parasitology protozoan – metazoan – host-parasite relationships –
TRANSCRIPT
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PARASITOLOGY • PROTOZOAN
–
• METAZOAN–
• HOST-PARASITE RELATIONSHIPS – –
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PARASITOLOGY
• Parasites as vectors for disease– – –
• PARASITES as portals of entry– –
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HEAVY INFESTATIONS• SUBLETHAL
– – –
• LETHAL––
• TOXICITY FROM PARASITES–
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PROTOZOANS
• SINGLE CELLED – Eukaryotic organisms
• Amoeba– Paramoeba permaquidensis
• FLAGELLATED –– Ichthyobodo (Costia)– Cryptobia – Hexamita
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PHYLUM CILIOPHORA
• CILIATED2 + NUCLEI
– –
• Epistylis, Trichodina, Ichthyophthirius
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PHYLUM MICROSPORA
• THICK WALLED SPORES• LOMA - CYSTS IN GILLS
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PHYLUM MYXOZOA•
•
•
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MYXOBOLUS (MYXOSOMA) CEREBRALIS
• WHIRLING DISEASEFIRST RECORDED IN RBT FROM GERMANY - 1903USA IN FROZEN FISH 1956
• ORIGIN MAY HAVE BEEN NON- PATHOGENIC PARASITE OF NATIVE SALMONIDS CENTRAL EUROPE AND NORTHERN ASIA BROWN TROUT AND ATL SALMON
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M. CEREBRALIS
• TROPHOZOITES DEVELOP IN CARTILAGE – – –
• •
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M. CEREBRALIS
•
•
•
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ANNELID WORMTUBIFEX TUBIFEX
• INTERMEDIATE HOST STAGE – SEPARATE TAXONOMY –
• TRIACTINOMYXON – –
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VECTORS
• –
• • •
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CONTROL/PREVENTION
• CONCRETE RACEWAYS–
• IMMUNITY???–
• MANAGEMENT OF WILD STOCKSMONTANA, COLORADO–
• IDAHO - MISSING FISH ?
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REGULATIONS
• FISH DISEASE EMERGENCY MEETING
COLORADO MEETING 1988• DELISTING FROM “TITLE 50”
– –
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CERATOMYXA SHASTA
• SHASTA COUNTY 1948– Multicellular trophozoites– Mature spores
• TRANSMISSION– Water borne, seasonal
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C. shasta
• SALINITY – –
• Symptoms– – – –
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C. shasta
• Intestinal infection– –
• Kidney associated –
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Detection and Control
• DIAGNOSIS (confirmation)– – –
• CONTROL–
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PKD/PKX• Proliferative kidney disease
–
–
• Symptoms–
–
–
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METAZOAN PARASITES
•PLATYHELMINTHES - FLAT WORMS
• CESTODA - TAPEWORMS
• TREMATODES - DIVERSE
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CESTODES
• ADULTS USUALLY IN INTESTINAL TRACK VERTEBRATES
• HERMAPHRODITIC– –
• REPRODUCTION– –
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EXAMPLES OF LIFE CYCLES
• Proteocephalid cestodes (Taenia)– Two fishes 1° host (LMB) and 1st
intermediate host copepod, 2nd intermediate host is forage fish
• Ligula intestinalis, described in 1758 – Adult form in piscivorous birds, eggs
released to copepods (first intermediate host), to fish species (second intermediate host)
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TREMETODES
• MONOGENEA – –
• SPECIES SPECIFIC (some)– – –
• ANCHOR = PROHAPTOR, OPISHAPTOR• HERMAPHODITIC
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DIGENEA - FLUKES
• COMPLEX LIFE CYCLES – – – – – -
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OTHER FLUKES
• SANGUINICOLA–– – – –
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ACANTHOCEPHALA
• All require invertebrate host, usually arthropod (intermediate host)– –
• Fish is final host
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PHYLUM NEMATODA• MOST REQUIRE INTERMEDIATE
HOST – –– –
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Phylum ANNELIDA - Hirudinea
• Leeches feed on worms, insect larvae, snails, and all vertebrates including amphibians
• Bisexual
• Leeches attacking fishes are not host specific
• LEECHES (QUESTION IHNV?)
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PHYLUM ARTHROPODA
• CLASS CRUSTACEA• sub class COPEPODS -
SALMINCOLA - LERNAEA• BRANCHIURA - SEA LICE
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PHYLUM MOLLUSCA
• FW CLAMS• GLOCHIDIA
– Ecology of FW Clams/ Distribution of Molluscs ESA issues - Dams Obstruct Fish Passage