Term
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Definition
| germ cells, gametes; somatic cells; gonoducts (duct of gonad) |
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Term
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Definition
| nourish, physically support, refulate development of germ cells |
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Term
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Definition
| gametes as primordial germ cells -> sperm (spermatogonia, internal stages, 4 spermatozoa) -> eggs (oogonia, surrounded by follicle, invested w/ yolk, ovulation, freed from follicle, hydration. One egg per oogonium) |
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Term
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Definition
| spermatogonia -> other internal stages -> produce 4 spermatozoa |
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Term
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Definition
| oogonia -> surrounded by follicle -> invested w/ yolk -> ovulation -> freed from follicle -> hydration. One egg per oogonium |
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Term
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Definition
| less time and energy in courtship, pair bonding; increases number of potential mates; greater fecundity; no or little selectivity. Mose used. |
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Term
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Definition
| iteroparous (spawn more than once); lower fecundity; more time, energy and risk; courtship, bonding, etc; mate selectivity (quality); in few groups: sharks, rays, skates, ratfish(chondrichtheys); guppies, mollies (poeciliidae, goodeidae); surfperch (embiotocidae) |
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Term
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Definition
| hard to tell male from female; sex may be indicated by color(courtship, territoriality); structures that function in mating(breeding tubercles) or sperm delivery(intromittent organs) |
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Term
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Definition
| germ cell -> oogonia -> primary oocyte -> secondary oocyte -> vitellogenesis -> ovum (ripe egg) |
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Term
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Definition
| most fishes breed more than once in lifetime; some seasonally over several yrs; some at regular intervals during a season w/in a yr |
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Term
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Definition
| some fishes spawn once during lifetime; many diadromous(anadromous and catadromous fishes spawn once after long, energy consuming migration); anguillidae, salmonidae, clupidae; all energy into eggs and migration |
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Term
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Definition
| spermatogonium (daughter cell spermatogonium remains as precursor stem cell; dautercell spermatogonium pushed away from basement membrane)-> differentiates into primary speratocyte(dna replication, tetrad formation and crossing-over)-> meiosis I to secondary spermatocytes(each chromosome has 2 chromatids)-> meiosis II to spermatids (w/ cytoplasmic bridge)-> spermiogenesis to 4 spermatozoa |
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Term
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Definition
| ovary -> ostium -> oviduct -> shell gland -> uterus or cloaca |
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Term
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Definition
| testes -> anterior kidney(leydigs gland) -> seminal vesicle -> cloaca -> claspers |
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Term
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Definition
| intromittant organ; modified pelvic fin of Chondrichthyes |
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Term
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Definition
| Intromittant organ; modified anal fin of Poecilidae |
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Term
| Oocyte recruitment: synchronous |
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Definition
| all oocytes develop at same time and ovulate at same time(semelparous) |
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Term
| Oocyte recruitment: group synchronous |
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Definition
| vitellogenic oocytes divided into groups, ovulate over course of a breeding season. reach maturity and spawn at diff times |
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Term
| Oocyte recruitment: asynchronous |
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Definition
| oocytes at all developmental stages present in ovary; unorganized; release few eggs here and there |
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