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Investigaciones marinas

versión On-line ISSN 0717-7178

Resumen

DUPRE M., Enrique  y  GUISADO A., Chita. Early stages of phyllosoma of the spiny lobster of Juan Fernandez (Jasus frontalis) mantained in laboratory conditions. Investig. mar. [online]. 1996, vol.24, pp.39-50. ISSN 0717-7178.  http://dx.doi.org/10.4067/S0717-71781996002400004.

The first stage after the larval eclosion corresponds to a naupliosome. It presents an ovoid body conformed by curved eyes, pereion and pleon and pereiopods that are wound on themselves. The antennula is the only extended appendage. It is provided with plumose setae which permit the swimming of the naupliosome until the moult takes place originating the first phyllosoma. The stage I of phyllosoma presents a transparent and flattened dorso-ventrally body. The eyes are non stalked. The stages I and II of phyllosoma have exopods with 6 pairs of plumose setae. The exopod of the third pereiopod is rudimentary and the fourth and fifth pairs of pereiopods are absent. In the stage II of phyllosoma the eye stalk appears: the first and second pairs of pereiopods bear 7 pairs of plumose setae on the exopodito, the fourth pair is rudimentary and the fifth is absent. The stage III of phyllosoma presents 8 pairs of plumose setae on the exopods of the first and second pereiopods and 3 setae in the third pair. The fourth pair is 1 to 1.5 times longer than the abdomen. Fifth pair is absent. The stage IV of phyllosoma presents two sub-stages: A and B. The sub-stage IV A has a fourth pereiopod 2 times longer than the abdomen and a third pereiopod with an exopod with 4 or 5 pairs of plumose setae. The sub-stage IV B has a fourth pereiopod 3.5 to 4 times longer than the abdomen and the exopod of the third pereiopod presents 5 pairs of plumose setae. The stage V of phyllosoma, the exopods of the first and second pairs of pereiopods present 10 pairs of setae. The exopod of the third pair of pereiopods presents 6 pairs of plumose setae. The fifth pair is rudimentary. The survival of larvae in each stage is variable and increases as the development advances. The minor survival occurred in the first stage of phyllosoma (17%) and the mayor survival (90,5%) was found in the stage V of phyllosoma. The total duration of the first 5 stages varied between 40 to 57 days and the duration average of each stage, in a range of temperature of 18-23ºC, were 13, 11, 6, 19.5 and 8 days respectively. The maximum duration of intermoul period of the larvae was 27 days. These results suggest that the larval development would have a duration between 112 to 160 days and a maximum time of 378 days at temperature between 18 and 23ºC.

Palabras clave : early stages; intermoult; stage duration.

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