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Reproduction of Panulirus Longipes Longipes in Calatagan, Batangas, Philippines

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Histological analysis confirmed the resemblance of the ovarian structure and development of Panulirus longipes longipes to those of other palinurid species. The low incidence of inactive ovaries and the presence of developing ovaries at any time of the year indicate that this species breeds year round in Calatagan, Batangas, Philippines. Continuous breeding of the population is further ascertained by the incidence of egg-bearing females in the landed catch during practically all months from July 1982 to June 1984. Furthermore, the incidence of developing and redeveloping ovaries in egg-bearing females (44.0-81.2 mm CL) suggests that individuals can produce at least 2 broods in rapid succession particularly during the warmer months of March to May. The smallest females with eggs and mature ovaries were 41.8 and 41.4 mm CL size, respectively. The disproportionate increase in the growth of the third walking leg of the males relative to the females indicate that males reach first functional sexual maturity between 55.0-60.0 mm CL. The relationship between the total number of eggs (E) carried and the size of the female (CL) is expressed by the relationship: E = -291063 + 7387 CL over the size range 43.0-85.4 mm CL. Over this size range, the reproductive potential of P. longipes longipes is higher than that of closely related species belonging to the P. japonicus group.

Affiliations: 1: Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines

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