Fish Reproduction

External fertilization

This is the ancestral condition in fish reproduction.

Andromous

This is when a fish lives in oceans, but migrates to freshwater to spawn.

Semelparous

This is when an organism reproduces once, and then dies.

Catadromous

This is when a fish lives in freshwater but migrates to oceans to spawn.

Clasper

This is an intromittent organ for sperm transfer.

Iteroperous

This is when an organism reproduces multiple times throughout its life.

Internal

_____________________ fertilization is universal in Chondrichthyes.

Grunion

This is terrestrial spawning.

Oviparity

This is the term for “egg-laying”

Viviparity

This is the term for “live birth”

Lecithotrophy

This is when the yolk supplies nourishment for the embryo.

Matrotrophy

This is when the reproductive tract provides nourishment for the embryo.

internal

Viviparity requires _________________ fertilization.

oviparous

Some sharks and all skates are _________________.

viviparous

Some sharks and all rays are __________________.

oviparity

The predominant reproductive mode for Osteichthyes is _____________________.

Gonochorism

This is when sex is fixed throughout life.

Hermaphroditism

This is when male and female gonads are present in the same individual.

Protandry

This is when an organism starts as male, and then changes to female.

Size-Advantage Hypothesis

This is the hypothesis that large females produce many eggs; even small males can make enough sperm.

Protogyny

This is when an organism starts as female, and changes to male.

largest

In both protandry and protogyny, the next _____________ individual will change into the sex that benefits from size.