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We examined changes in the histology, physiology and enzymatic activity of the diges- tive gland — as well as changes in morphology and feeding behavior — of Octopus maya during rear- ing, to define the phases characterizing post-hatching development. Morphometric changes showed that juvenile O. maya exhibited a non-growth phase during the first 10 d post-hatching (DPH). Histo- logical analysis revealed that the digestive gland morphology changed with age, from a simple tubu- lar gland in octopuses 2 DPH to a tubulo-acinar and vacuolar structure with digestive cells character- ized by vacuoles in octopuses 45 DPH. Digestive enzyme activity was erratic until 14 DPH, after which the activity started to stabilize. O. maya at 2 and 3 DPH rarely presented attack responses to either visual or both visual and chemical stimuli from prey. In contrast, at 4 DPH, octopuses responded to visual stimuli from crabs and palaemonids, but did not display preference in attacking either prey type. Based on our results, we have defined for the first time 2 phases in the early life his- tory of O. maya: post-hatching and juvenile.

sexuality and early development in aquatic organism/aquatic biology/sexuality and early development in aquatic organisms

Morphological, physiological and behavioral changes during post-hatching development of Octopus maya (Mollusca: Cephalopoda) with special focus on the digestive system