![]() ![]() Three further laboratory hybridizations that we did and three done elsewhere yielded viable and, where tested (two intergeneric crosses in our lab), fertile offspring. Fritzsch found no difference in fertility between Astatotilapia nubila × Haplochromis “black lividus” hybrids and the parent species. Sex ratios were 2:1 female biased in F 1 and F 2 hybrids as well as in both parental species. Two females produced clutch sizes of 3.44 ± 3.34 fry per gram of body weight, and the first F 3 nest is now about to reach maturity. The hybrid F 2 was also fully viable and fertile. The F 1's were fully viable and did not suffer decreased fertility: nine females of the two F 1's produced clutch sizes of 2.64 ± 1.77 ( n = 5) and 4.84 ± 2.57 ( n = 4) fry per gram of body weight, versus 1.14 ± 1.29 ( n = 10) in the P. ![]() A phylogenetic analysis confirmed that they belong to two different genera (E. In an experiment that was started in 1994, we crossed two females of Platytaeniodus degeni with one male H.
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