Just thought i would share some Photos and details of the Black Diamond that i lost.
Never know when this info might help out in the future or when other people suffer similar occurrences.
Species: Potamtrygon Leopoldi
sex:male (fully mature)
age:approximately 3 years
size:16" diameter
tank size: 8ft by 30 " by 2ft
temperature: 28
ph: 6
NH3: 0
NO2-: 0
NO3-: less than 20ppm
diet: shrimp(raw and cooked), pollock, massivore pellets. But predominantly shrimp.
Notes/observations: never been a great feeder or calm ray, always climbing the walls of the tank, never settled. Would go off food for no reason. for the last 6 months has been trying to breed with two marble motoro females who are only just maturing. ! day prior to its death one of the females took two bites out the ray which are noticeable in the pictures.
Ray went from swimming and feeding to death curl then death in less than 12 hours, Which suggested an organ failure or injury rather than a pathogen/parasite as environmental causes could be ruled out as conditions perfect and most recent water change more than 48 hrs earlier and no other rays or fish displaying symptoms.
The red marks/inflammation on the underside of the ray was post mortem. Autopsy carried out less than 12 hours after death.
Also their where no puncture wounds from the females spine.
My first thought was an intestinal problem as the rays belly was distended. upon carefully opening the ray, after having removed the two spines (as they are still poisonous after death!), it soon became clear that the liver was larger than normal (i have performed autopsies on numerous large koi before, this being my 6th ray). The rest of the organs appeared healthy, there was normal digested intestinal contents and the paired testes appeared normal also.
Upon further research the hepatosomatic relation (HSR%) was calculated by the expression: liver weight (g)/body weight (g) x 100 the resulting figure of 5.5 was high in comparison to figures of wild stingrays which averaged between the rainy season and dry season of between 1.5 and 3.5.
Obviously none of this conclusively proves the cause of death it is however likely that the enlarged liver resulted in the death after the stress/injury/damage caused by the two bite marks from the female ray and subsequently meaning the male rays hepatic system could not cope.
Hope this proves helpful to someone at some point.
Never know when this info might help out in the future or when other people suffer similar occurrences.
Species: Potamtrygon Leopoldi
sex:male (fully mature)
age:approximately 3 years
size:16" diameter
tank size: 8ft by 30 " by 2ft
temperature: 28
ph: 6
NH3: 0
NO2-: 0
NO3-: less than 20ppm
diet: shrimp(raw and cooked), pollock, massivore pellets. But predominantly shrimp.
Notes/observations: never been a great feeder or calm ray, always climbing the walls of the tank, never settled. Would go off food for no reason. for the last 6 months has been trying to breed with two marble motoro females who are only just maturing. ! day prior to its death one of the females took two bites out the ray which are noticeable in the pictures.
Ray went from swimming and feeding to death curl then death in less than 12 hours, Which suggested an organ failure or injury rather than a pathogen/parasite as environmental causes could be ruled out as conditions perfect and most recent water change more than 48 hrs earlier and no other rays or fish displaying symptoms.
The red marks/inflammation on the underside of the ray was post mortem. Autopsy carried out less than 12 hours after death.
Also their where no puncture wounds from the females spine.
My first thought was an intestinal problem as the rays belly was distended. upon carefully opening the ray, after having removed the two spines (as they are still poisonous after death!), it soon became clear that the liver was larger than normal (i have performed autopsies on numerous large koi before, this being my 6th ray). The rest of the organs appeared healthy, there was normal digested intestinal contents and the paired testes appeared normal also.
Upon further research the hepatosomatic relation (HSR%) was calculated by the expression: liver weight (g)/body weight (g) x 100 the resulting figure of 5.5 was high in comparison to figures of wild stingrays which averaged between the rainy season and dry season of between 1.5 and 3.5.
Obviously none of this conclusively proves the cause of death it is however likely that the enlarged liver resulted in the death after the stress/injury/damage caused by the two bite marks from the female ray and subsequently meaning the male rays hepatic system could not cope.
Hope this proves helpful to someone at some point.
