Abstract
Blue swimming crabs Portunus pelagicus occupied Tiworo Strait waters has been experiencing heavy pressure due to high exploitation and damaging its habitat caused by conversion to be a port or jetty particularly in the intertidal and subtidal zones closed to mangrove areas and river mouth. Those zones constitute main habitats of BSCs. The study aimed to analyze temporal sex ratio (SR), growth patterns and condition factor (CF) of BSCs in Tiworo Strait waters which was conducted in June–December 2018. The BSC samples were taken monthly using collapsible pot. Each sample taken was identified its sex, measured its CW and weighed its BW. Monthly SR of male and female was counted, while BW–CW relationship was analyzed using a simple linear regression. Growth patterns and CF were derived and analyzed from BW–CW regression. The results of study showed that monthly BSC SR of male and female showed females preponderated over males, except in November. The growth pattern of male and female was negative allometric (b 3). Data of BSCs CF were mostly influenced by growth coefficient (b), namely the higher b the lower CF. This condition is frequent happening in BSC population dominated by juvenile and mature stages. This study showed most BSCs found in this location were juvenile which indicated as their nursery ground in the intertidal zone dominated by sand substrate closed to mangrove forest.
Highlights
Blue swimming crabs (BSC), Portunus pelagicus “sensu stricto”, which previously was known as P. pelagicus “sensu lato” (Lai et al, 2010) constitute an organism inhabiting sea water which have width range distribution covering western Indo-Pacific from Japan waters, across Southeast (Philippines, Malaysia, Indonesia) and East Asia (Lai et al 2010) up to eastern Australia from Cape Naturaliste in Western Australia north to the Northern Territory, across Queensland, and down the east coast to the New South Wales – Victorian border (Johnston et al, 2012)
BSCs sex ratio (SR) of male and female caught in June – December in the sampling sites of Tiworo Strait showed female number generally preponderated over male number, except its number in September was equal and November where male preponderated over female (Table 1)
Information found from body weight (BW) – carapace width (CW) relationship of several organisms and BSCs have big significant into fisheries biology and have several application into several subject of BSC fisheries management
Summary
Blue swimming crabs (BSC), Portunus pelagicus “sensu stricto” (refers to the present revised concept of this species), which previously was known as P. pelagicus “sensu lato” (previous concept of this species as it considered to date) (Lai et al, 2010) constitute an organism inhabiting sea water which have width range distribution covering western Indo-Pacific from Japan waters, across Southeast (Philippines, Malaysia, Indonesia) and East Asia (Lai et al 2010) up to eastern Australia from Cape Naturaliste in Western Australia north to the Northern Territory, across Queensland, and down the east coast to the New South Wales – Victorian border (Johnston et al, 2012). In Southeast Sulawesi waters, this organism occupies all coastal zones, in the present this organism is dominant caught in Tiworo Strait waters and Lasongko Bay (Muskita et al, 2015; La Sara et al, 2017) This organism is included in the family of Portunidae which has premium price due to huge number of domestic and international people consumed as prestigious main stuff. This reason pushes fishermen catch it intensively in coastal waters at the water depth of 1 – 5 m up to sea water with water depth of > 30 m
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