Download - Fish reproduction razia
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General Concepts in Fish General Concepts in Fish ReproductionReproduction
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General ConsiderationsGeneral Considerations
• Natural habitat of speciesNatural habitat of species
• Body size and first parityBody size and first parity
• Annual vs. multiple spawningAnnual vs. multiple spawning
• Eggs are hardest to produceEggs are hardest to produce
• Hormone treatmentsHormone treatments
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Reproductive StrategiesReproductive Strategies
• Maximize survival of eggs and fryMaximize survival of eggs and fry– natural habitat vs. man-madenatural habitat vs. man-made
• Ultimate FactorsUltimate Factors– food supplyfood supply– absence of predatorsabsence of predators– water qualitywater quality
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Reproductive StrategiesReproductive Strategies
• Ultimate FactorsUltimate Factors
• Proximate Factors Proximate Factors – environmental cuesenvironmental cues– anticipate future spawninganticipate future spawning
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Day Length and Day Length and TemperatureTemperature
-5
0
5
10
15
20
25
Water Temperature (C)
Day Length (h)
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Reproductive StrategiesReproductive Strategies
• Synchronous Synchronous – All eggs are spawned and the fish diesAll eggs are spawned and the fish dies
(What fish have we seen that fits this?)(What fish have we seen that fits this?)
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Reproductive StrategiesReproductive Strategies
• Synchronous Synchronous – All eggs are spawned and the fish diesAll eggs are spawned and the fish dies
• Group Synchronous Group Synchronous – Multiple spawning and seasonal spawnersMultiple spawning and seasonal spawners
(Any examples?)(Any examples?)
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Reproductive StrategiesReproductive Strategies
• Synchronous Synchronous – All eggs are spawned and the fish diesAll eggs are spawned and the fish dies
• Group Synchronous Group Synchronous – Multiple spawning and seasonal spawnersMultiple spawning and seasonal spawners
• AsynchronousAsynchronous– Multiple and daily spawningMultiple and daily spawning– All oocyte development stages presentAll oocyte development stages present
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Stages of ReproductionStages of Reproduction
• Stage 1Stage 1 Oocyte developmentOocyte development– Gonadotropin independentGonadotropin independent– Body size dependentBody size dependent
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Stages of ReproductionStages of Reproduction
• Stage 1Stage 1 Oocyte developmentOocyte development
• Stage 2Stage 2 VitellogenesisVitellogenesis– Egg yolk productionEgg yolk production– High nutritional demandHigh nutritional demand– Longest phaseLongest phase
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Stages of ReproductionStages of Reproduction
• Stage 1Stage 1 Oocyte developmentOocyte development
• Stage 2Stage 2 VitellogenesisVitellogenesis
• Stage 3Stage 3 Oocyte maturationOocyte maturation– Germinal vesicle migrationGerminal vesicle migration– Resumption of meiosisResumption of meiosis– Water uptakeWater uptake
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Stages of ReproductionStages of Reproduction
• Stage 1Stage 1 Oocyte developmentOocyte development
• Stage 2Stage 2 VitellogenesisVitellogenesis
• Stage 3Stage 3 Oocyte maturationOocyte maturation
• Stage 4Stage 4 SpawningSpawning– Optimum environmentOptimum environment– Mating behaviorsMating behaviors
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Stages of ReproductionStages of Reproduction
• Stage 1Stage 1 Oocyte developmentOocyte development
• Stage 2Stage 2 VitellogenesisVitellogenesis
• Stage 3Stage 3 Oocyte maturationOocyte maturation
• Stage 4Stage 4 SpawningSpawning
• Stage 5Stage 5 RecoveryRecovery– Restore body conditionRestore body condition– New oocyte developmentNew oocyte development
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Stages of ReproductionStages of Reproduction
• Stage 1Stage 1 Oocyte developmentOocyte development
• Stage 2Stage 2 VitellogenesisVitellogenesis
• Stage 3Stage 3 Oocyte maturationOocyte maturation
• Stage 4Stage 4 SpawningSpawning
• Stage 5Stage 5 RecoveryRecovery
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SpawningSpawning
• Release of eggs and miltRelease of eggs and milt– FertilizationFertilization
• Simulate natural environmentSimulate natural environment
• Dry strippingDry stripping
• Hormone inductionHormone induction
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SpawningSpawning
• Simulate natural environmentSimulate natural environment– Milk cansMilk cans– Ammo boxesAmmo boxes– Floating nestsFloating nests– Fiber matsFiber mats
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SpawningSpawning
• Dry StrippingDry Stripping– Express eggs and miltExpress eggs and milt– Mix togetherMix together– Add waterAdd water
• Activate eggs and miltActivate eggs and milt closure of micropyleclosure of micropyle
– SiltingSilting
MS222 is toxic to eggs and milt!MS222 is toxic to eggs and milt!
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SpawningSpawning
• Induced SpawningInduced Spawning– Stage 3 Oocyte maturationStage 3 Oocyte maturation– Egg SamplingEgg Sampling
• Egg sizeEgg size• Yolk clarityYolk clarity• Oil globulesOil globules
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SpawningSpawning
• Hormone InjectionHormone Injection– Carp Pituitary ExtractCarp Pituitary Extract– Human Chorionic GonadotropinHuman Chorionic Gonadotropin
• Single or multiple injectionSingle or multiple injection– Stage 3 complete in 12 - 48 hStage 3 complete in 12 - 48 h
• Natural Environment or Dry StrippingNatural Environment or Dry Stripping
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ConclusionsConclusions
• Reproductive strategies are variableReproductive strategies are variable
• Aquaculturist provides proximate and Aquaculturist provides proximate and ultimate factorsultimate factors
• Early stages critical for egg viabilityEarly stages critical for egg viability
• Hormone treatments induce egg Hormone treatments induce egg maturationmaturation