Disease

Disease can be externally evident. Possibilities include visualization of infecting organisms such as parasites and microbial growth or obvious signs such as lesions. This gallery includes non-salmonid hosts as well as marine hosts.

Female (left) and male (right) Cutthroat Trout. Female with gill maggots on base of her right pectoral and pelvic fins.
Female (left) and male (right) Searun Coastal Cutthroat Trout (Oncorhynchus clarkii clarkii). Female is infested with gill maggots (Salminicola californiensis) on base of her right pectoral and pelvic fins.
Actinopterygii Alaska Alaska wild salmon arthropod Arthropoda Chordata Class Actinopterygii Class Hexanauplia Coastal Cutthroat Trout Cordova Eccles Creek Infraclass Teleostei Invertebrate Lernaeopodidae Neopterygii Oncorhynchus clarkii Oncorhynchus clarkii clarkii Order Siphonosstomatoida Pacific trout Phylum Arthropoda Phylum Chordata Prince William Sound Salmincola californiensis Salmonidae Salmoniformes Salmoninae Seacam underwater housing Searun Coastal Cutthroat Trout South Central Alaska Spring Subclass Copepoda Subclass Neopterygii Subphyllum Crustacea Teleost Teleostei United States Vertebrate biosphere chordate copepod crustacean diadromous diadromy fresh water freshwater gill lice gill maggot in situ iteroparity iteroparous lotic marine life migratory naturalworld nature parasite searun stream under fresh water underwater underwater photography underwaterphoto wild wild salmon wild trout
Spawning act
Coho Salmon (Oncorhynchus kisutch) in the act of spawning. A sneaker male that rushed in after spawning commenced is gaping close to the camera revealing several gill lice (Salmincola californiensis) in its mouth.
Actinopterygii Alaska arthropod Arthropoda Autumn Chordata Class Actinopterygii Class Hexanauplia Coho Salmon Infraclass Teleostei Invertebrate Lernaeopodidae Neopterygii Oncorhynchus kisutch Order Siphonosstomatoida Pacific salmon Phylum Arthropoda Phylum Chordata Salmincola californiensis Salmonidae Salmoniformes Salmoninae Seacam underwater housing Silver Salmon South Central Alaska Subclass Copepoda Subclass Neopterygii Subphyllum Crustacea Teleost Teleostei United States Vertebrate anadromous anadromy biosphere chordate copepod crustacean diadromous diadromy fresh water freshwater gill lice gill maggot in situ lotic migratory naturalworld nature parasite semelparity semelparous spawning spawning act spawning behavior stream under fresh water underwater underwaterphoto wild
Gaping male Coho salmon with parasites in mouth.
Gaping male Coho Salmon (Oncorhynchus kisutch) revealing parasitic copeods (Salmincola californiensis) known as gill maggots) in his mouth. Aspect ratio = 2:3.
Actinopterygii Alaska Alaska wild salmon arthropod Arthropoda Autumn Chordata Class Actinopterygii Class Hexanauplia Coho Salmon Infraclass Teleostei Invertebrate Lernaeopodidae Neopterygii Oncorhynchus kisutch Order Siphonosstomatoida Pacific salmon Phylum Arthropoda Phylum Chordata Salmincola californiensis Salmonidae Salmoniformes Salmoninae Seacam underwater housing Silver Salmon South Central Alaska Subclass Copepoda Subclass Neopterygii Subphyllum Crustacea Teleost Teleostei United States Vertebrate anadromous anadromous fish anadromy biosphere chordate copepod crustacean diadromous diadromy fresh water freshwater gill lice gill maggot in situ lotic marine life migratory naturalworld nature parasite semelparity semelparous stream under fresh water underwater underwater photography underwaterphoto wild wild salmon
Searun Coastal Cutthroat Trout in a small stream
Searun Coastal Cutthroat Trout (Oncorhynchus clarkii clarkii) in the dappled light of a small tributary of Prince William Sound, Alaska. There are Salminicola parasites on the right pectoral fin of the nearest trout.
Actinopterygii Alaska Alaska wild salmon arthropod Arthropoda Chordata Class Actinopterygii Class Hexanauplia Coastal Cutthroat Trout Cordova Eccles Creek Infraclass Teleostei Invertebrate Lernaeopodidae Neopterygii Oncorhynchus clarkii Oncorhynchus clarkii clarkii Order Siphonosstomatoida Pacific trout Phylum Arthropoda Phylum Chordata Prince William Sound Salmincola californiensis Salmonidae Salmoniformes Salmoninae Seacam underwater housing Searun Coastal Cutthroat Trout South Central Alaska Spring Subclass Copepoda Subclass Neopterygii Subphyllum Crustacea Teleost Teleostei United States Vertebrate biosphere chordate copepod crustacean dappled light diadromous diadromy fresh water freshwater gill maggot in situ iteroparity iteroparous lotic marine life migratory naturalworld nature searun stream under fresh water underwater underwater photography underwaterphoto wild wild salmon wild trout
Streaming tapeworms
Loose tapewrorms (cestodes) snagged and streaming off of woody debris in a salmon stream. The source (host) of these tapeworms is unknown to me.
