Richardus F. Kaswadji
Departemen Ilmu dan Teknologi Kelautan, FPIK Institut Pertanian Bogor, Bogor.

Published : 7 Documents
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PRODUKTIVITAS KOMUNITAS LAMUN DI PULAU BARRANGLOMPO MAKASSAR

Jurnal Akuatika Vol 3, No 2 (2012): Jurnal Akuatika
Publisher : Fakultas Perikanan dan Ilmu Kelautan

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Abstract

Lamun merupakan salah satu ekosistem penting di perairan pesisir dan laut dangkal karena mempunyai banyak peran, baik secara ekologis maupun secara ekonomis. Lamun merupakan produser primer pada struktur tingkatan trofik yang menghasilkan bahan organik melalui proses fotosintesis, dan menjadi salah satu kunci dari peran lamun. Oleh karena itu, dilakukan penelitian untuk menentukan besar produktivitas daun dan rhizoma lamun serta kontribusi masing-masing jenis lamun terhadap produktivitas.  Penelitian dilakukan di Pulau barranglompo Makassar.  Pengamatan produktivitas dilakukan dengan metode penandaan. Hasil penelitian menunjukkan bahwa produktivitas daun lamun berkisar antara 0.604-1.494 gC/m2/hari, sedangkan produktivitas rhizoma berkisar antara 0.013-0.050 gC/m2/hari. Jenis Enhalus acoroides, Thalassia hemprichii dan Cymodocea rotundata mempunyai kontribusi besar terhadap produktivitas lamun.  Kata kunci : lamun, produktivitas, dan pulau Barranglompo

Bioecology of Rotifera from Coastal Water and Estuary in North Sulawesi

Forum Pasca Sarjana Vol 31, No 1 (2008): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Abstract

The research aims to find out the existence and the most dominant rotifera in coastal territorial waters and estuaries in North Sulawesi, and their relationship with temperature, salinity, turbidity, dissolved oxygen, and nutrients.  The research was conducted in Manembo-nembo, Minanga, Wori, and Tumpaan.  Identification of rotifera revealed three species of rotifera from all locations, i.e. Brachionus rotundiformis, Brachionus caudatus, and Brachionus quadridentatus, with abundance value of 1984.4 ind/m3; 26.1 ind/m3; and 212.9 ind/m3 respectively.  Result of analysis indicates that abundance of those three rotifera are significantly different both between locations and sampling sites.  The  abundance of B. rotundiformis in Manembo-nembo and Minanga is higher compared to those in Wori and Tumpaan.  The abundance of B. caudatus is higher in Manembo-nembo and Minanga compared to those in Wori and Tumpaan.  The abundance of B. quadridentatus is also different from the other two species, the abundance is sifnificantly different in Minanga compared to those in Manembo-nembo and Tumpaan, but is not significantly different with those from Wori.  The highest abundance of B. rotundiformis was found in brackishwater pond and the lowest was in coastal area.   Key words: bioecology, rotifera, coastal water, estuary

Plancton Population Dynamics in Area Fishing Ground of Tiger Prawn Post Larvae and Milk Fish Fry on Coastal Water of Suppa Distric Pinrang Regency, South Sulawesi

Forum Pasca Sarjana Vol 32, No 2 (2009): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Abstract

This research to study relation between environment parameter, plankton abundance and primary productivity with abundance of tiger prawn post larvae and milk fish fry, calculates plankton predating rate speed by tiger prawn post larvae and milk fish fry and other larva and studies plankton population dynamics, tiger prawn post larvae and milk fish fry before, at the time and after peak season.  Result of research indicates that some environment parameters significant differs according to observation period and season.  Highest abundance of tiger prawn post larva, milk fish fry and other larva reaches to 29067, 7733 and 54400 ind/1000 m3. Highest grazing rate to population of phytoplankton and plankton (phytoplankton + zooplankton) found when predator consisted of tiger prawn post larva, milk fish fry and other larva with grazing rate up to 125 cells/liter/hour and 129 plankter /liter/hour respectively.  Highest predating rate to zooplankton population when predator consist of tiger prawn post larva and milk fish fry and there is phytoplankton as their prey up to 12 individual/liter/hour.  The certain plankton species significant correlation and estimated as natural food of tiger prawn post larva and milk fish fry that is some types of diatom and crustaceae from zooplankton.  Plankton population dynamics especially controlled by predator by tiger prawn post larva, milk fish fry and other larva, while influence of environment parameter is small relative. Abundance of each phytoplankton and zooplankton ranged from 583-28563 cells/liter and 22-3413 ind/liter.  Average abundance of phytoplankton and zooplankton significant differs higher at peak season compare  before and after tiger prawn post larva and milk fish fry season. Predator-prey relation between phytoplankton and zooplankton shows phase change which succession between phytoplankton controls to zooplankton phases with zooplankton control to phytoplankton.  Abundance of plankton influences abundance of population of tiger prawn post larva and milk fish fry especially after peak season.  There is concordance of time between peak abundance of tiger prawn post larva and milk fish fry and other larva with peak abundance of phytoplankton and zooplankton.   Key words : population dynamics, predating, predating rate, predator, prey, phytoplankton, zooplankton, tiger prawn post larva, milk fish fry, other larva, Pinrang

