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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Journal of Aquaculture Management and Technology Jurnal Kelautan Tropis Jurnal Riset Akuakultur Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi
Lestari Lakhsmi Widowati
Program Studi Budidaya Perairan, Jurusan Perikanan, Fakultas Perikanan Dan Ilmu Kelautan, Universitas Diponegoro
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Environmental Science Industrial & Manufacturing Engineering Other

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Profil Kelulushidupan dan Pertumbuhan Kerang Hijau (Perna viridis) pada Posisi Compound Structure yang Berbeda di Timbulsloko, Sayung, Demak Rahayu, Eka Puji; Hastuti, Sri; Widowati, Lestari Lakhsmi
Journal of Aquaculture Management and Technology Vol 13, No 1 (2024): Journal of Aquaculture Management and Technology
Publisher : Journal of Aquaculture Management and Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Compound structure merupakan sabuk pantai buatan dari bambu sebagai pemecah gelombang untuk mencegah abrasi pantai. Compound structure juga dapat dimanfaatkan sebagai tempat budidaya. Kerang hijau (Perna viridis) merupakan biota lunak (moluska) yang hidup sessil di laut. Budidaya kerang hijau hanya mengandalkan pakan alami. Perbedaan posisi mempengaruhi kelulushidupan dan pertumbuhan kerang hijau. Tujuan dari penelitian ini adalah mengetahui profil kelulushidupan dan pertumbuhan kerang hijau pada posisi Compound structure berbeda di Timbulsloko, sayung, Demak. Perlakuan berupa kelulushidupan dan pertumbuhan dengan variabel terikat perbedaan posisi. Sampel uji menggunakan 50 ekor spat/kantong dengan 6 kantong setiap lokasi selama 2 bulan. Pengumpulan data meliputi nilai kelulushidupan, pertumbuhan mutlak, pertumbuhan spesifik (SGR), serta kualitas daging. Hasil kelulushidupan kerang hijau CS A 100±0% lebih baik dibanding CS B dengan 72,33±19,82% akibat perbedaan salinitas dari arus dari muara sungai. SGR bobot dan panjang CS A dan CS B tidak berbeda nyata. SGR bobot CS A 1,53±0,23%/hari, CS B 1,40±0,24%/hari. SGR panjang CS A 0,49±0,13%/hari, CS B 0,36±0,10%/hari. Pertumbuhan tersebut disebabkan oleh klorofil-a yang mencukupi kebutuhan pakan dan C organik untuk pertumbuhan cangkang. Kualitas daging CS A 29,96±1,44% lebih tinggi dibanding CS B dengan 26,41±2,32% karena pengaruh N dan P dari sungai yang berpengaruh pada kandungan klorofil-a sebagai pakan kerang hijau.
Utilization of Locally Available Feeds to Develop Sustainable Blue Swimming Crab (Portunus pelagicus) Farming in Central Java Ariyati, Restiana Wisnu; Trienes, Yoni; Rejeki, Sri; Hutabarat, Johannes; Haeruddin, Haeruddin; Sarjito, Sarjito; Saputra, Suradi Wijaya; Widowati, Lestari Lakhsmi; Schrama, Johan; Bosma, Roel H.
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 4 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.4.433-444

Abstract

The popularity of the blue swimming crab (Portunus pelagicus) has led to significant overfishing. Aquaculture offers a potential solution to reduce fishing pressure, given that P. pelagicus is relatively easy to hatch, has high fecundity, a short larval duration, and rapid growth. However, knowledge about feed preferences and feed-use efficiency in P. pelagicus is limited. This study compared the effectiveness of three locally available feeds. A total of 160 juvenile P. pelagicus were divided into five repetitions across four diet groups: PPV (shrimp pellets + Perna viridis flesh, crude protein = 45 %), PAI (shrimp pellets + Acetes indicus, crude protein = 45 %), P100 (shrimp pellets, crude protein = 30%), and P150 (shrimp pellets at 150% of the dry matter requirement, crude protein = 45%, iso-protein to both PPV & PAI). The experiment consisted of three phases: a one-week pre-trial to determine feeding rates, followed by a six-week culture period (Period-1) and an eight-week culture period (Period-2). Body weight and survival were measured biweekly, feed amounts were adjusted accordingly, and costs were recorded. Survival rates and feed conversion ratios were similar across all diets. Crab growth was lower in Period-2 than in Period-1 across treatments. The specific growth rates for PPV, PAI, and P150 were comparable, while P100 resulted in lower growth. The cost of PPV was higher than that of PAI, P100, and P150, with the economic feed conversion ratio for P100 and P150 outperforming PPV and PAI. Shrimp pellets proved to be an efficient feed for the grow-out phase of blue swimming crabs, though pellet size should match the crab’s size.
Assessing the Impact of Substrate and Shelter on Cannibalism in Blue Swimming Crab (Portunus pelagicus) Ariyati, Restiana Wisnu; Caesa, Genio; Rejeki, Sri; Hutabarat, Johannes; Haeruddin, Haeruddin; Sarjito, Sarjito; Widowati, Lestari Lakhsmi; Bosma, Roel
Jurnal Kelautan Tropis Vol 27, No 3 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/potensi.%Y.24653

