Dissection of a Sea Bass

Yee Jek Hui, Darryl (33)

1P1

Parts of the Sea Bass

The Sea Bass

The sea bass is white at the bottom, turning to a dark bluish silver at the top. The head and fins are darker than the rest of the body.

The Outside of a Sea Bass

Pectoral Fin: Locomotion and side to side movement

Pectoral fin

Pelvic finAnal fin

Caudal (tail) fin

Caudal peduncle

Soft dorsal fin

Spiny dorsal fin

The Outside of a Sea Bass

Pelvic Fin: Move the fish up and down

Pectoral fin

Pelvic finAnal fin

Caudal (tail) fin

Caudal peduncle

Soft dorsal fin

Spiny dorsal fin

The Outside of a Sea Bass

Dorsal Fin: Lends stability in swimming

Pectoral fin

Pelvic finAnal fin

Caudal (tail) fin

Caudal peduncle

Soft dorsal fin

Spiny dorsal fin

The Outside of a Sea Bass

Caudal Fin: To propel the fish forward

Pectoral fin

Pelvic finAnal fin

Caudal (tail) fin

Caudal peduncle

Soft dorsal fin

Spiny dorsal fin

The Outside of a Sea Bass

Anal Fin: Like the dorsal fin, it also lends stability in swimming

Pectoral fin

Pelvic finAnal fin

Caudal (tail) fin

Caudal peduncle

Soft dorsal fin

Spiny dorsal fin

Gills of a Fish

Gills allow fishes to breathe underwater. They consist of gill filaments, gill arches and gill rakers.

Gills of a Sea Bass

• Gill Filaments: Large surface area to maximise the amount of oxygen absorbed.

Gill arches

Gill rakers

Gill filaments

Gills of a Sea Bass

• Gill Arches: Provide support for the gills and their associated blood vessels

Gill arches

Gill rakers

Gill filaments

Gills of a Sea Bass

Gill Rakers: Bony, finger-like projections off the gill arch which function in filter-feeders in retaining food organisms

Gill arches

Gill rakers

Gill filaments

Internal Anatomy of a Sea Bass

Heart: Circulates blood throughout the body. The blood transports waste products from the cells to the kidneys and liver for elimination.

HeartPyloric caeca

Internal Anatomy of a Sea Bass

Plyoric Caeca: Secrete enzymes that aid in digestion, may function to absorb digested food

HeartPyloric caeca

Internal Anatomy of a Sea Bass

Muscles: Provide movement and locomotion

Swim bladder Muscles

Vent

Internal Anatomy of a Sea Bass

Vent: The site of waste elimination from the fish's body

Swim bladder Muscles

Vent

Internal Anatomy of a Sea Bass

Swim Bladder: A hollow, gas-filled balance organ that allows a fish to conserve energy by maintaining neutral buoyancy in water.

Swim bladder Muscles

Vent

Internal Anatomy of a Sea Bass

Liver: It assists in digestion by secreting enzymes that break down fats, and also serves as a storage area for fats and carbohydrates. The liver also is important in the destruction of old blood cells and in maintaining proper blood chemistry, as well as playing a role in nitrogen (waste) excretion.

Kidney

Stomach

Liver Intestines

Internal Anatomy of a Sea Bass

Stomach & Intestines: Break down and digest food as well as absorb nutrients. 

Kidney

Stomach

Liver Intestines

Internal Anatomy of a Sea Bass

Kidney: Filters liquid waste materials from the blood. It also

regulates water and salt concentrations within the fish's body, allowing certain fish species to exist in freshwater or saltwater

Kidney

Stomach

Liver Intestines

References

1. Badman’s Tropical Fish. (2010). Fish Anatomy [on-line]. Available: http://badmanstropicalfish.com/anatomy.html

2. Island Fishkeepers. (2008). Fish Anatomy [on-line]. Available: http://www.iowas.co.uk/fish%20anatomy.html

3. Australian Museum. (2010). Dissection of a Blue Mackerel, Scomber australasicus [on-line]. Available: http://australianmuseum.net.au/Dissection-of-a-Blue-Mackerel-Scomber-australasicus

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