Water circulation apparatus and method
US6659044B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 2001 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Jul 5, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A40/81
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus and method for conditioning water in open fish breeding cages, which can solve the problems of “bloom of harmful seaweed” and the “lack of dissolved oxygen concentration in the water”. The apparatus includes a tube having adjustable open upper and lower ends and an impeller for drawing a major water flow in either direction through the tube. To solve the “bloom of harmful seaweed” the apparatus draws water upward from deeper water with low algae concentration to the bloom zone, dissolving and moving the harmful seaweed far away from the cages. To solve the “lack of dissolved oxygen concentration” the apparatus draws water downward from the surface water having high concentrations of dissolved oxygen to deeper water with low concentrations of dissolved oxygen, increasing the dissolved oxygen concentration in the middle and the bottom of the cages, where the biggest oxygen consuming fish concentration are located.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.