DISTRIBUSI SPASIAL RAJUNGAN (PORTUNUS PELAGICUS) PADA MUSIM TIMUR DI PERAIRAN PULAU LANCANG, KEPULAUAN SERIBU
ABSTRACT: A study was carried
out to assess the present status of blue swimmer crab (Portunus pelagicus) in
Lancang Island, incorporating identification of fishing ground, also
measurement of environmental condition and crab biometry. Monthly catch assessment
was performed on JuneSeptember 2015 at three landing bases
using structured questionnaire and morphometric sampling of minimum randomly
selected 30 crabs. Bathymetric survey was conducted to produce depth-contoured
maps combined with certain oceanographic parameters (sea surface
temperature, salinity, water clarity, total suspended solids, dissolved oxygen,
and nitrate-NO3) measured at 15 sampling sites. A grid map was produced to
identify key areas of crab fishing grounds, recruitment habitat, and spawning
habitats. During southeast monsoon, main fishing ground was distributed in the
western and southern part of Lancang Island (grid C3, C4, and D5). In general,
crab yields were dominated by female (66.9%) and 43.8% of them were bearing
eggs. Four size classes were determined from frequency distribution of carapace
width (Class 1 = 7.0-10.6 cm; Class 2 = 10.7-14.2 cm; Class 3 = 14.3-17.8 cm;
and Class 4 = 17.9-21.5 cm), with Class 2 as the most prominent catch.
Referring to ontogenetic migration trait of the species, presumed recruitment
habitat for blue swimmer crab in Lancang Island is located at A6, where
abundant juveniles were harvested in the area with strong oceanic influence and
depth range of 24-30 m. Spatial coherence on the distribution of bearing egg
female with several environmental parameters (sea surface temperature,
salinity, and dissolved oxygen) indicates strong estuarine influence is
required for crab spawning habitat at C3 and
KEYWORDS: blue swimmer crab;
fishing ground; Lancang Island; southeast monsoon; spatial distribution
Penulis: Syamsul Bahri Agus,
Nimmi Zulbainarni, Adriani Sunuddin, Tarlan Subarno, Aditya Hikmat Nugraha,
Insaniah Rahimah, Andi Alamsyah, Rosdyani Rachmi, . Jihad
Kode Jurnal: jppertaniandd160545