DISTRIBUSI SUMBERDAYA IKAN DEMERSAL DI PERAIRAN LAUT CINA SELATAN

Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Vol 11, No 2 (2004): Desember 2004
Publisher : Institut Pertanian Bogor

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Abstract

Tujuan penelitian ini adalah untuk mempelajari hubungan antara distribusi sumberdaya ikan demersal dengan kedalaman perairan dan faktor-faktor lingkungan perairan Laut Cina  Selatan. Penelitian ini dilakukan dari tanggal 10 September - 5 Oktober 2001 dengan kedalaman 13-72 meter. Hasil penelitian ini menunjukkan bahwa distribusi sumberdaya ikan demersal tergantung dari salinitas, kedalaman dan suhu perairan. Pengaruh faktor salinitas lebih besar dari faktor kedalaman dan suhu perairan. Distribusi Alepes kalla, Selaroides leptolepis, Scutor ruconeus, Leiognathus leusiscus, Pomadasys maculatus, Pomadasys argyreus, Pampus argenteus, Upeneus tragula dan Nemipterus mesoprion pada perairan dangkal dengan salinitas yang rendah serta suhu yang tinggi. Sebaliknya Nemipterus marginatus, Nemipterus peronii, Nemipterus tambuloides, Priacanthus macracanthus dan Upeneus bensasi pada perairan yang lebih dalam, salinitas yang tinggi dan pada suhu yang rendah. Distribusi Atropus atropus, Gazza minuta, Leiognatus equulus dan Scomberomorus commerson pada perairan dengan kecerahan yang tinggi. Scolopsis taeniopterus, Saurida undosquamis dan Priacanthus tayenus memiliki toleransi yang luas terhadap faktor lingkungan.Kata kunci: distribusi, ikan demersal, perairan Laut Cina Selatan.

DISTRIBUSI SUMBERDAYA IKAN DEMERSAL DI PERAIRAN LAUT CINA SELATAN

Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Vol 11, No 2 (2004): Desember 2004
Publisher : Institut Pertanian Bogor

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Abstract

Tujuan penelitian ini adalah untuk mempelajari hubungan antara distribusi sumberdaya ikan demersal dengan kedalaman perairan dan faktor-faktor lingkungan perairan Laut Cina  Selatan. Penelitian ini dilakukan dari tanggal 10 September - 5 Oktober 2001 dengan kedalaman 13-72 meter. Hasil penelitian ini menunjukkan bahwa distribusi sumberdaya ikan demersal tergantung dari salinitas, kedalaman dan suhu perairan. Pengaruh faktor salinitas lebih besar dari faktor kedalaman dan suhu perairan. Distribusi Alepes kalla, Selaroides leptolepis, Scutor ruconeus, Leiognathus leusiscus, Pomadasys maculatus, Pomadasys argyreus, Pampus argenteus, Upeneus tragula dan Nemipterus mesoprion pada perairan dangkal dengan salinitas yang rendah serta suhu yang tinggi. Sebaliknya Nemipterus marginatus, Nemipterus peronii, Nemipterus tambuloides, Priacanthus macracanthus dan Upeneus bensasi pada perairan yang lebih dalam, salinitas yang tinggi dan pada suhu yang rendah. Distribusi Atropus atropus, Gazza minuta, Leiognatus equulus dan Scomberomorus commerson pada perairan dengan kecerahan yang tinggi. Scolopsis taeniopterus, Saurida undosquamis dan Priacanthus tayenus memiliki toleransi yang luas terhadap faktor lingkungan.Kata kunci: distribusi, ikan demersal, perairan Laut Cina Selatan.

Biomass Nutrient Profiles of Marine Microalgae Dunaliella salina

Jurnal Penelitian Sains Vol 13, No 3 (2010)
Publisher : Faculty of Mathtmatics and Natural Sciences

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Abstract

The unconventional micro algal sources for the production of feed, food, food additive, pharmaceutical, and fine chemical is growing in important. Researches in the field are expanding worldwide. Nutritional composition of marine micro algae Dunaliella salina data included proximate composition, nitrate, RNA, and pigments were analyzed under various conditions in semi cultured medium. On average, nutritional composition of biomass was highly influenced by external irradiance and residence time in bioreactor. The biomass collected for short residence times was richer in protein.

Kebiasaan Makanan Ikan Beloso (Saurida undosquamis) di Perairan Laut Cina Selatan Bagian Selatan (LCS)

Majalah Ilmiah Biologi BIOSFERA: A Scientific Journal Vol 22, No 1 (2005)
Publisher : Fakultas Biologi | Universitas Jenderal Soedirman

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Abstract

The objective of this research is to understand the food habit of the lizard fish (Saurida undosquamis) in Southern South China Sea.For this purpose, purposive random sampling was conducted over 19 stations in trawlable bottom waters using swept area method and sample of 250 of S. undosquamis were examined for their stomach content. The lengths of S. undosquamis under this observation were 15,0-26,8 cm. The result showed that the S. undosquamis is demersal fish that distributed diurnally. The food habit of the S. undosquamis in South China Sea was different between the day and the night. The food habit of S. undosquamis in the day are mainly small demersal fishes, especially Leiognathus leusiscus and Upeneus sulphureus that have the same diurnal distribution pattern as  S. undosquamis. Meanwhile, during the night time, the food habit of  S. undosquamis was dominated by shrimps.