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

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Presentation on theme: "Broodstock Acquisition/Conditioning Dr. Craig S. Kasper FAS 2263."— Presentation transcript:

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

2 Summary Broodstock Facilities (review)Broodstock Facilities (review) Broodfish Stocks SelectionBroodfish Stocks Selection Broodfish QualityBroodfish Quality Broodfish Conditioning (Nutrition)Broodfish Conditioning (Nutrition) Broodfish CareBroodfish Care Financial ConcernsFinancial Concerns

3 Broodstock: The Goal Production of good quality eggs is dependent upon the quality of the broodstock.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.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.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.Hiring a consulting firm could be an expensive process, so choose wisely. Consulting experts will often save you costly mistakes…Consulting experts will often save you costly mistakes…

6 LIKE OVER-ENGINEERING YOUR FACILITY!!

7 Broodfish Stock Aquisition You’ve decided toYou’ve decided to breed fish, good! breed fish, good! Where do I get ‘em?Where do I get ‘em?

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

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

10 Sometimes it’s a little challenging!

11 Established private producers are a source! Established private producers are a source! The advertising is good, too! 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.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!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 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 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.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.)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.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.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 byOmni’s and herb’s can get by on less protein. on less protein.

17 Broodstock: Precautions Multiple spawnings possible! (Tropicals, BG’s) Multiple spawnings possible! (Tropicals, BG’s) Initially, females and males are preferably kept in separate broodstock areas.Initially, females and males are preferably kept in separate broodstock areas. Two sets of ponds: ripening males and females vs. spent spawners.Two sets of ponds: ripening males and females vs. spent spawners. Prevents wild spawning, enables feeding of conditioning diet to females, lowers stocking density.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.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.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...)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.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).♀- well-rounded and soft or semi-soft belly; erect, reddish genital papilla (anal opening is enlarged and protruding). ♂ -slight abdominal pressure releases milt♂ -slight abdominal pressure releases milt Other signs include: presence ofOther signs include: presence of an ovipositor, or a an ovipositor, or a gonadopodium (gonopodium). gonadopodium (gonopodium).

20 Final Selection Select breeders one by one!Select breeders one by one! 1.Mature breeders = hatchery 2.Immature breeders = pond 3.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.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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