Comparative Study of the Feeding Characteristics and Digestion Physiology of Haliotis discus hannai and Haliotis gigantea

Abalone ( Haliotis spp.) are typical nocturnal creatures but discus hannai is bold and active in the nighttime whereas H. gigantea tends to be timid inactive. In this study, we quantified compared differences movement, feeding, digestive physiology between as well potential molecular mechanisms on basis of video observations expression levels genes related feeding regulation. The behaviors both species were characterized by significant circadian rhythms P < 0.05). However, distance moved cumulative duration movement 2.61 1.94 times higher, respectively, than over 24-h cycle. was only 1.15 that , time a percentage (FTP) up 94.6% for 56.0% . peaks α-amylase activity NPF peak OX 2 R level occurred during 20:00–00:00 h. By contrast, alginate lyase NPYR at 16:00 h, when FTP significantly higher These initial findings quantify specific behavior parameters thus provide reference selection appropriate strategies proliferation abalone via bottom sowing.