Marine Vert-- ppt 4 (Gonads/Reproductive)

Dioecious

two separate sexes

Hermaphrodites

individuals change from one sex to another

What are a couple ways that fish can reproduce?

-asexually

-broadcast

-benthic

-prolonged gestation

Gymnovarian

eggs shed into body cavity from ovaires, enter oviduct via “funnel”

What species have the gynmovarian type?

-Chondrichthyes

-lungfish

-sturgeon

-bowfish

what are the two ovary types?

Gynmovarian and Cystovarian

Cystovarian

lumen of ovary is continuous with oviduct

What species have the cystovarian type?

teleosts

What are the different variations of reproductive systems?

-Ovuliparous

-Oviparous

-Ovoviviparous

-Viviparous

How does the ovuliparous reproductive system work? Who uses it?

-external fertilization

-zygotes develop externally

-most fish

How does the oviparous reproductive system work? Who uses it?

-internal fertilization

-zygote develops externally

-also most fishes ?

How does the ovovivparous reproductive system work? Who uses it?

-external fertilization

-zygotes develop internally

-yolk is primary nutritive source

-many sharks, coelacanth, rockfishes, guppies

How does the viviparous reproductive system work? Who uses it?

-zygote develops internally

-nutrition via placenta, material secretion, oophagy, consuming siblings

-some sharks, surf perches