Abstract: A nutritional powder containing oligopeptide includes the following components by weight: oligopeptide powder 55-80%, fruit powder 5-30%, amino acid powder 0.5-5%, multivitamin powder 1.25-5%, mineral powder 0.25-3%, and compound sweetener powder 5-10%.

Abstract: A device for high density culture of fish larvae includes: a nursery tank, a first aerotube, a standing mesh drain pipe, and a dual-drain recirculating water treatment system. The nursery tank is a rounded corner tank or a polygonal tank without dead corners. The first aerotube is disposed around the bottom of the inner wall of the nursery tank. The standing mesh drain pipe is disposed in the center of the bottom of the nursery tank. The dual-drain recirculating water treatment system includes a first water treatment system and a second water treatment system. The first water treatment system and the second water treatment system are symmetrically disposed on both sides of the nursery tank, respectively. The first water treatment system is configured to purify upper layer water of the nursery tank, and the second water treatment system is configured to purify lower layer water of the nursery tank.

Abstract: A device for fish reproduction, hatching and larval culture including an aeration device, a first netted division plate, a second netted division plate, a first water pump, a first net cage, a second water pump, and a second net cage. When in use, the device is disposed in a pond. The pond includes a breeding area, a hatching area, and a nursery area, and each of the breeding area, the hatching area, and the nursery area communicates with the other two. The first netted division plate is disposed between the breeding area and the hatching area, and a first water recirculating loop is formed between the breeding area and the hatching area to drive water to flow from the breeding area to the hatching area, and back to the breeding area. The second netted division plate is disposed between the hatching area and the nursery area.

Abstract: A dark-bright integrated greenhouse system in intensive recirculating eco-aquaculture and aquaculture method thereof. The greenhouse system comprises a bright area and a dark area: the bright area is mainly a water-quality biological purification area, and the dark area is mainly an aquaculture area. The aquaculture method of the present invention is an intensive recirculating eco-aquaculture method, which can improve and regulate the eco-aquaculture environments like illumination and temperature suitable for growth and development according to the requirement of aquaculture species on illumination.