Study of the laying cephalopod decapods on cultivated algae in the southwestern Madagascar
Raheriarilala Vatosoa Aratra
Halieutic Institute and Marine Sciences, Toliara University, Madagasca
: J Mar Biol Oceanogr
Abstract
A study on decapod cephalopod laying has been realized in the southwest region of Madagascar. It was carried out on Andrevo's algae cultivation ï¬Âeld from November 15, 2017 to February 06, 2018 followed by a laboratory study of gonad samples collected from COPEFRITO. Laying squid and cuttleï¬Âsh were found on the algae culture ï¬Âeld during the study, and 63% of respondents conï¬Ârmed the presence of the laying both two organisms from September to February. Concerning laying, the environmental conditions of the algae culture ï¬Âeld are favorable to the latter. Respectively for both organisms (squid and cuttleï¬Âsh), color (milky white, black ranging from transparent), shape (tubular, round), quantity of eggs on a laying (278, 21), weight of one egg-laying (775g, 16g), the weight of the egg (0.34g, 0.76g), the weight of the embryo (0.04g, 0.25g), the size of the egg (1.10cm, 1.57cm) and the size of the embryo (0.42cm, 1cm) are largely distinct in both. For squid, the characteristic is also depending on the species and the particularity encountered allows us to say that the laying observed belongs to the species Sepioteuthis sp. concerning the gonad; it correlates with the weight of the animal.
Biography
Raherialala Vatosoa Aratra has completed her peofessional license at the age 21 years from Halieutic Institute and Marine Sciences (IH.SM), Toliara University, Madagascar. She is a guide at Marine Museum RABESANDRATANA-Toliara and technician of Tilapia fry production of the COI-COUT project in Toliara/Madagascar. raheriarilala.vatosoa@gmail.com