Reproductive biology and size at onset of sexual maturity of the spiny lobster Panulirus homarus homarus (Linnaeus, 1758) in Khadiyapatnam, southwest coast of India

The size at first sexual maturity is described for females of the Scalloped spiny lobster Panulirus homarus homarus (Palinuridae) sampled from landings at Khadiyapatnam in Kanyakumari district of Tamilnadu, on the southwest coast of India, based on physiological and functional maturity indices. The size at 50% physiological maturity was estimated at 55.0 mm carapace length (CL), based on regression of percent of females with mature, maturing and spent - recovery ovary against carapace length. The smallest female with a mature ovary was 45.5 mm CL compared to the smallest female (46.5 mm CL) with external eggs. Logistic relationships between CL and percentage of females with external eggs (berried) and with ovigerous setae on endopod of pleopods indicated that 50% maturity was attained at 61.0 mm CL (berry method) and 54.0 mm CL (setal method), respectively. Size at maturity based upon appearance of well developed pairs of ‘windows’ on the last pair of sternal plates at the base of fifth pereiopods was estimated at 55.0 mm CL. The analyses show that the external secondary sexual characters may be useful as morphological measures of functional sexual maturity in the spiny lobster Panulirus homarus homarus from Indian waters, as these values are very close to the size at physiological maturity (55.0 mm CL) obtained based on the ovarian maturation. On the basis of this study, a minimum legal size (MLS) of 65.0 mm CL for fishing P. homarus homarus from Indian waters is recommended

Suitability of Killai backwaters for prawn farming-a preliminary micro level survey

Brackishwater areas have been given much importance for prawn farming. No information was available on the Killai backwaters about factors like water quality, topography, contour, extent of the area, tidal amplitude, seed potential and possibilities of flooding etc. Hence during 1982-'84 Klllai area was thoroughly surveyed on the above aspects and the results have been discussed in this paper. From this it is inferred that a total area of about 155 ha is readily available for undertaking both pond and pen culture in this backwater

Not Available

Not AvailableThe size at first sexual maturity is described for females of the Scalloped spiny lobster Panulirus homarus homarus (Palinuridae) sampled from landings at Khadiyapatnam in Kanyakumari district of Tamilnadu, on the southwest coast of India, based on physiological and functional maturity indices. The size at 50% physiological maturity was estimated at 55.0 mm carapace length (CL), based on regression of percent of females with mature, maturing and spent - recovery ovary against carapace length. The smallest female with a mature ovary was 45.5 mm CL compared to the smallest female (46.5 mm CL) with external eggs. Logistic relationships between CL and percentage of females with external eggs (berried) and with ovigerous setae on endopod of pleopods indicated that 50% maturity was attained at 61.0 mm CL (berry method) and 54.0 mm CL (setal method), respectively. Size at maturity based upon appearance of well developed pairs of ‘windows’ on the last pair of sternal plates at the base of fifth pereiopods was estimated at 55.0 mm CL. The analyses show that the external secondary sexual characters may be useful as morphological measures of functional sexual maturity in the spiny lobster Panulirus homarus homarus from Indian waters, as these values are very close to the size at physiological maturity (55.0 mm CL) obtained based on the ovarian maturation. On the basis of this study, a minimum legal size (MLS) of 65.0 mm CL for fishing P. homarus homarus from Indian waters is recommended.Not Availabl

Not Available

Not AvailableBrackishwater areas have been given much importance for prawn farming. No information was available on the Killai backwaters about factors like water quality, topography, contour, extent of the area, tidal amplitude, seed potential and possibilities of flooding etc. Hence during 1982-'84 Klllai area was thoroughly surveyed on the above aspects and the results have been discussed in this paper. From this it is inferred that a total area of about 155 ha is readily available for undertaking both pond and pen culture in this backwater.Not Availabl