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Broodstock Acquisition/Conditioning

Broodstock Acquisition/Conditioning. Dr. Craig S. Kasper FAS 2263. Summary. Broodstock Facilities (review) Broodfish Stocks Selection Broodfish Quality Broodfish Conditioning (Nutrition) Broodfish Care Financial Concerns. Broodstock: The Goal.

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Broodstock Acquisition/Conditioning

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  1. Broodstock Acquisition/Conditioning Dr. Craig S. Kasper FAS 2263

  2. Summary • Broodstock Facilities (review) • Broodfish Stocks Selection • Broodfish Quality • Broodfish Conditioning (Nutrition) • Broodfish Care • Financial Concerns

  3. Broodstock: The Goal • Production of good quality eggs is dependent upon the quality of the broodstock. • For that reason, maintaining a healthy, non-stress and disease free environment for broodstock is critical to a successful operation.

  4. This is what you want!!

  5. Broodstock Holding Facilities • Always work closely with experts to design and manufacture a broodstock system that meets your unique needs while assuring a top quality growing environment, up to date bio-security and 'best of' monitoring and controls. • Hiring a consulting firm could be an expensive process, so choose wisely. • Consulting experts will often save you costly mistakes…

  6. PRESSURIZEDSAND FILTERS(PSF) 1mm WELLSCREEN MAIN SWPUMPS (2) FRESHWATER OCEAN BRINETANKS LARVALMODULERESERVOIRS MATURATIONMODULERESERVOIRS OVERFLOW TO RESERVOIR BLOWER OVERFLOW PUMPS EFFLUENTTREATMENT PSF MATURATIONMODULECULTURETANKS COMPRESSOR 5 MICRONFILTERS OZONEUNIT HEATEXCH. 1 MICRONFILTERS UV MAIN DRAINLINE DE-GASSTORAGERESERVOIR OZONECONTACTCOLUMNS HEATEXCH. UV OZONEUNIT LARVALMODULECULTURETANKS COMPRESSOR OVERFLOW TO RESERVOIR BLOWER SEAWATER TREATMENT SCHEMATIC LIKE OVER-ENGINEERING YOUR FACILITY!!

  7. BroodfishStock Aquisition • You’ve decided to breed fish, good! • Where do I get ‘em?

  8. Broodfish Stocks • Local state agencies might be a source. They “turn over” fish after several spawning cycles. • While not the very best, they might be free! • This could be critical if you are strapped for cash or don’t want to shell out the dough for fish with which you have little experience.

  9. You might be able to get them yourself! • Check with local department of natural resources • concerning collection permits. Atlantic Salmon stock enhancement - collection of wild broodstock Yeah, but who wants to sort all those fish??

  10. Sometimes it’s a little challenging!

  11. Established private producers are a source! • The advertising is good, too!

  12. Broodstock Acquisition (cont.) • Established research programs will sometimes trade them, or even give them away when research is finished. • Don’t count this being an easy sale though. Remember, these fish are time and money to people! REM: Tax dollars!

  13. Hey, would you GIVE these away?!?

  14. Broodstock Selection • The selection of fish with desirable hereditary qualities typical of improved strains such as rapid growth potential, tolerance to poor water quality, strong appetite, omnivorous feeding regime. • The selection of fish with well-developed sexual organs! • The rearing of these selected fish to produce healthy potential spawners, with dormant eggs well developed in the females.

  15. Future Breeders “A”-List (1) good overall health (2) no lesions (body wounds) (3) no parasites (4) typical scale distribution (5) no fin/body deformation (6) optimal shape/proportions (7) not too fat (8) not too thin

  16. Broodstock Nutrition • After stripping (when the breeders are stressed and before new eggs are formed) they need as much protein as they can get, or as you can afford. (OTC on hand can’t hurt.) • This helps fish repare tissues and ward off diseases. • During egg development and when the breeders await spawning; tropicals, carnivors and marine fish diets >40% protein content are used. • Omni’s and herb’s can get by on less protein.

  17. Broodstock: Precautions • Multiple spawnings possible! (Tropicals, BG’s) • Initially, females and males are preferably kept in separate broodstock areas. • Two sets of ponds: ripening males and females vs. spent spawners. • Prevents wild spawning, enables feeding of conditioning diet to females, lowers stocking density.

  18. Polyculture within broodstock ponds? • Yes! Sometimes using a few smaller (100-200 g) carnivorous fish is advisable. • About 200-400 ind/ha (80/100 fish/acre) controls emigrants which compete for food with the broodstock. • Similarly, these carnivorous fish will eliminate the juveniles born from accidental wild spawning (yes, that was a male fish you missed...) • Of course, if you’ve stocked carivorous fish, this is a mute point.

  19. What are the external signs of the breeder's maturity? • ♀- well-rounded and soft or semi-soft belly; erect, reddish genital papilla (anal opening is enlarged and protruding). • ♂ -slight abdominal pressure releases milt • Other signs include: presence of an ovipositor, or a gonadopodium (gonopodium).

  20. Final Selection • Select breeders one by one! • Mature breeders = hatchery • Immature breeders = pond • Unhealthy or invalid fish = sold (eat?) • This selection process is especially important for the females, whose maturity should be thoroughly checked, to ensure the success of the artificial propagation.

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