Tank
Production
Flow-
through


tank


systems
Flow-
through


tank


systems


can

be

used

to


produce

Hybrid


Striped
Bass

of


all


sizes.

The


tanks


can

be

either


flow

-

through,


single-

pass
systems,

or


they


can

recirculation


water


through


bio

-

filters


and

various


other


components


to


remove


waste
from
the


water.


Flow-

through


tank


systems

are


used

by

several


producers


of


Hybrid


Striped

Bass


in


Florida.
These

tanks


vary


from

rectangular


raceway


tanks


to


round

tanks


of


various


sizes.
Some
producers


use

the


discharged


water


for


additional


purposes,


for


instance,


to


culture


other


species


of
fish
or


to


water


traditional


agriculture

plants.


Some

producers


recirculation


water


through


a

series

of


large
ponds

and

reuse


the


water


by

passing


it

through


a

production

tank


and

then


removing

waste

products


by
passage

through


wetlands


and/or


settlement


ponds.


This


method


allows


the


water


to


be

cleaned


of
nitrogenous

and

particulate

wastes

before


being


passed


through


the


production

tanks


again.


This


reduces
water

discharge


versus


a

single-

pass,


flow

-

through


type


of


system.


In


Florida,


producers


must


obtain


permits
for

water


usage


from

the


regional

water


management


district


(http://www.dep.state.fl.us/secretary/watman/)
and
water


discharge


is


regulated

by

the


Florida

Department


of


Agriculture


and

Consumer

Services


Division


of
Aquaculture.
For

further


information,


consult


the


Aquaculture


Best


Management


Practices

Rule

(FDACS
2007).
Flow
-

through


tank

production

facilities

in


Florida

commonly

stock


10

g

fish

at


a

density

of


0.33


fish

per


gallon
(1.25

fish/L)


in


raceways


and

0.5


fish

per


gallon

(1.9


fish/L)


in


round

tanks.


Time


to


market

size


of


1.75


pounds
(795

g)


is


14

months


in


raceways


and

12

months


in


round

tanks.


Survival

typically

exceeds


80%.
Recirculating

aquaculture

tank

systems


(RAS)


can

be

used

to


produce

Hybrid


Striped

Bass


of


all


sizes.
Without

going


into

much


detail


in


this

document,


typical


components


to


a

recirculating


aquaculture


tank
system
are


the


tank


to


hold


the


fish,


a

biological


filter


to


remove


nitrogenous


waste,


various


components


to
remove

large


particulate

waste,


and

foam

fractionators


to


remove


micro

-

particulate

waste.


Additionally,
aeration,

lighting,


and

temperature


control


are


provided

.
RAS
production

commonly

reaches

0.33

-

0.5


pounds/gallon


(0.04

-

0.059


kg/L)


of


water.


If

a

100

g

fish

is
stocked,

after


5–7

months


of


grow

out


the


fish

will


weigh

1.25–2.0


pounds


(681–908


g)


each.


Feeding

Hybrid
Striped
Bass


requires

changing

particle


size


and

composition


of


their


diet


as

the


fish

grow.


Phase


III


fish

are
fed

1/4


to


3/8


inch


particles


of


40–45%

protein.


Managing


the


amount


of


feed


provided


is


critical


for


the
financial

success

of


an

aquaculture


operation.


Periodically

measuring

growth


will


help


determine


if

the


amount
fed

is


sufficient.


At


harvest,

feed


conversion


ratios


(amount


fed


/


amount


gained)


can

be

calculated


if

the
amount

of


feed


supplied


has

been


recorded.
Water

quality
Water

quality


is


critical


for


all


production

systems

because


it

determines


the


survival,


health,


and

growth


of


the