CATDOLL : CATDOLL: How to distinguish male and female yellow catfish

Secondary sexual characteristics: Behind the pelvic fin of female yellow catfish are the anus, genital opening, and urinary opening. When lifted up from the back, the outline of the ovary can be observed. The genital opening is very obvious, red and swollen and slightly protruding. Behind the pelvic fin of male yellow catfish are the anus and genital protrusion (the opening at the end of the protrusion is the cloaca). The genital protrusion is about 0.5-0.8cm long and nipple-shaped.

Growth rate: The individual size and growth rate of female yellow catfish are both lower than those of male yellow catfish. During a breeding cycle, the weight of male fish can reach more than 0.1kg, while that of female fish is generally less than 0.1kg.

1. Differentiation of secondary sexual characteristics

1. Female fish

(1) Behind the pelvic fin of the female yellow catfish are the anus, genital pore, and urinary pore, among which the genital pore and urinary pore are very close.

(2) Female yellow catfish are relatively short and thick, with a round, full and elastic abdomen. When lifted from the back, the outline of the ovaries can be clearly seen. The reproductive foramen is very obvious, red, swollen and slightly protruding.

2. Male fish

(1) Behind the pelvic fin of a male yellow catfish are the anus and the genital protuberance, with the opening at the end of the genital protuberance being the cloaca.

(2) The male fish's reproductive protuberance is located in front of the anal fin and behind the anus, about 0.5-0.8 cm, nipple-shaped, and slightly red.

2. Growth rate distinction

1. Male yellow catfish are larger and grow faster than female ones.

2. Within a breeding cycle, male yellow catfish can generally reach more than 0.1kg, meeting the sales standards, and larger individuals can even reach more than 0.25kg. However, most female yellow catfish weigh less than 0.1kg, and some even weigh less than 0.025kg.