Surface

aerators
Surface

aerators

cannot


quickly

compensate


for


these


sudden


shifts


and

thus


cannot


consistently


maintain
adequate
DO

concentrations


in


the


top


layer


where


the


cage

with


a

high


density

of


fish

is


located.


Therefore,
aquaculturists
growing


fish

in


cages

in


water


bodies


deeper

than


6

ft.


must


consider


this

risk

and

be

prepared
to

immediately


supply


supplemental


oxygen


to


the


fish.


Pure

oxygen


or


additional


emergency


aeration

can

be
provided

directly,


or


the


cage

can

be

surrounded

with


a

plastic


tarp


and

pure


oxygen


can

be

provided


via


air
stones

inside

the


cage

until


the


surface


aerators

can

increase


the


DO

throughout


the


water


body.
Turnover

of


water


strata


can

be

anticipated


by

diligent


measurement


of


the


temperature


and

DO

of


the


various
water

strata.


When

surface


water


is


within

1–2°F

of


the


deeper

strata,


emergency


procedures


should


be

ready
for

implementation


when


the


turnover


occurs.


Conducting

additional


measurements

of


DO

and

temperature


of
the

various


strata


can

prevent


problems

from

occurring.


Emergency

procedures


will


only


have

to


last

for


a

few
hours

until


the


surface


water


oxygen


concentrations


are


increased


by

the


aerators.
Pond

Production
Traditionally,

fish

are


cultured

until


they


attain


an

individual


mean


size


between


3

1/2


to


8

ounces


at


which
time

they


are


sold


for


stocking

at


densities


between


3000


and

4000


per


acre


for


grow

out


to


market

size.
Typical

production

ponds


are


levee


style

and

are


1

to


10

acres


in


size.

Depth

should


not


exceed


5

feet.
Freshwater

is


the


norm,

but


Hybrid


Striped

Bass


can

attain


similar


growth


in


low

-

saline

ponds


up

to


about


5
g/L

(ppt).


Generally,

aeration

is


provided


by

paddlewheel


aerators

at


2

hp

per


acre,


and

dissolved

oxygen


is
maintained

above


4

mg/L


(ppm).
Marketing
Hybrid

Striped

Bass


are


commonly

marketed

live,


whole

on

ice,

or


filleted.


Of

the


Hybrid


Striped

Bass
produced
in


the


United


States,


approximately


81%


is


sold


whole

on

ice,

19%


is


sold


live,


and

0%


is


sold


as
fillets.
Market

price

has

been


relatively


stable

since


1990,


averaging


$2.50–2.75


per


pound.

Market

price

is
based

on

the


size


class


of


the


fish.


Fish


0.75–1.0


pound


are


very


small,


1.0–1.5


pounds


are


small,


1.5–2.0
pounds

are


medium,


2.0–2.5


pounds


are


large,


and

those


greater


than


2.5


pounds


are


very


large.


The


larger
the

size


class,

the


greater


the


value.


Despite


increasing

supply


over


the


past


decades,

market

prices

have
remained
stable.
Whole
on

ice
Many

large


producers


use

this

marketing


method;


fish

are


packaged


into

Styrofoam

boxes

with


ice


or


dry


ice
and
shipped


directly

to


retail


markets

including


seafood

markets

and

restaurants.


This


type


of


marketing


is
usually
arranged


by

a

broker,


who


arranges


sale


and

delivery


of


fish

between


the


producer


and

the


retailers.
The

producer


receives


a

purchase

order


from

the


broker


for


fish

and

then


harvests,

packages,

and

overnight

-
ships

the


Styrofoam

box

to


retail


outlets.


Live
Live
-

hauling


wholesalers
Typically,

live

-

hauling


wholesalers


will


schedule


to


pick


up

fish

and

the


harvest


will


commence


when


the
haulers

arrive


at


the


farm.


Fish


are


harvested,


weighed,


rinsed


if

necessary,


and

immediately


placed


into

live

-
hauling

tanks


with


the


original


culture


water.


Dissolved


oxygen


is


maintained


with


pure


gaseous


oxygen