Inline Saturator for Open-Body Fish Cage Oxygenation

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Solution Overview

Problem

Open-water fish cages face rapid variations in dissolved oxygen levels due to phytoplankton respiration and deep water upwelling, leading to aquatic hypoxia, stress, and high mortality rates among caged fish, especially during feeding and medical treatments.

Innovation Solution

A method involving an inline saturator system that restricts water movement and injects oxygenated water into fish cages to maintain elevated dissolved oxygen levels and reduce nitrogen gas, while allowing for manual override during treatments to ensure high oxygenation and medicinal substance delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If fish are densely caged to increase productivity, then fish production per volume increases, but dissolved oxygen levels drop and mortality risk increases

Engineering Contradiction:

Improvefish production per volumeVSAvoidfish survival

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The cage is divided into an enclosed interior volume and an exterior environment, with a controlled water exchange system that segments the oxygen-depleted interior from the oxygen-rich exterior, allowing independent control of oxygen levels within the cage

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A water exchange system acts as an intermediary between the exterior oxygen-rich water and the interior fish habitat, mediating oxygen transfer through controlled water circulation and gas infusion to maintain adequate oxygen levels without requiring complete water replacement

Inventive Principle:

Principle #24Intermediary (Mediator)

2Temperature

If water is freely exchanged with the environment, then oxygen levels may be maintained, but nitrogen gas accumulation and water quality degradation occur

Engineering Contradiction:

Improvedissolved oxygen levelVSAvoidnitrogen gas accumulation

Core Design Contradiction:

TemperatureVSObject-generated harmful factors

Solution Approach 1:

The system applies different water management strategies to different zones: the enclosed cage interior maintains high oxygen levels through gas infusion while the exterior allows natural water exchange, creating localized quality differences that prevent nitrogen accumulation inside the cage

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Oxygen gas is infused at high concentrations into the cage water to create strongly oxidizing conditions that prevent anaerobic decomposition and nitrogen gas accumulation, accelerating the oxidation of organic matter and maintaining water quality

Inventive Principle:

Principle #38Strong oxidants (Accelerated oxidation)

3Reliability

If medical treatment is administered to fish, then disease control improves, but oxygen consumption increases and mortality risk increases

Engineering Contradiction:

Improvedisease controlVSAvoidoxygen consumption

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Oxygen infusion is initiated before and during medical treatment administration to preemptively address the increased oxygen demand caused by treatment stress, preventing hypoxia before it occurs rather than reacting after oxygen levels drop

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system provides a cushion of excess oxygen capacity by maintaining dissolved oxygen levels well above the minimum survival threshold during treatment, creating a buffer that absorbs the additional oxygen demand from treatment-induced metabolism without pushing fish toward mortality

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach maintains stable and elevated dissolved oxygen levels within fish cages, reducing stress and mortality risks during normal operations and treatments, and enhancing treatment efficacy by promoting calm behavior in fish through serotonin release.

Implementation Method 1

injecting oxygenated water produced by an inline saturator into the portion of water to raise a dissolved oxygen level and to lower a dissolved nitrogen gas level therein

Methodology Applied

Scientific EffectGas infusion:

Implementation Method 2

produced by an inline saturator

Methodology Applied

Scientific EffectGas dissolution: Absorption (physical)

Data Source

PatentUS11805762B2Process for controlling the concentration of dissolved oxygen within a specified open body of water

Publication Date: 2023.11.07 GIS GAS INFUSION SYST INC

AI summary

There is provided processes and uses of an inline saturator for maintaining fish in a cage in an open body of water, the process comprising: restricting movement of water into and out of a part of the cage and forming a portion of water within the part of the cage. The process also includes injecting oxygenated water produced by an inline saturator into the portion of water to raise a dissolved oxygen level and to lower a dissolved nitrogen gas level therein. A treatment process is also provided that includes the steps noted above and further including introducing a medicinal substance into the oxygenated water or the portion of the body of water.