Zebrafish Health and Welfare Glossary - Welfare Terms, Head

HEAD

ParameterWelfare Indicators

Sub Category 

Synonyms

Definitions

 

Severity Score 

Picture
SkinLesion Wound   
  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

 
SkinMasses 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

 
GeneralReddening  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

 
GeneralSmall holes  Small holes / eroding pits in the head  
EyesOpacity  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

 
EyesDamaged  Lesion (superficial growth or patch of   skin not resembling the surrounding area) on/in the eye  
EyesProtruding 

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

EyesSwellings 

Masses

Raised areas

Lumps

Abnormal   appearance of swellings or all descriptions (hard, soft, different     shapes etc.) on the outside of the    eye  
EyesBleeding  Bleeding around the eyes  
EyesBubble formation  Bubbles within the retro bulbar area  
EyesDeformed     
  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  
OperculumOperculum loss 

Curled   operculum

Red gills    visable

Operculum loss, leaving gill plates visible 
OperculumBleeding 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

 
OperculumPale gills  Loss of colour within the gill  plates  
OperculumReddening of the gills  Increased reddening of the gill plates  
OperculumYellowing of the gills  Yellow colouration of gills  
MouthGasping Rapid     breathingMouth opening   and closing  rapidly, fish at surface of water  
MouthMalformed jaw Abnormal    mouthJaws 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

MouthWhite swelling 

Masses

Raised areas

Lumps

White swelling of cotton appearance