Ethological Studies on the Jellyfish, Crambionella orsini (Vanhöffen, 1888)(Scyphozoa: Catostylidae) in Captivity
Publication Type: |
Journal Article |
Year of Publication: |
2021 |
Authors: |
KR Soumya, A Riyas, S Mithun, A Biju Kumar |
Publication/Journal: |
Journal of Aquatic Biology & Fisheries |
Keywords: |
acclimatization, aquarium adaptability, Artemia, behaviour, feed preference, jellyfish, light response, pulsation rate |
Abstract:
Jellyfishes, especially those cnidarians in the class Scyphozoa, Cubozoa and Hydrozoa, are integral components of marine biodiversity, which are also used extensively for research in ethology to bioengineering. They are also extensively used as exhibits in public aquaria. Here, we record the behavioural responses of jellyfish Crambionella orsini Vanhöffen, 1888 (Family: Catostylidae) in captivity under conditions of acclimatization, feed types and light regimes. Acclimatization of jellyfish happened within two days following a dominant resting period and aggregation responses. Analysis of various stages of bell propulsions showed that swimming movements in scyphozoans are mediated by subsequent bell contractions and relaxations resulting in the formation of successive vortices that generates accelerative responses. Medusal preferences to live feeds (Artemia nauplii and copepods) were indicated with better consumption and swimming activities. Exposure of medusae to variable light intensities showed light-dependent swimming responses
highlighting the photoreceptor induced orientation and distribution patterns. Weaker pulsation rates and swimming movements under captivity and reduction in size in captivity demands, detailed studies on the aquarium adaptability of the species.