Digestion System of Fish

Digestion System of Fish

General

Digestion tracks

1. Mouth
2. Buccal cavity
3. Pharynx
4. Oesophagus
5. Stomach
6. Intestine
7. Anus
8. Cloaca

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Sharks

reference:The Shark Digestive System

Digestive Tracks

1. Mouth
   Grain Foods
   Lack of salivary amylase
2. Esophagus
3. Stomach
4. Spiral Intestine (small intestine)
   The place absorption and nutrients and toxins take palce

• Duodenum (the first part of the spiral intestine)

• pyloric sphincter/ pylorus (First part of Duodenum)
  The muscle expands and contrast to control the food into the duodenum
  (Spiral valve in the inside of intestine)

5. Colon (an enlarged Intestine)

• water absorption

6. Rectum and Cloaca (the waste expelled)

Digestive Organ

Liver

• detoxification (hepatic portal system)

• HPS: gathering the blood from the GI track and taking it back to the liver to be detox.

• storage Clucose
• produces vile
• Squalene (Shark)
  It allows buoyancy because the oil is lighter than water
• bile (looks like green blister)
  stores at gallbladder

Spleen

Produces, stores, and breaks down blood cells
** Major Part of Immune system** for shark(fish)

Pancreas

• exocrine function: Pancreatic juices.
• endocrine function: regulating blood sugar (insulin).

Rectal Gland

salt gland: salty homeostasis

Digestive System and Physiology of Digestion in Fishes

reference:Video

Pancrease

1. exocrine secretion into Intestine
2. Endocrine secretion of the hormones insulin and glucagon

Liver

1. Priduce bile
2. synthesis and stores glycogen

Other Glands

1. Mucosal & sybmucosal lining of the fish contain some glands
2. Glandular structure of stomach comprises the gastric glands in the cardiac and the pyloric regions

Gastric Phase of Digestion

Pepesin

predominant gastric enzyme

Trypsin

Carbohydrases

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Reference:

Fish digestive system| scoliodon digestive system