Breeding Journal DataSheet
This first post should be updated regularly to include new information as events take place or changes are made to your system
General Species: Premnas biaculeatus
Social Structure: pair
Size of Individuals: female: 6 inches, male: 3 inches
Age of Individuals: female: unknown, has been in my care for since July 2010; male: unknown, captive bred and been in my care since January 2011.
Date added to Tank: The two were paired together in April 2011. They have been in the broodstock system since that time.
Broodstock Tank Details Size of Tank: broodstock tank is a blue rubbermaid tub with internal dimensions 19 in L x 13.5 in W x 10 in H ~11.1 gallons
Substrate Details: no substrate
Filtration Details: central filtration with homemade algal turf scrubber
Water Changes: 10% once a month
Water Temperature: 82 F
Lighting: ambient room lighting from shop lights
Lighting Cycle: 14 hours on, 10 hours off (reverse photoperiod on at 8pm, off at 10am)
Other Tank Inhabitants: no other fish, some live rock with bristle worms/other hitchhikers
Broodstock Feeding Details Food Types: Rod's Original frozen food, Rod's fish only frozen food, BSD Mariner Plus, rarely bloodworms
Feeding Schedule: 2-4 times daily (once approximately 6:30 am before work, then 1-3 times after 8pm depending on my schedule and whether I am ramping up or ramping down egg production)
Spawning Details Date of First Spawn: 8/5/11
Spawn Time of Day: exact time unknown, after mid-night while I was sleeping
Dates of Consecutive Spawns: 8/5/11; 8/14/11; 8/26/11; 9/12/11; 10/4/11; 11/8/11; 11/29/11; 12/11/11; 12/25/11; 1/24/12; 2/4/12; 2/23/12; 3/5/12; 3/15/12; 4/2/12 (began ramping down egg production end of March)
Courtship Details: male cleans inside of flower pot, no noticeable change in female's size - never looks gravid
Egg Size: approximately 1-2 mm
Egg Color: deep red
Egg Count: typically small nests. The 3/5/12 nest was the largest they have laid with approximately 300 still alive at time of pulling the nest.
Hatch Details Hatch Date: 3/11/12
Hatch Time of Day: unknown, hatch occurred during day (lights out) while at work
# Days after Spawn: 6 days
Larvae Description: smaller than A. ocellaris probably closer to 3 mm
Consecutive Hatch Dates: This is the only nest I have pulled from this pair, no nest made it to hatch until the 3/5/12 nest
Larval Tank Details Temperature: 78 F
Size of Larval Tank: 20 in dia X 20 in dia X 15 in High
Substrate Details: no substrate
Other Tank Decor: submersible heater with air line "tied" to it with a zip tie
Filtration Details: no filtration until meta
Lighting: ambient room lighting from shop lights
Lighting Cycle: 14 hours on, 10 hours off (reverse photoperiod on at 8pm, off at 10am)
Water Changes: siphon detritus as needed, 5% water change done every 4 days for this batch
Larval Feeding Details Food Types: L strain rotifers, rotifers fed RotiGrow Plus twice daily when in culture vessel. Rotifers fed RotiGreen twice daily when in larval tub.
Feeding Schedule: Rotifers added to larval tub at 8pm the first day after hatching. Samples taken and based upon an estimate of the the concentration of rotifers in larval tub I will either add rotifers if appears to be low, or refrain from adding rotifers if the larvae cannot keep up with the rotifer production rate. The maroons were pretty voracious, so I added rotifers on 3/5/12, 3/7/12, 3/8/12, 3/9/12, and 3/11/12 to 3/15/12 and then 3/17/12 to 3/23/12. By 3/23/12 most of the larvae had passed through meta and I was feeding Otohime A by that time.
Metamorphosis/Settlement Date of Settlement Start: 3/22/12
Days after Hatch: 11
Date of Settlement End: 3/25/12
Description of Fry: Dark in coloration, many were/are misbarred. By the time of transfer to grow-out, most of the maroons had 2-3 white stripes (or misbarred pieces of white stripes). These are the most belligerent fry I have ever raised - far more aggressive than either melanopus or frenatus. They are constantly fighting and subsequently I have several with pieces missing from their tails.
Grow-Out Tank Details Temperature: 78 F
Size of Grow-Out Tank: 20 gallon high
Substrate Details: bare bottom
Other Tank Decor: none
Filtration Details: central filtration with bioballs, algal turf scrubber, carbon, HSA 1000 skimmer
Lighting: ambient room lighting from shop lights
Lighting Cycle: 14 hours on, 10 hours off (reverse photoperiod on at 8pm, off at 10am)
Water Changes: 15% monthly
Size at Transfer: 5-6 mm
Age at Transfer: 30 days post hatch
Grow-Out Feeding Details Food Types: BSD Mariner plus
Feeding Schedule: 2-3 times daily
Additional Information (No Pictures or Videos in the Section Please) Miscellaneous Information: These fish are in grow-out along with a batch of A. percula which are a month older. If the percula were the same size as the maroons I have no doubt that the maroons would have largely killed them or maimed them by now. I may have to spread the maroons across several grow out tanks to prevent them from completely killing each other and ganging up on any non-maroon clowns in grow-out.
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