Zebrafish Health and Welfare Glossary - Welfare Terms, Head
HEAD
Parameter | Welfare Indicators | Sub Category | Synonyms | Definitions
| Severity Score | Picture |
|---|---|---|---|---|---|---|
Skin | Lesion |
| Wound |
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| 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 |
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| 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 |
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| 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 |
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| 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
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| 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 |
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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 |
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General | Reddening |
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| 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 |
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General | Small holes |
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| Small holes / eroding pits in the head |
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Eyes | Opacity |
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| 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 |
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Eyes | Damaged |
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| Lesion (superficial growth or patch of skin not resembling the surrounding area) on/in the eye |
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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 |
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Eyes | Bleeding |
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| Bleeding around the eyes |
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Eyes | Bubble formation |
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| Bubbles within the retro bulbar area |
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Eyes | Deformed |
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| 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
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| Abnormal Shape |
| Abnormal shape |
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Operculum | Operculum loss |
| Curled operculum Red gills visable | Operculum loss, leaving gill plates visible |
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Operculum | Bleeding from the operculum |
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| 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 |
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Operculum | Pale gills |
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| Loss of colour within the gill plates |
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Operculum | Reddening of the gills |
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| Increased reddening of the gill plates |
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Operculum | Yellowing of the gills |
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| Yellow colouration of gills |
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Mouth | Gasping |
| Rapid breathing | Mouth opening and closing rapidly, fish at surface of water |
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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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