Abstract

Blue swimming crab (Portunus pelagicus) is one of Indonesia’s essential fishery commodities, but overfishing has depleted its population. Aquaculture, as an alternative to produce this crab, is hampered by high levels of cannibalism. Substrates or shelters can reduce cannibalism. This study compared the effectiveness of one substrate and two types of shelter for reducing cannibalism of P. pelagicus crablets. Crablets with average carapace length of 3.6 ± 2.2 cm and average weight of 6.4 ±1.5 g.ind-1 were stocked in 24 rectangular tarpaulin tanks with 1 m2 surface and 50 cm water depth. The stocking density was 8 crablets in each tank. A split-plot experimental design was applied with four main plots and two subplots with 3 replications. The main plot consisted of A0 (without shelter), A1 (seaweed), A2 (pipes), and A3 (seaweed and pipes), and sub-plots had either no-substrate (B0) or sand-substrate (B1). Cannibalism (K), survival (S), and four water quality parameters were recorded for 42 days. The data were analyzed using an ANOVA for a split-plot design and post-hoc Tukey. The results show that the sand substrate significantly (P>0.05) reduced cannibalism and increased survival of the P. pelagicus. Treatment A0B0, without substrate or shelter, showed the highest cannibalism (54±7%) and lowest survival rates (33±7%). While treatment A1B1, with Gracillaria sp. as shelter and sand as bottom-substrate resulted in the lowest cannibalism (4±7%) and highest survival rates (88±13%).
Growth of Gracilaria sp. in Monoculture and Polyculture System with Milkfish (Chanos chanos Forsk) in Traditional Ponds, Brebes Regency, Central Java Rahmawati, Vira Rizqi; Rejeki, Sri; Amalia, Rosa; Widowati, Lestari Lakhsmi; Ariyati, Restiana Wisnu; Nauta, Reinier; Lansbergen, Romi
Jurnal Kelautan Tropis Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i1.22236

Abstract

Gracilaria sp. has a high economic value, which can be cultivated in monoculture or polyculture with other cultivars, such as milkfish (Chanos chanos Forsk). Polyculture of Gracilaria sp. with milkfish can increase the growth of Gracilaria sp. because the metabolic products of milkfish are helpful as a source of nutrients for Gracilaria sp. This study aimed to (1) examine the effect of Gracilaria sp. cultivation in monoculture and polyculture with milkfish on the growth of Gracilaria sp. and (2) the nutrient content of the water. This study used an experimental method with two treatments and three replications using six (6) earth ponds: Gracilaria sp. monoculture and polyculture with milkfish. Growth and nutrient content (nitrate and phosphate) data were analyzed using a t-test. The results of the study showed that the growth of Gracilaria sp. polyculture with milkfish provided absolute growth of 3615.89 ± 330.84 g; Relative Growth Rate (RGR) 180.79 ± 16.54 %; and Specific Growth Rate (SGR) 2.29 ± 0.13 %/day were significantly higher, compared with the growth of Gracilaria sp. monoculture. Monoculture Gracilaria sp showed absolute growth of 1912.71 ± 386.94 g; RGR 95.64 ± 19.35 %; and SGR 1.48 ± 0.22 %.day-1. Nutrient content in polyculture pond waters revealed nitrate 1.08 ± 0.09 mg.L-1 and phosphate 0.18 ± 0.04 mg.L-1 were significantly higher compared to nutrient content in monoculture pond waters which were nitrate 0.71 ± 0.22 mg.L-1 and 0.07 ± 0.04 mg.L-1. Polyculture Gracilaria and seaweed provide higher production due to the enrichment from nutrient content. 
Analysis of Purchasing Desicion to Softbone Milkfish at Seller Center of Special Gift in Semarang City Wijayanto, Dian; Widowati, Lestari Lakhsmi
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 7, No 1 (2011): Jurnal Saintek Perikanan
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (117.239 KB) | DOI: 10.14710/ijfst.7.1.70-76

Abstract

At the present, people is more like a softbone milkfish. That is  push the growth of  the Pandanaran Area as the seller center of special gift from Semarang. Marketing research would be done to increase understanding of consumers characteristics and to develop business of softbone milkfish, including the factors that influenced a consumers to choose a store and to buy softbone  milkfish products. This research aims to assess the influence level of decisions factors to buy and  also to scan competition of softbone milkfish sellers  at  the Pandanaran Area in Semarang. The research proved that the image and positioning “Bandeng Juwana” is very high (the most popular) as special gift of Semarang. The most decision  factor which influenced a selection of stores was taste (28%), and then followed by texture (10%), colour (10%), price (8%), packaging (7%), and store image (7 %). “Bandeng Juwana” have strength on an aspects of physical product, especially in taste and price (reasonable price), while”Bandeng Presto” have strength on a service aspects and building design. “Bandeng Bonafid” has strength on   the speed of service. The results proved that “Bandeng Juwana” would become the first choice of consumers, both before and after the process of purchasing (repurchased order). Consumers choice index were 3.74 for “Bandeng Juwana”, 3.72 for “Bandeng Presto” and 3.35 for “Bandeng Bonafid”. Key words:softbone milkfish, consumers want index, consumers choice index
Co-Authors Amelia Rahmawati Ana Yuliyana Bosma, Roel Bosma, Roel H. Caesa, Genio Dewi Nurfebriani Nurfebriani Dian Wijayanto Haeruddin Haeruddin Ida Ayu Putu Sri Widnyani Indah Susilowati Johannes Hutabarat Lansbergen, Romi Muhamad Fikri Nauta, Reinier Pinandoyo Pinandoyo Pujiono W Purnomo rahayu, eka puji Rahmawati, Vira Rizqi Restiana W Ariyati Restiana Wisnu Ariyati Roel Bosma Rosa Amalia S Budi Prayitno Sarjito - Schrama, Johan Slamet Budi Prayitno Sri Rejeki Sri Rejeki Suradi Wijaya Saputra Tita Elfitasari Tri Winarni Agustini Trienes, Yoni Tristiana Yuniarti Widiana, Giacinta Risti Yogi Faisyal, Yogi Yundari, Yundari Yuni Wahyuningsih, Yuni