge and algae inside the traps and clearing the sediment inside the traps, for subsequent internal pollution control when the surface-layer sludge on both sides of the traps almost fills up the traps. This method makes use of the hydrodynamic disturbances of waves formed by natural wind energy and lake currents to continuously transport sludge with a high pollution level and a small specific gravity and algae in the surface layer of the lake bottom, which are rich in organic debris, to artificially built traps.

An integrated method for clearance, collection and capture of internal pollutants and algae at the bottom of a lake include the following steps: selecting areas where the pollution level is high, and organic or inorganic particulate matter is prone to accumulation and carrying out trenching operations at the bottom of the lake to form a plurality of traps; and removing the sludge and algae inside the traps and clearing the sediment inside the traps, for subsequent internal pollution control when the surface-layer sludge on both sides of the traps almost fills up the traps. This method makes use of the hydrodynamic disturbances of waves formed by natural wind energy and lake currents to continuously transport sludge with a high pollution level and a small specific gravity and algae in the surface layer of the lake bottom, which are rich in organic debris, to artificially built traps.

System for treating inner walls of aquatic basins, including at least one working head, a mobility assembly for moving the working head along a wall to be treated, the working head having a working disc arranged in a rotational manner and connected to a rotary shaft which can be driven by a disc motor, the working disc bearing a wall contact foam having a plurality of radial slots connecting the center of rotation of the disc to the periphery of the disc.