ac010ill

7/17/2019 ac010ill

http://slidepdf.com/reader/full/ac010ill 1/14

This presentation was produced and is copyrighted by Stewart- Peterson®, Inc. 2003-2005. Permission is

granted or use by acti!e "g#d$et.com® subscribers. "%% other use is prohibited.

ST#&"'T-P#T#'S($ and ")#*$#T.+( are registered trademars o Stewart-Peterson, Inc.

C010 Producing Vs.

Buying quaculture

Seedstock

Aquaculture Library

7/17/2019 ac010ill


Options for groing or

purc!asing seedstock "

1. Using wild seed

• Disease potential

•No genetic control

2. Purchasing seed or fingerlings

• Concentrate on growout

• Avoid breeding/hatching probles

!. "rowing fro start to finish

• #a$iu %ualit& control

• #ore e%uipent' (nowledge and facilities

7/17/2019 ac010ill


#uestions to ask$

• )s there a reliable local source*

• )s the cost reasonable*

• +ow coplicated is the breeding/hatching

process*

• Do ) have the training' e$perience and

one& to breed or hatch stoc(*

7/17/2019 ac010ill


So%e species are al%ost too

easy to reproduce$

• ,ilapia and crawfish are eas& - controllingoverpopulation a& be a proble.

• "rowth a& be stunted if too an& fish• olutions

• Predator fish

• +&brid fish with higher nubers of ale fish• #ale horones at first fr& feeding to induce

se$ reversal

7/17/2019 ac010ill


So%e species are %uc! %ore

difficult to reproduce$

• pecific environental re%uireents• Controlled teperature

• 0ight• alinit&

• Cobination of above

• ach species is different.• pecial (nowledge and e%uipent isre%uired for salon' trout' and o&sters.

7/17/2019 ac010ill


Back to basics it! &'atural

(eproduction) "

• ,he siplest ethod

• ,riggered b& natural seasonal changes

• $aples

• Crawfish in growout ponds

• Catfish and carp given

suitable nests or spawning containers

7/17/2019 ac010ill


A little !elp it! &*odified

'atural (eproduction) "

• oe anipulation to iprove success or toproote outside the natural season

• )proved diet or horones as trigger

• Altering light period• Changing water

teperature

• ggs are usuall&

reoved to hatchingarea with controlledenvironent

Photo courtesy The Catfish Institute.

7/17/2019 ac010ill


+ig!t control it!

&Artificial (eproduction) "

• ,a(es breeding out of the water and into the

laborator&.

• ggs are reoved b& stripping or (illing thefeale.

• #ilt fish sper3 is stripped fro the

ale and i$ed with the eggs.

• 4ertili5ed eggs are incubated

in a controlled setting.

7/17/2019 ac010ill


,andling eggs and ne fry$

• "entle handling needed

• 6ater %ualit& onitoring

• Dissolved o$&gen levels

• 4low rates

• 6ater p+

• +ardness• Al(alinit&

7/17/2019 ac010ill


-eeding t!e fis! "

• Newl& hatched fish feed fro their &ol(

sac endogenous feeding3.

• $ogenous feeding starts when the& feedfro the environent.

7/17/2019 ac010ill


,o %uc! do t!ey eat.

• 4r& fish fro hatching to 173 89:199; of

their bod& weight/da&

• 4ingerlings fro 17 to a &ear3 8:<; ofbod& weight/da&

• "rowing =uveniles 1:!; of weight/da&

• Adults 1; of bod& weight/da&

7/17/2019 ac010ill


/!at do fis! eat in t!e early

stages.

• 4eed si5e starts sall' increasing with fish

si5e

• 4irst foods a& need to be live' notprepared

• +atcher& a& raise feed as well as fr&

7/17/2019 ac010ill


-ry raised in ponds "

• 6ater usuall& coes fro nearb& la(es'rivers and streas containing

• #icroscopic anials 5ooplan(ton3 whichfeed the fr&.

• #icroscopic plants ph&toplan(ton3 whichfeed the 5ooplan(ton.

• #anagers ust aintain stablepopulations of 5ooplan(ton andph&toplan(ton b& fertili5ing with

phosphorus and nitrogen.

7/17/2019 ac010ill


This presentation was produced and is copyrighted by Stewart- Peterson®, Inc. 2003-2005. Permission is

granted or use by acti!e "g#d$et.com® subscribers. "%% other use is prohibited.

ST#&"'T-P#T#'S($ and ")#*$#T +( are registered trademars o Stewart-Peterson Inc

www.agednet.com

800-236-7862

Documents

ac010ill