It has been a year since my last update. Just to review the project, I have bought some yellow commets. I crossed them with my double tail goldfish. I thought the double tail was of yellow color. Later on, the fish turned into mandarin orange color, and the eyes turned into strange color (perhaps albino). I did not documented it well, so I cannot provide any picture. Anyway, it came from the red white double tail goldfish. So, I will consider the gene as plain red / red white goldfish.

The result of the cross was 100 percent orange (red / red white), and 100 percent single tail. No yellow appeared. And no double tail at all. Some of the tail are long, some are short. Here they are:

As they matured, I did F1 x F1. The results are varied. I collect 2 batches of them. Here are the stats:

Batch 1:

Total 77 offspring. Single tail are 61 (79.2%). Double tail are 16 (20.8%). I can easily separate the single from the double early without the need to wait for the mutation process. However, some of them did not survive along the way. The survivor are 73. The desired yellow double tail are only 3 (4.1%). Orange double tail are 11 (15.1%). Yellow single tail are 14 (19.2%). Orange single tail are 45 (61.6%). So, the desired yellow double tail are only 3 pieces. Two of them are defect. That means, I keep only 1 from this batch.

Batch 2:

Total 541 offspring. Single tail are 432 (79.8%). Double tail  are 109 (20.2%). The stats can be said as the same as that of batch 1. The survivor are only 287. Most of them are stunted and did not survive. From the survivor, the desired yellow double tail are 21 (7.3%). Orange double tail are 55 (19.2%). Yellow single tail are 57 (19.9%). Orange single tail are 154 (53.6%).  From the  21 desired yellow double tail, 12 are defect. So I keep 9 desired results.

Here are some pictures to compare the yellow double tail and orange double tail. Pardon me for the bad pictures.

What type of goldfish are these yellow ones? They do not belong to the popular category such as ryukin, oranda or ranchu. They looks like wakin, perhaps with smaller body and longer tail. Actually, this is my regret. I think I should use a more popular type to cross with the yellow commet from the start. Anyway, it already happens. I need to decide what to do next. Shall I breed them just to get more uncategorized yellow goldfish? Or shall I cross them with more popular type? Perhaps I can produce yellow oranda, yellow ryukin, yellow pompom, or just yellow wakin. I will decide later.