Ceballos Vázquez, B.P., M., Contreras-Olguín, J.C., Beltrán-Murillo, L.G., Flores-Montijo, M.G., Martínez-Morales, S., López-López, H., Nolasco-Soria & D., Tovar-Ramírez (2024). Experiences on captive breeding of the pacific pygmy octopus Paroctopus digueti . Aqua 2024. Dinamarca, agosto 26 - 30, 2024, 193.
Bertha Patricia Ceballos Vázquez 1, Mauricio Contreras-Olguín 1, Juan C. Beltrán-Murillo, Laura Guadalupe Flores-Montijo 1, María G. Martínez-Morales, Silverio López-López 1, Hector Nolasco-Soria y Dariel Tovar-Ramírez
Paroctopus digueti (Perrier & Rochebrune, 1894) is a good candidateto keep in the laboratory to develop the culture as a research model, with arelative fast growth, direct development, a short life cycle and it is feasibleadapt it to live in captivity (DeRusha et al., 1987, Jereb et al., 2016,García-Flores, 2017). However, it is important to develop the appropriateconditions for their breeding, considering their habitat and behavior. The present study evaluated different culture conditions with open or recirculatingwater flow; individual or in group maintenance of juvenile, and using differenttypes of food, that included live and inert diets.
Adult females with "clutches" insideempty shells of Anadara multicostata were collected at Ensenada de LaPaz, B.C.S., México (24°06'N-24°48'N-110°44'W). They were placed in a 140 Ltank, placing each female inside a 500 µm mesh container during the incubationperiod. After hatching, juveniles were kept as a group for 30 days in tankswith shelters made of bivalve shells, in an open water flow system, at 28±1°C andfed with live Artemia or Mysidaceans or both (Fig. 1).
Thirty-day-old juveniles (0.33 g ± 0.15 SD)were kept in ponds with open and constant flow of seawater, with shells asshelter, inert fresh food (crab, shrimp, and clam), and daily cleaning.
Two treatments were implemented, one withjuveniles in groups and the other keeping them individually in 500µm mesh jars.Growth was evaluated in terms of weight gain at the end of experiment.
As can be seen in Table 1, when octopuses werekept in groups, they showed higher weight gain. However, survival was muchhigher when kept individually.
Mortality in the group treatment was mainly dueto cannibalism, which may explain the higher weight gain. By keeping themindividually, cannibalism was avoided; however, in this case it was difficultto maintain good water quality inside the containers where bacteria andprotozoos proliferated.
We concluded the necessity to improve the waterquality inside the individual containers and supplementing more shelters andfood in the group treatment to obtain better results.
Palabras clave: Octopus; Aquaculture; Growth
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