Day 1: December 25, 2010: Between 6:00pm and 7:00pm.
Conditions before spawning:
Due to a body injury on the male fish, I was administering an antibiotic / aquarium salt treatment. (See other post.)
The temperature was raised to 27 Celsius for the past 3 days.
Added today 1 tbsp of aquarium salt after having added approx. 4 L of fresh water (to top it.)
Added 12 ml of Melafix by API. (this is the 4th day of dosing and 2 tbs of aquarium salt was added on day 1 of treatment.)
Parameters:
Temp.: Stable for 4 days at 26-27 Celsius.
pH: Stable at approx. 8.0
Ammonia: Not tested. Usually 0.
Nitrite:L Not tested, usually 0.
Nitrates: Not tested, usually approx. 5.0 ppm.
Note, I took out the carbon for antibiotic treatment.
Observed behavior prior to spawning:
Pair locked mouths and sparred occasionally. Female sustained light injuries to pectoral fins. (She is a veil variety Angelfish.)
A few hours prior to spawning, the pair thoroughly cleaned one leaf of Java fern which was positioned on an angle. The female pushed on it downwards as hard as she could, as though to test its rigidity and resistance. Both male and female took part in the cleaning process. A newer, cleaner and healthy Java fern leaf was selected as a spawning site but unfortunately, very close to the filter intake.
Both fish had breeding tubes out for a few days. This morning, the female's breeding tube was completely out and pinkish in color instead of whitish has previously observed. The male tube is very small (...) but a more extended then usual.
I did not witness the mating ritual but saw that the female had sustained minor injuries to the pectoral fins (mainly shredding) and both had sustained minor injuries to the mouth region. The male also showed minor shredding of the caudal fin. Approx. a 100 eggs had been laid on the selected and previously cleaned site. Both fish take turns to hover close to the eggs and fan them as expected.
Other inhabitants, two small glowlight tetras, are kept at bay without excessive aggression.
Fed the pair an extra meal of frozen brine shrimps to provide protein after spawning.
Fish show more sign of aggression,or alertness, then usual towards me as I approach the tank.
08:20pm: The male makes more passes on the eggs and touches them with his papilla. I do not know if the eggs are fertilized or not. Eggs look whitish but still semi-translucent.
Note: if eggs turn completely white within 24 hours, they were not fertilized and should be removed to avoid decay.
Day 2: December 26, 2010
09:00am: The majority of the eggs are still there. Only a few have turned white. They are smaller and have turned a very bright, opaque white. The other eggs might be fertilized. Will know in 12 more hours. Parents are still locking mouths and battling. Minor mouth injuries have been sustained.
10:30am: The female mostly, comes to fan the eggs periodically. She seems to be picking out ONLY the white, unfertilized ones, while the viable ones remain undisturbed. While the parent fans the nest, the white ones, which do not stick properly to the leaf surface, are plopped off and consumed.
Day 3: December 27, 2010.
The male attacked the female last night and wounded her chin slightly. She remained hidden behind some plants for a good while. This morning, all eggs had been consumed and the spawning site is empty. This was to be expected.