Systemic Pathology of Digestive System of Fish
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Transcript of Systemic Pathology of Digestive System of Fish
SYSTEMIC PATHOLOGY OF DIGESTIVE SYSTEM OF FISH
Md.Atick Chowdhury
Systemic Pathology of TeleostThe Integumentary SystemThe Respiratory SystemThe Digestive SystemThe excretory System
The Digestive SystemDigestion is the process of converting food
into smaller compounds that can be used by the body.
Mouth Buccal Cavity Phyrynx Oesophagus Stomach Pyloric caeca Intestine The Pancreas Liver Rectum Anus
The Digestive System
Figure: Teleost Digestive System
Oral Cavity The oral cavity of the teleost is a hard, bony
structure, which is well adopted to prehension of rough materials.
Common Diseases:Lesions:
Caused by fishing hook & developed into infected ulcers.
Necrotic fungal infection: Occur in upper jaw.
Neoplasia: Lesion of the lips or of pharynx. Caused by polluted water.
Oral Cavity
Figure: Normal Structure of Oral Cavity
Figure: Pathology of Oral Cavity
OesophagusOeosophage is situated after pharynx, a
muscular tube that leads to the stomach.Common Diseases:
Degenerative myopathy:o Develop in muscle of oesophagus.o Occurs due to vitamin E.
Figure: Normal Structure of Oesophagus
Figure: Pathology of Oesophagus
Swim Bladder A gas-filled structure in many fishes that
functions to maintain buoyancy & helps in respiration.
Common Diseases: Oedema:
Caused by chronic bacterial infection. Inflammation:
Due to raise of temperature. Distension:
Assosiated with pathological lesions. Due to feeding on dusty food.
Swim Bladder
Figure: Normal Structure of Swim Bladder
Figure: Pathology of Swim Bladder (1: Inflammation, 2: Distention, 3: Oedema)
1
2 3
The StomachAfter oesophagus true stomach is found.Common diseases:
Bacterial lesions: Occurs occasionally within the muscular is of the
stomach and external serous.Ascites:
Increased fluid found in stomach cavity.
The Stomach
Figure: Normal Structure of Stomach
Figure: Pathology of Stomach
The IntestineThe intestine is a long thin tube with a thin
double layer musculature.Common diseases:
IPN (Infectious Pancreatic Necrosis): Infectious Pancreatic Necrosis Virus Does not take food Fish show abnormal distension
IHN (Infectious Haematopoietic Necrosis): Infectious Hematopoietic Necrosis Virus (IHNV)
CCVD (Channel Catfish Viral Disease): Channel Catfish Virus (CCV) Abnormal movement Swelling
The IntestineVHS (Viral Hemorrhage Septicemia):
VHSV (Viral Hemorrhage Septicemia Virus) Dark color on intestine skin Swollen structure
Chronic infection: Caused by fungus such as Mycrobacterium or
Nacardia asteroides. Focal granullomatous infecton of the gut wall
The Intestine
Figure: Normal Structure of Intestine
Figure: Pathology of Intestine
Liver It has no specific shape and has 2 or 3 tissues. Common diseases:
Hepatic Necrosis: Diphyllobothrium sp., Aeromonas salmonicida Nausea, weakness, abdominal pain.
Lipid infiltration: Fatty infiltration of liver cell is common in farmed
fishes. Liver enlarges Yellow or light brown color Loses its sharp edge of its lobes.
Hepatic granuloma: Caused by a wide range of pathogen. Renibacterium salmoninarum, Mycobacterium
fortuitum.
Liver Euclinostomum:
Caused by Digenean parasites. Blood vessel degeneration:
Blood vessel degenerates rapidly. Vaccume:
Cell reduced causing vaccume condition. Bacterial colony:
Several bacteria attacks & forms colony.
Liver Pigment accumulation:
Most common is accumulation of ceroid and lipofuscin
These byproduct catabolism are seen in liver cells & hemopoietic tissue.
The biliary system: It includes gallbladder, bile ducts and certain cells
inside the liver & bile duct outside the liver. Protozoan parasites are frequently observed in the
gallbladder. Pathological changes resulting from biliary disease
depend on the level of the lesion.
Liver
Figure: Normal Structure of Liver
Figure: Pathology of Liver
Figure: Digenean sp.
PancreasPathology of the teleost pancreas is complex.
Pancreatic tissue located in externa around the portal vein system within the liver.
Common diseases:IPN (Infectious Pancreatic Necrosis):
Infectious Pancreatic Necrosis Virus Responsible for acute & chronic exocrine
pancreatitis. Affected fish have massive necrosis of the pancreas
and mortalities can be 20-30%CCVD (Channel Catfish Viral Disease):
Channel Catfish Virus (CCV)IHN (Infectious Haematopoietic Necrosis):
Infectious Haemopoietic Necrosis Virus
Pancreas
Figure: Normal Structure of Pacreas
Figure: Pathology of Pancreas
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