Artificial spawning was induced in 74 wild matured Pacific abalone Haliotis discus hannai collected at Taro, Iwate prefecture, in September 2005.The spawning was conducted just after the sample collecting. The relationship between the shell length (X mm) and number of spawned eggs (Y) is expressed by the equation: Y=0.000096 X5.073481 For abalones of shell length <70 mm, as the shell length decreased, the spawning rate decreased. The results also suggest that the rate of total number of spawned eggs for the population of shell length >90 mm was 59.5%, although the actual frequency found in that area was 23.1%.
The physiological role of taurine on bile salt metabolism in yellowtail Seriola quinqueyadiata fed on soybean protein diets supplemented with graded levels of taurine were investgated by a 41-weeks rearing trial. Among the dietary treatments, fish given a non-taurine supplemented diet showed the lowest biliary bile salt, hepatic taurine and plasma cholesterol levels, but the highest plasma 7α-hydroxycholesterol concentration. In addition, the non-taurine supplemented diet induced the hightest proportion of cholyltaurine in gallbladder bile. However, dietary taurine improved these variables with increasing in supplement levels to soybean protein diet.