perch anatomy lab

What group do perch belong in?

fish

What are the characteristics of a fish?

ectotheric; use gills; have fins and scales; posses swim bladder

The two different dorsal fins are the _______ and ________. The first dorsal fin is characterized by having _________ fins.

first and second; sharp

What is the purpose of the operculum?

helps pump water over gills for respiration

The heart has ____ chambers. It is a __________ circulatory system because blood flows to and from the heart in a ___________. This is different from other non-fish vertebrates because __________________.

2; single loop; single pathway; two separate pathways

Water moves across the gills in an opposite direction from the flow of blood, which is defined as ________________.

Countercurrent flow

How does the swim bladder help the perch maintain buoyancy?

adjusting the amount of oxygen intake

Caudal fin - External

propels forward

First dorsal fin - External

protection and balance

Second dorsal fin - External

balance

Pelvic fin - External

provide balance and up-and-down movement

Anal fin - External

stability

operculum (external)

protects gills; pumps water to gills for respiration

Pectoral fin - External

steer and control the depth

Anus - External

exit for digestive tract and opening for sex

Liver - Internal

regulating glucose levels and aid digestion

Heart - Internal

single blood flow from and to heart in single pathway

Stomach - Internal

breaks down food and absorbs nutrients

Intestine - Internal

final digestion place; absorbs nutrients from food

Gills - Internal

breathe underwater via gas exchange

Swim bladders - Internal

maintain bouyance by adjusting amount of o2

Gonad

sex organs