Pomadasys Magranthans

Carlos Garcia

Sebastian Lopez

Pomadasys Magranthans

• Is a common bony fish found in coastal waters in or near reefs or on soft substrates; they are found in sub-tropical and tropical waters.

• The skin of this fish is divided into two layers. – The epidermis which is the outer layer.– And the dermis which is the inner layer.

External anatomy

• The fish has a bilateral symmetry.

• The external body features of this fish are divided into two regions, the head region and the trunk region

Dissection

• The first step we took when performing the dissection is to remove the scales so you are left with bare skin, which is softer. We cut the unbroken lateral line that extends from the anterior or rostral region to the caudal fin.

Dissection cont.

• The second step is to perform cuts in the head region

• We cut downward between the nostrils to the base of the eye.

• The second cut is a straight line parallel to the Preopercle all the way to the jaw

Systems of the internal anatomy

• There are 6 systems within the Pomadasys magranthans

• Circulatory- Takes blood throughout the body.– The organs used by this system are the heart,

gills, lamella, the latter is the gas exchange site.

Systems cont.

• Respiratory- is the system were the gas exchange occurs and oxygen is introduced into the blood. – The fish’s respiratory system works like this:

• Water is taken through the fish’s mouth• The water passes through the gill fillaments where

oxygen is taken from the water.• As blood pases through these gill fillaments it

absorbs the oxygen taken from the water.

Systems cont.

• Digestive system- This system breaks down food.– The food that the fish eats is further digested

in a sack like organ called the pyloric caeca.

Systems cont.

• Excretory system- Excretory system controls the production of waste products – In the perch fish ammonia is the mayor waste

products; it is derived from amino acids and proteins broken down inside the perch.

Systems cont.

• Nervous system- The Central Nervous system is mainly, almost completely found in the brain and is in charge of controling bodily functions as well as sensors throughout the body– Fish have especially developed sensors like

the lateral line which allow it to “hear” sound vibrations in the water.

Systems cont.

• Reproductive system- This system is in charge of reproduction. – Males reproductive system- testes– Female reproductive system- ovaries.