Zebrafish Health and Welfare Glossary - Welfare Terms, Head
Jonathan Knight
ng3
Zoltan Varga
HEAD
Parameter | Welfare Indicators | Sub Category | Synonyms | Definitions  | Severity Score | Picture |
---|---|---|---|---|---|---|
Skin | Lesion | Â | Wound | Â | Â | Â |
 |  | Open - Abrasion |  | Damage to the      skin consisting of   loss of the    epidermis and portions of the dermis but not the complete thickness of the skin. | Mild: *No more than 10% of body  Moderate: Covering not more than 20% of body Severe: Covering more than 20% of body, open |  |
 |  | Open - Incision |  | A wound created by a sharp object. Edges are smooth  and trauma to surrounding tissue is minimal | Mild: *No more than 10% of body Moderate: Covering not more than 20%    of body Severe: Covering more than 20% of body, open |  |
 |  | Open - Laceration |  | An irregular wound created by tearing of tissue. Damage to both superficial and underlying tissue is variable | Mild: *No more than 10% of body Moderate: Covering not more than 20% of body Severe: Covering more than 20% of body, open |  |
 |  | Open - Puncture |  | A penetrating    wound caused by pointed object | Mild: *No more than 10% of body Moderate: Covering not more than 20%    of body Severe: Covering more than 20% of body, open  |  |
 |  | Closed - Contusion |  | Damage of the skin and /or underlying structures without breaking     the skin e.g. bruising, crush | Mild: *No more than 10% of body Moderate: Covering not more than 20%    of body Severe: Covering more than 20% of body |  |
Skin | Masses under skin |  | Swellings Raised areas Lumps | Abnormal  appearance of masses or all descriptions (hard, soft, different    shapes etc.) | Mild: 1 mass under  the skin / fins which    is not affecting natural behaviour Moderate: Multiple massess under the  skin which is not affecting natural behaviour Severe: Multiple massess under the  skin and natural behaviour affected |  |
General | Reddening |  |  | Redend area on     the head, all of head | Mild: Reddening of head, not affecting development or  natural behaviours Moderate: Reddening of head, reduced development compared to controls, able to perform  natural behaviours Severe: Reddening of head affecting development and natural behaviours |  |
General | Small holes |  |  | Small holes / eroding pits in the head |  |  |
Eyes | Opacity |  |  | Presence of a  opaque object in/on the eye | Mild: Opacity of the eyes not affecting natural behaviour or development Moderate: Opacity of the eyes affecting development Severe: Opacity of   the eyes affecting development and natural behaviours |  |
Eyes | Damaged |  |  | Lesion (superficial growth or patch of  skin not resembling the surrounding area) on/in the eye |  |  |
Eyes | Protruding |  | Swollen Enlarged | Eye protruding from socket | Mild: Eyes slightly enlarged compared   to controls, not expected for strain,  not affecting natural behaviour Moderate: Eyes enlarged and slightly protruding, natural behaviour not   affected Severe: Eyes enlarged, protruding, reddening around eye, natural behaviour effected | ![]() ![]() |
Eyes | Swellings |  | Masses Raised areas Lumps | Abnormal  appearance of swellings or all descriptions (hard, soft, different    shapes etc.) on the outside of the   eye |  |  |
Eyes | Bleeding |  |  | Bleeding around the eyes |  |  |
Eyes | Bubble formation |  |  | Bubbles within the retro bulbar area |  |  |
Eyes | Deformed | Â | Â | Â | Â | Â |
 |  | Macro-opthalamia | Macrophthalamos Big eyes Enlarged Eyes | Abnormal  enlargement of  one of both of the eyes | Mild: Eyes slightly enlarged compared to controls, not expected for strain, not affecting natural behaviour Moderate: Eyes enlarged and slightly protruding, natural behaviour not affected Severe: Eyes enlarged, protruding, reddening around  eye, natural behaviour effected  |  |
 |  | Abnormal Shape |  | Abnormal shape |  |  |
Operculum | Operculum loss |  | Curled  operculum Red gills   visable | Operculum loss, leaving gill plates visible |  | ![]() |
Operculum | Bleeding from the operculum |  |  | Bleeding from    the operculum | Mild: Red liquid from operculum, no abnormal behaviour or anesthetised Moderate: Red liquid from operculum, increased or decreased operculum movement and not anesthetised Severe: Red liquid from operculum, decreased or increased operculum movement, inactive / lethargic even if provoked (non – responsive) and not anesthatised |  |
Operculum | Pale gills |  |  | Loss of colour within the gill plates |  |  |
Operculum | Reddening of the gills |  |  | Increased reddening of the gill plates |  |  |
Operculum | Yellowing of the gills | Â | Â | Yellow colouration of gills | Â | Â |
Mouth | Gasping |  | Rapid    breathing | Mouth opening  and closing rapidly, fish at surface of water |  |  |
Mouth | Malformed jaw |  | Abnormal   mouth | Jaws are positioned abnormally | Mild:Malformed jaw, not affecting development or  natural behaviours Moderate: Malformed jaw, reduced development compared to controls, able to perform  natural behaviours Severe: Malformed jaw, unable to perform natural behaviours, emaciation | ![]() |
Mouth | White swelling |  | Masses Raised areas Lumps | White swelling of cotton appearance |  |  |
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