Will crossing to Ryukin improve the standard Pearlscale?
In addressing the prevailing issue of limited diversity within Pearlscale Goldfish, where approximately 90% of specimens exhibit a recurring red and white nacreous coloration, our endeavour to introduce novel characteristics led us to a strategic outcrossing initiative with a distinct breed. It is particularly difficult to find a Fancy Goldfish species without a moderate wen growth; though a beautiful characteristic of the Hamanishiki, wen is unwanted on your Classic Pearlscale and the fish is more likely to headstand (unbalanced, leaning forward). Recognizing the merits of the Ryukin variety for its pointed head, minimal wen growth, and short, rounded body, along with its expansive colour palette, we sought to infuse these desirable attributes into the Pearlscale lineage.
Our initial cross involved a nacreous Ryukin boasting a captivating white colour and black dot pattern, sourced from a line that showcased other commendable patterns (Kirin). While ou primary intent with the first generation was to retain the nacreous trait for potential pattern recreation, a notable development emerged during the maturation process. A particular metallic fish underwent a remarkable transformation from brown to orange, then ultimately adopting a unique hue where only its fins and one gill plate retained a deep red pigment (photos added below). This unexpected revelation prompted a strategic shift in focus, redirecting our breeding efforts toward cultivating this distinctive coloration rather than adhering strictly to the original pattern.This Ryukin x Pearlscale had the deep, circular side-view shape of the Pearlscale but no calcium deposits in the scales, which we had expected.Â
Subsequent generations were bred through a union of the Ryukin/Pearlscale hybrid and another metallic Pearlscale, with intriguing outcomes manifesting in a varied spectrum of fry. Despite a genetic makeup comprising 75% Pearlscale and 25% Ryukin, a pronounced dichotomy emerged, yielding offspring closely resembling either Ryukin or exceptionally appealing Pearlscale specimens (photos added below). At their current size of approximately an inch and a half to three inches, a discernible trajectory suggests that by selectively breeding the most conformationally Pearlscale-like individuals, there is potential for substantial enhancement in colouration and diminution of head growth within the Pearlscale lineage. It is worth noting, however, that this progress may entail a trade-off, potentially impacting the overall width of the fish.
What are your predictions for the future offspring? Can we reproduce the pattern? Let us know!
Really interesting read!