Spatial and Temporal Distribution of Blue Swimming Crab Larvae (Portunus pelagicus) in The Conservation Area of Betahwalang, Central Java

Redjeki, Sri; Zainuri, Muhammad; Widowati, Ita; Ghofar, Abdul; Agus, Elsa Lusia; Mustagfirin, Mustagfirin; Ayodya, Fabian Panji; Abbey, Michael

doi:10.14710/ik.ijms.25.4.173-178

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…Beberapa penelitian terkait rajungan P. pelagicus yang telah diinformasikan di Indonesia diantaranya kajian stok P. pelagicus (Suman et al, 2020), Preferensi habitat dan distribusi spasial juwana P. pelagicus (Hisam et al, 2020;Radifa et al, 2020), Distribusi spasial P. pelagicus (Redjeki et al, 2020), Aspek reproduksi P. pelagicus (Rasheed et al, 2020;Edi et al, 2018), informasi analisis morfometrik P. pelagicus ditemukan pada populasi perairan pulau jawa oleh Zairion et al, (2020); Safira et al, (2019); dan Mughni et al, (2022).…”

Section: Pendahuluanunclassified

Studi Morfometrik Kepiting Rajungan (Portunus Pelagicus)

Kalsum,

Dimenta

2023

BIOEDUSAINS

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This study aims to reveal the morphometric characteristics crab P. pelagicus in the Sei Berombang estuary waters. The purposive sampling method used to determining 3 sampling stations, sampling process was using trawl nets. The results showed that the P. pelagicus population at Station 1 dominated by small carapace, at stations 2 and 3 found the domination of larger size with juvenile and adult phases category. The morphometric characters of carapace width (CW) in blue/flower crabs ranged from 9.50 to 17.40 cm, left posterolateral carapace length (LPCL) ranged from 2.20-6.70 cm, left anterolateral carapace length (LACL) ranged from 1.30-6.50 cm, right anterolateral carapace length (RACL) ranged from 1.20-7.00 cm, frontal right width (FRMW) ranged from 1.50-3.70 cm, carapace length (CH) ranged from 3.70-7.00 cm, internal carapace width (ICW) ranged from 6, 30-14.10 cm, right orbit (eye socket) width (ROW) ranged from 1.06-2.00 cm, left orbit (eye cavity) width (LOW) ranged from 1.12-2.10 cm, carapace width (CW) ranged from 9.50-17.40 cm, left posterolateral carapace length (LPCL) ranged from 2.20-6.70 cm, and left anterolateral carapace length (LACL) ranged from 1.30-6.50 cm. Conclusion, The morphometric characters of male and female P. pelagicus in the Sei Berombang waters were found to vary spatially and temporally. Kata Kunci: Characteristic Morphology, Identification, Morphometric, P. pelagicus

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Section: Pendahuluanunclassified

Studi Morfometrik Kepiting Rajungan (Portunus Pelagicus)

Kalsum,

Dimenta

2023

BIOEDUSAINS

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“…The existence of mangroves in Keboromo Village is quite important, considering that the majority of people on the coast work as crab fishermen. According to Redjeki et al (2020), the existence of mangrove forests in coastal areas is an important ecosystem in the survival of the crab life cycle, especially in the larval and juvenile phases.…”

Section: Introductionmentioning

confidence: 99%

Vegetation Analysis as Indicator of Mangrove Degradation Level in Keboromo Village, Tayu

et al. 2023

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Mangrove degradation is one of the most common issues in the coastal areas of Java, which can cause ecological impacts and even disadvantage for local community. The mangrove forest degradation can be identified based on the vegetation analysis results, which could potentially contribute to the mangrove ecosystem management and rehabilitation programs in the coastal areas. Mangroves in Keboromo Village was the rehabilitation and cultivation area, but often get damaged by ocean waves. This study aims to determine the ecological and vegetation conditions of mangrove ecosystems consist of species composition, density, canopy cover, tree height, and environmental parameters were held in February 2023. The method used was direct observation using transect quadrants of 10x10 m2. The average mangrove density of all observation stations was 3.425 individuals/ha for the tree category, 575 individuals/ha for the sapling category, and 250 individuals/ha for the seedling category. The average percentage of canopy cover was 78.41%. The average height of mangrove trees at all stations is 4.15 m. The environmental parameters were still compatible with the water quality standard for biota and mangrove life. The mangrove forest degradation level based on standard criteria and guidelines for determining mangrove degradation is categorized as low, indicated by mangrove density >1500 individuals/ha and canopy cover >75%. Poor conditions were measured for sapling and seedling densities, which may be caused by environmental factors unsupportive for mangrove regeneration. Based on the results of mangrove vegetation analysis in Keboromo Village, it can state the mangrove ecosystem condition is good. However, management programs are needed to keep the mangroves sustainable.

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“…It is impossible to apply a single management strategy to all fisheries resources. Redjeki et al (2020a) assert that management must consider the stock of available resources to maintain a balance between resource use and conservation. According to Secor (2014), each population stock is often distinguished by particular biological characteristics.…”

Section: Introductionmentioning

confidence: 99%

Blue Swimming Crab’s Conservation Area Determination in The North of Java Sea Using Reproductive Indicator

Putri Novianingrum,

Hartati,

Pribadi

et al. 2023

Indo. J. Mar. Sci.

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Despite being operated on a small scale, Blue Swimming Crab (BSC), Portunus pelagicus fishery substantially contributes to Indonesia's fisheries as the country's third-largest export commodity after tuna and shrimp. The high of BSC’s demand led to pressure on its stock. Hence a conservation area is needed to be set up, in this study, was proposed using reproduction indicators. with the case study of BSC Stock in Keboromo Waters, Pati Regency, North Central Java. The samples were collected from 38 sampling points at a distance of 2-12 miles from the coastline during November-December 2022 using collapsible crab traps. A reproduction observation on female crabs was carried out on their carapace width and gonad maturity stage. The data then were analyzed for the percentage of egg-berried females (EBF), size at first maturity (Lm) and first captured (Lc), and their spawning potential Ratio (SPR). This study found that the mature crabs (GMS2) in November and December were higher than in other stages while the proportion of ovigerous females (EBF) in December was higher than in November. At several sampling points, the size at first captures (Lc) was higher than that at first maturity (Lm) indicating a decrease in resource stocks due to a delay in the recruitment process. SPR of 19% showed that reproductive potential should be maintained before recruitment is limited, therefore based on the existence of EBF in particular sampling points it is recommended three conservation areas as a temporary no-take zone in BSC fishing ground in Keboromo Watres, Pati Regency.

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Spatial and Temporal Distribution of Blue Swimming Crab Larvae (Portunus pelagicus) in The Conservation Area of Betahwalang, Central Java

Cited by 5 publications

References 10 publications

Studi Morfometrik Kepiting Rajungan (Portunus Pelagicus)

Studi Morfometrik Kepiting Rajungan (Portunus Pelagicus)

Vegetation Analysis as Indicator of Mangrove Degradation Level in Keboromo Village, Tayu

Blue Swimming Crab’s Conservation Area Determination in The North of Java Sea Using Reproductive Indicator

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