Actinopterygii Alaska Alaska wild salmon Autumn Chordata Class Actinopterygii Class Cestoda Coho Salmon Infraclass Teleostei Invertebrate Neopterygii Oncorhynchus kisutch Pacific salmon Phylum Chordata Phylum Platyhelminthes Platyhelminthes Salmonidae Salmoniformes Salmoninae Seacam underwater housing Silver Salmon South Central Alaska Subclass Neopterygii Teleost Teleostei United States Vertebrate biosphere chordate flatworm fresh water freshwater in situ lotic marine life naturalworld nature stream tapeworms under fresh water underwater underwater photography underwaterphoto wild wild salmon
Round Whitefish infected with Saprolegnia
Round Whitefish (Prosopium cylindraceum) infected with the protozoan Saprolegnia on its cadal peduncle in an Alaska, USA stream during the summer.
Actinopterygii Alaska Alaska wild salmon Chinook Salmon Chordata Class Actinopterygii Class Oomycota Coregoninae Family Saprolegniaceae Infraclass Teleostei King Salmon Kingdom Chromalveolata Neopterygii Oncorhynchus tshawytscha Order Saprolegniales Pacific salmon Phylum Chordata Phylum Heterokontophyta Plant Prosopium cylindraceum Round Whitefish Salmonidae Salmoniformes Salmoninae Saprolegnia Seacam underwater housing South Central Alaska Subclass Neopterygii Summer Superphylum Alveolata Teleost Teleostei United States Vertebrate biosphere chordate cotton mold fresh water freshwater in situ iteroparity iteroparous lotic migratory naturalworld nature underwater underwaterphoto wild
Sockeye Salmon with Lamprey scar
Mature Sockeye Salmon (Oncohynchus nerka) female on spawning grounds with partially healed Lamprey scar.
Actinopterygii Alaska Alaska wild salmon Chordata Class Actinopterygii Infraclass Teleostei Neopterygii Oncorhynchus nerka Pacific salmon Phylum Chordata Red Salmon Salmonidae Salmoniformes Salmoninae Seacam underwater housing Sockeye Salmon South Central Alaska Subclass Neopterygii Teleost Teleostei United States Vertebrate anadromous anadromy biosphere chordate diadromous diadromy fresh water freshwater in situ lamprey scar lotic migratory naturalworld nature semelparity semelparous stream under fresh water underwater underwaterphoto wild wild salmon
Pacific Herring
Underwater view of juvenile Pacific herring (Clupea pallasii; Clupeidae) rearing in Cordova harbor, Prince William Sound, South Central Alaska. Sea lice (Caligus clemensi; Copepoda: Caligidae) are attached to some of the herring.
Actinopterygii Alaska Alaska wild salmon Autumn Chordata Class Actinopterygii Clupea pallasii Clupeidae Harbor Infraclass Teleostei Neopterygii Pacific Herring Phylum Chordata Seacam underwater housing South Central Alaska Subclass Neopterygii Teleost Teleostei United States Vertebrate biosphere chordate herring research in situ marine life naturalworld nature underwater underwater photography underwaterphoto wild
Spawned-out Pink (humpback) Salmon covered with Saprolegnia
Spawned-out Pink (humpback) Salmon (Oncorhynchus gorbuscha) covered by the protozoan referred to as cotton mold (Saprolegnia) beginning the decomposition process that will eventually transform the carcass to mineral nutrients. Photo taken under water in Hartney Creek, a tributary of Prince William Sound. Summer, South Central Alaska.
Actinopterygii Alaska Alaska wild salmon Chordata Class Actinopterygii Class Oomycota Family Saprolegniaceae Humpback Salmon Infraclass Teleostei Kingdom Chromalveolata Neopterygii Oncorhynchus gorbuscha Order Saprolegniales Pacific salmon Phylum Chordata Phylum Heterokontophyta Pink Salmon Plant Salmonidae Salmoniformes Salmoninae Saprolegnia Seacam underwater housing South Central Alaska Subclass Neopterygii Superphylum Alveolata Teleost Teleostei United States Vertebrate anadromous anadromy biosphere chordate cotton mold diadromous diadromy fresh water freshwater in situ lotic migratory naturalworld nature searun semelparity semelparous stream under fresh water underwater underwaterphoto wild wild salmon
Quillback Rockfish
Quillback Rockfish (Sebastes maliger) with a parasitic isopod on its dorsal fin. Aspect ratio = 4:5.
Actinopterygii Alaska Alaska wild salmon Barkley Sound British Columbia Canada Chordata Chup Point Class Actinopterygii Infraclass Teleostei Neopterygii Phylum Chordata Quillback Rockfish Rendezvous Dive Adventures Scorpaenidae Scorpaeniformes Seacam Seacam underwater housing Sebastes maliger South Central Alaska Subclass Neopterygii Teleost Teleostei Tyler Rock United States Vertebrate biosphere chordate in situ marine marine life naturalworld nature parasite scuba scuba diving underwater underwater photography underwaterphoto wild
Black Rockfish
Black Rockfish (Sebastes melanops) with a parasitic copepod with twin egg cases on a dorsal fin spine. Aspect Ratio = 2:3.
Actinopterygii Alaska Alaska wild salmon Barkley Sound Black Rockfish British Columbia Canada Chordata Class Actinopterygii Infraclass Teleostei Neopterygii Phylum Chordata Scorpaenidae Scorpaeniformes Seacam underwater housing Sebastes melonops South Central Alaska Subclass Neopterygii Teleost Teleostei United States Vertebrate biosphere chordate in situ marine marine life naturalworld nature parasite scuba scuba diving underwater underwater photography underwaterphoto wild