Previous studies have demonstrated that ovulatory female goldfish release a variety of sex steroids into the water where they function as a pheromonal blend dominated by C21 steroids that stimulates male hormone release, sperm production and behavior. This study investigated whether male goldfish might also release sex steroids with pheromonal activity. This created a ratio of C19 to C21 steroids of about that was dramatically different from that emitted by females The male olfactory system was also found to be extremely sensitive to AD, detecting it to near picomolar concentrations. Together with previous studies that have shown water-borne AD to increase male aggressive behavior while suppressing responsiveness to female pheromones, this study establishes AD as a male pheromone in the goldfish. Because ovulating females also release AD but in the presence of C21 steroids, recognition of the male-derived steroid pheromone is presumably mixture dependent.
The goldfish Carassius auratus is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is commonly kept as a pet in indoor aquariums , and is one of the most popular aquarium fish. Native to East Asia , the goldfish is a relatively small member of the carp family which also includes the Prussian carp and the crucian carp. It was first selectively bred for color in ancient China more than 1, years ago, and several distinct breeds have since been developed.
Citation of this paper. The present study investigated the breeding and feeding performance of goldfish, Carassiusauratus in the subtropical region of Haryana in the laboratory conditions. Male goldfish were divided into three different size classes i.
The behavioural response of spermiated male goldfish to the sex pheromone 17alpha,20ss-dihydroxypregnenone 17alpha,20ss-P in the ambient water was measured using a computerized video-image analysis system. The position and spontaneous locomotor activity of single spermiated male goldfish were continuously recorded in an artificial stream. The results showed that the fish spent significantly less time in water scented with 17alpha,20ss-P than in control water.