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8 Cards in this Set
- Front
- Back
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what does induced spawing provide the means for?
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produce hybrids by inducing spawing outside normal season
lengthen production/grown out cycles maximize fertilization and larval survival due to optimization of conditions |
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what are the advantages of controlled spawning?
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reduceds pre-spawing mortality
improves production efficiency (labor) frees time for other operational chores |
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what are the environmental approaches to induced spawning?
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temperature, photoperiod, lunar cycle, vegetation/food, other species, substrate/nesting materials, salinity, pheromones, social cueing, ect.
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what are the approaches to induced hormonal spawning?
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hypophysectomy, GTH/partially purified gonadotropins/human chorionic gonadotropin (HCG), LH-RH/Gn-RH
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what are the delivery methods for drugs?
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injections (1-100 mg kg-1 LH-RH), sustained release devices (5mg in 95 mg Cholestrerol), oral delivery (variable -add with antacids, anto-enzymes, ect.
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what is the endocrine control of reproduction?
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anti-estrogens, dopamine agonists hypothalamus-GnRH-Pituitary-GTH-ovary-vitellogenesis-final oocyte maturation-hydration and ovulation-spwaning behavior
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what are the spawning procedures?
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depends upon species under consideration (stress, size, value),
ovarian maturation and egg development staged method employed to induce spawning selected based upon above |
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describe salmon spawning
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grade/separate by sex
check ripeness treat/prime anaesthetize and strip check milt viability add eggs to mit/mix water harden (1h) micropyle closure wash eggs incubation remove dead eggs |
