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Fishes 2017, 2(4), 21; https://doi.org/10.3390/fishes2040021

Preliminary Results on Light Conditions Manipulation in Octopus vulgaris (Cuvier, 1797) Paralarval Rearing

1
Centro Oceanográfico de Canarias, IEO, Vía Espaldón, Dársena Pesquera, Parcela 8, 38180 Santa Cruz de Tenerife, Spain
2
CCMAR, Centro de Ciências do Mar, Universidade do Algarve, 8005-139 Faro, Portugal
3
Universidad de La Laguna, Faculty of Sciences, Biology Section, 38206 San Cristóbal de La Laguna, Spain
4
BIOMIN Holding GmbH, Erber Campus 1, 3131 Getzersdorf, Austria
5
Fisheries College, Ocean University of China, Qingdao 266003, China
6
AZTI, Txatxarramendi Ugartea z/g, 48395 Sukarrieta (Bizkaia), Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Maria Angeles Esteban
Received: 18 September 2017 / Revised: 16 November 2017 / Accepted: 20 November 2017 / Published: 24 November 2017
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Abstract

High paralarvae mortality is a major bottleneck currently hindering the control over the lifecycle of common octopus (Octopus vulgaris Cuvier, 1797). It is believed that this problem might be related to either zoo-technical and/or nutritional aspects. The present paper is focused on the study of different zoo-technical aspects related to light conditions on the rearing of paralarvae, including the effects of polarization in prey ingestion, the use of a blue filter to simulate natural conditions, and the use of focused light to avoid reflections of the rearing tank’s walls. In the first experiment, O. vulgaris paralarvae ingestion of Artemia sp. and copepods (Tisbe sp.) was assessed under either normal or polarized light. In the second experiment, the effect of a blue filter with natural light or focused artificial light on growth and mortality was assessed over 15 days of rearing. Ingestion rate was not influenced by light polarization. Nonetheless, a significantly higher ingestion of Artemia sp. with respect to copepods was observed. The blue filter promoted the use of natural light conditions in Octopus paralarval culture, while focused light reduced the collision of the paralarvae against the walls. However, no significant differences were found in paralarval growth nor survival. View Full-Text
Keywords: blue filter; Octopus vulgaris; paralarvae rearing; polarized light; reflection light blue filter; Octopus vulgaris; paralarvae rearing; polarized light; reflection light
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Garrido, D.; Reis, D.B.; Orol, D.; Gonçalves, R.A.; Martín, M.V.; Sykes, A.V.; Rodríguez, C.; Felipe, B.C.; Zheng, X.; Lagos, L.; Almansa, E. Preliminary Results on Light Conditions Manipulation in Octopus vulgaris (Cuvier, 1797) Paralarval Rearing. Fishes 2017, 2, 21.

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