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Fish disease movies
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Click the right-hand mouse button if you want to down-load any of the movies (click "save target as....). The file sizes have been kept reasonably small, hopefully without losing too much detail - they will take a minute or two to download- depending on your modem speed. Let them fully download before playing them. If you are using Windows Media Player, click the pause button and then you will see when the movie has fully loaded. All videos are in mpeg format. |
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 Argulus
01 (fish louse) (285 kb) High power magnification giving a
fish's view of this nasty parasite. It shows the highly flexible
suckers that the louse uses to attach to the fish's body. In
between the suckers you can see a large, flexible proboscis-like mouth
that the louse uses to suck out the fish's body fluids - nice!
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Argulus 02
(fish louse) (213 kb) Low power view of Argulus
(x100) - showing egg-sac, legs, suckers etc. |
Chilodonella
01 (315 kb) Shows Chilodonella at
100 x magnification. The parasite is flat, oval to heart shape with a
notched anterior end. Characteristic gliding action, moving slowly and
turning in circles. Flattened shape can be seen when the parasite
turns sideways. |
Chilodonella 02
(430 kb) Shows Chilodonella x 400 magnification
in phase contrast. You can just about see the characteristic bands of
cilia |
Ichthyobodo -
(Costia 01) (373 kb) Costia shown at
600 x magnification. A very fast moving parasite. Characteristic
flickering motion as it turns its crescent-shaped body. |
Dactylogyrus 01
(Gill fluke) (212 kb) A gill fluke on the edge
of a gill filament at 100x magnification. Characteristic black eye-spots
with scalloped head. You can see trichodinids in the background. |
Dactylogyrus 02
(Gill fluke) (414kb) Magnification x600
showing fluke being parasitised by trichodinids - obviously dog eat dog! |
Dermocystidium 01
(306 kb) An uncommon fungal-type disease that affects
koi. Note the intact immature nodules and the ruptured lesions showing
white hyphae. |
Gyrodactylus 01
(skin fluke) (378 kb) Gyrodactylus
can be differentiated from Dactylogyrus by the absence of eye-spots.
This movie shows Gyrodactylus at 100x magnification. Note the
embryo clearly visible in abdomen (the hooks of the embryo are visible).
Also note the arrangement of attachment hooks at rear end
(opisthohaptor). |
Gyrodactylus 02
(skin fluke) (325 kb) Gyrodactylus
at x 600 magnification shows the fearsome arrangement of hooks on the
opisthohaptor together with a pair of hooks in the abdomen - the
yet-to-be-born embryo! No wonder fish flash and jump! |
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Trichodina 01
(from the gill of a koi) (358 kb) High power
(x600) shows trichodinids grazing on the gill filaments of a koi. Note
the whirling cilia (minute 'hairs' used for motion and to fan food into
the mouth). Typical 'flying saucer' motion. Gill trichodinids are
usually smaller than skin-dwelling trichodinids (<30 µm). |
Trichodina 02
(from the skin of a koi) (112 kb) Not a lot of
movement but it shows a typical wet mount of a mucus scrape x 100. |
Ichthyophririus
multifilis (white spot 01) (376 kb)
Shows typical wet mount at x100 magnification. Large dark parasites
(trophonts) with typical horseshoe macronucleus clearly visible. White
spot has a lazy rolling action. Note the variance in size of the
trophonts. |
White spot 02
(334 kb) Higher magnification and phase contrast
(x600) shows rows of cilia beating, providing means of motion.
Whitespot is a holotrich ciliate - the cilia are distributed evenly over
the entire body surface. |
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For further details of fish parasites see the fish
disease section |
Filter Microorganism Movies
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Plumatella 01
(283 kb) Plumatella
sp. A freshwater Bryozoan (moss animal). A shy, charming little
animal that lives in some filters. It is a beneficial organism that
lives on smaller protozoa, bacteria, algae and just about anything it
can trap with its tentacles. |
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