Livewell Oxygen Injection
Texas Parks and Wildlife Department
Inland Fisheries Division
San Antonio District Office
•Dissolved oxygen is the single-most
critical factor for maintaining health of
black bass retained in livewells.
•Various oxygen equipment was tested
to determine a simple, effective, and
safe system for maintaining desirable
dissolved oxygen (>7.0 mg/l) in
•This presentation recommends system
components and describes installation,
operation, and safety.
Complete oxygen injection system
•Custom engineered for livewell oxygen injection by Premier Industries.
•Industrial grade and not considered a medical device by FDA or Texas Department
of State Health Services.
•CGA540 inlet and ¼” barb outlet.
•Fixed-flow, LPM is factory pre-set to 0.1.
•Dual-stage design which maintains LPM at 0.1 in response to changing PSI.
•High quality PSI gauge which indicates fullness of oxygen bottle.
Appropriate size oxygen bottles and specifications
Number of 8 hour
fishing days for full
MD or D 15 ft3
4.4 20 20
M9 or C 9 ft3
4.4 14.2 12
•Use of a CGA540 valve permits use and refill with
welding grade oxygen. Use of medical grade
oxygen is by prescription only.
•Bottle top will often be painted red by oxygen
supplier to indicate its filled with welding grade
•Securely mount bottle protecting it and the regulator
from impact and excessive vibration.
•Consider different bottles sizes when choosing
•Its preferable to route oxygen hose on port side of boat
away from wiring and cables located on starboard side.
•Do not locate bottle in boat bilge or in compartments
containing oil, gas, or batteries.
•Remove oxygen bottle from boat when not planning to
bottle mounted with fire extinguisher
bracket in compartment under seat
bottle mounted with fire
extinguisher bracket under console
5 lb. fire extinguisher bracket
and large hose clamps
bottle mounted in wood box
in compartment under seat
•There are no federal or Texas regulations specific to use and storage
of oxygen equipment on recreational fishing boats.
•Aluminum bottles require re-testing every 5 years
•Oxygen by itself is not flammable, however the pure form is a
dangerous accelerant and highly reactive to oil-based products.
•Do not smoke around oxygen equipment
•Do not use products containing oil on or around oxygen equipment (e.g.
WD-40, silicone, etc) or combustion of these may occur.
•Test all connections with soapy water to ensure there are no oxygen
leaks before use.
•Cable/zip ties were inadequate
•Use hose clamps or more secure connectors
•Frequently re-check hoses and connections for leaks and damage
•Do not fill oxygen bottle from another bottle (i.e. transfill). Bottle or
valve failure could result.
1/4“ barbed tee
•Most modern bass boats have two independent livewells. The single
oxygen line from the regulator is split to form two lines to facilitate oxygen
injection into both livewells.
•This “T” connection should be made as
as near as possible to where oxygen
will be routed thru the rear wall of
•Durable ¼ “ ID reinforced hose should
be used between the regulator and
•The hoses running from the tee to the
livewell wall fittings should be equal
¼” barbed tee
rear wall of livewell
•Use the soft, flexible hose inside
livewells to allow diffusers to
remain stable and upright.
•Use equal length hoses inside
•Use teflon tape on threaded
livewell wall fittings
•Turn the knob counterclockwise on the CGA540 valve to inject oxygen. Turning the
valve clockwise will shut-off oxygen flow.
•Diffusers will take 3-4 minutes to pressurize before producing oxygen bubbles.
•Both livewells will need to be filled with water for diffusers to function properly. If
one livewell is filled and the other left empty, all oxygen will flow out the diffuser in
the livewell having no water because this is the path of least resistance.
•Recirculation (air-water mixing) can be used simultaneously with oxygen injection,
however oxygen in excess of saturation level with be volatized off.
•The surface of the diffusers can be cleaned using fine grit sandpaper if dirt or build-
up hamper performance.
•Safety should be the primary concern if modifying system or
•Lower quality diffusers are much less efficient and may not achieve desired
oxygen level at the recommended oxygen injection rate of 0.1 LPM.
•More information on livewell oxygen injection
•Other proven livewell management techniques
• Cooling the water
• Addition of stock salt
• Periodic water exchanges
Overall Livewell Management
Component, Cost, and Supplier list
Costs do not include shipping or tax, prices are subject to change. Equivalent items are available from other vendors.
Item Part Number Cost($) Supplier
Aluminum Oxygen Bottle
capacity (M9) with standard CGA540 valve T540M9 62.95 Cramer Decker Medical
capacity (MD) with standard CGA540 valve Y540MD 70.95 (877) 222-0200
Oxygen Regulator (Model 4700) Premier Industries
CGA540 inlet, 1/4" barb outlet, flow set at 0.1 LPM 50-11530-01 contact
Oxygen Fill AirGas
Welding grade oxygen 11.00 or Other Local Supplier
Bottle Mounting Bracket Hallmann Sales
Larsens 5lb fire extinguisher bracket 821 23.99 hallmann-sales.com
Diffusers, Fittings, Tubing, and Clamps
2- oxygen diffusers 1PMBD075 108.00 Pentair-Aquatic Ecosystems
5 ft. ¼” ID black vinyl tubing BTV40 2.55
15-20 ft. ¼” ID reinforced clear vinyl tubing TVR40 19.40
1 - ¼” tee (barb) connector 62064 .78
2- 4” hose clamps for fire ext. bracket SSI 4.30
10 - ¼” stainless steel hose clamps SSAA 9.80
2 - ¼” barb X ¼” MIP hose barb adapters 903-401001 6.72 Home Depot
2 - ¼” barb X ¼” FIP hose barb adapters 903-691001 6.22
•We thank the following for their assistance and comments.
•James and Tom Bendele (Falcon Lake Tackle)
•Ken Parker (Boerne Marine)
•Rick Pierce (Bass Cat Boats)
•Gene Gilliland (Oklahoma Department of Wildlife Conservation)
•Carl Wengenroth (Angler’s Lodge)
TPWD-Inland Fisheries, District 1D
12861 Galm Rd.
San Antonio, TX 78254