Edrus, Isa Nagib
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THE CURRENT STATE OF ARTIFICIAL REEFS IN LEBAH COASTAL WATERS, KARANGASEM, BALI: AN EVALUATION ON THE COASTAL RESOURCE REHABILITATION PROJECT Edrus, Isa Nagib; Suprapto, Suprapto
Indonesian Fisheries Research Journal Vol 11, No 1 (2005): (June 2005)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (13703.247 KB) | DOI: 10.15578/ifrj.11.1.2005.19-40

Abstract

The study was conducted in May 2001 wlth aims to identifl and examine changes the biotic condition of coastal resources. The study used dual approaches of old and new data collections followed by statistical test of Wilcoxon Rank Sum Test.
CORAL FISH POPULATION CHANGES IN THE SURROUNDING ARTIFICIAL REEFS OF THE LEBAH COASTAL WATERS, KARANGASEM, BALI Syam, Amran Ronny; Edrus, Isa Nagib; Hartati, Sri Turni
Indonesian Fisheries Research Journal Vol 13, No 2 (2007): (December 2007)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (10355.869 KB) | DOI: 10.15578/ifrj.13.2.2007.101-116

Abstract

The Directorate General of Fisheries deployed some artificial reefs in 1991 for habitat enhancement in Lebah coastal waters that have already degraded. This study was the 4th time monitoring of fifteen years of restoration period that aimed to identify changes of coral fish population in the vicinity of the artificial reefs.
BIOLOGI REPRODUKSI, PERTUMBUHAN DAN MORTALITAS IKAN EKOR KUNING (Caesio cuning Bloch, 1791) DI PERAIRAN NATUNA Prihatiningsih, Prihatiningsih; Edrus, Isa Nagib; Sumiono, Bambang
BAWAL Widya Riset Perikanan Tangkap Vol 10, No 1 (2018): April (2018)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (411.235 KB) | DOI: 10.15578/bawal.10.1.2018.1-15

Abstract

Ikan ekor kuning (Caesio cuning) merupakan ikan ekonomis penting dan mendominasi hasil tangkapan bubu di perairan Natuna. Pada saat ini, produksinya merupakan dominan ke-2 setelah ikan bawal putih yaitu 2.891 ton/tahun (17,8% dari total produksi ikan). Populasi ikan ekor kuning sejak tahun 2008 menurun, diduga karena tingkat eksploitasi yang cenderung meningkat. Penelitian ini bertujuan mengkaji aspek biologi, meliputi reproduksi, pertumbuhan dan mortalitas ikan ekor kuning. Contoh ikan sebanyak 2.627 ekor dikumpulkan melalui tempat pendaratan ikan utama di Kijang, Pulau Bintan (Kepulauan Riau) dan Tanjung Pandan (Kepulauan Bangka Belitung) pada bulan Januari - Nopember 2014. Hasil penelitian menunjukkan sebaran ukuran panjang ikan ekor kuning berkisar antara 9,3-43,3 cmTL. Ikan yang tertangkap didominasi oleh belum matang gonad (immature). Musim pemijahannya berlangsung pada bulan Juni-Juli dan September-Oktober. Fekunditas telur yang matang gonad berkisar antara 13.355-151.632 butir. Panjang pertama kali ikan ekor kuning tertangkap dengan bubu adalah lebih kecil dari panjang pertama kali matang gonad (Lc<Lm), sehingga akan mengancam kelestariannya. Analisis pertumbuhan dengan uji-t diperoleh pertambahan panjang secepat pertambahan beratnya (isometrik). Aplikasi model analitik menggunakan program Electronic LEngth Frequency ANalysis-I (ELEFAN-I) diperoleh parameter pertumbuhan (=K) sebesar 0,6/tahun, panjang asimtotis (=L∞) sebesar 43,21 cmFL dan umur hipotesis ikan pada saat panjang sama dengan nol (=to) sebesar -0,24 tahun, sehingga persamaan pertumbuhan Von Bertalanffy sebagai Lt = 43,21 (1–e-0,6(t-0,24)). Parameter mortalitas menunjukkan laju kematian alami (=M) sebesar 1,17/tahun, laju kematian karena penangkapan (=F) sebesar 1,21/tahun dan laju kematian total (=Z) sebesar 2,38/tahun. Berdasarkan nilai F dan Z tersebut maka diperoleh estimasi laju eksploitasi (exploitation rate) sebesar 0,58 atau dalam kondisi sudah melampaui nilai optimum (E=0,5), sehingga pengelolaannya perlu segera dilakukan agar potensi lestarinya terjaga.The yellowtail fusilier (Caesio cuning) is one of the economically important fish caught by trap nets in the Natuna waters. The production of the yellowtail fusilier in Bintan regency was a second dominant fish species after white pomfret by 2.891 tons/year (17.8% of total landed). Population of the yellowtail fusiliers is tend to decrease since 2008 due to an increase of fishing pressure to this species. This study aims to assess the biological aspects such as reproduction, growth and mortality of the yellowtail fusiliers. Monthly length frequencies data of 2.627 individual was collected through main landing place in Kijang, Bintan Island (Riau islands) and Tanjung Pandan (Bangka Belitung Islands) within January - November 2014. The results showed that the length distribution of the yellowtail fusilier ranged between 9.3 - 43.3 cmTL. The fish caught was dominated by the immature stage. The spawning seasons possibly occurred between June-July and September-October. Fecundity of mature fish ranged between 13.355-151.632 eggs. The length of first capture by trap nets was under the length at first mature (Lc<Lm), and threaten its sustainability. Based on t-test it is showed that the weight growth pattern as fast as length growth (isometric). Electronic LEngth Frequency ANalisys-I (ELEFAN-I) used, showed that the growth parameter (K) was 0.6/yr, asymtotic length (L∞) was 43.21 cmFL, and age at zero length (to) was -0.24 yr, so the Von Bertalanffy’s equation growth curve were Lt = 43.21 (1–e-0,6(t-0,24)). Mortality parameters showed the natural mortality rate (M) was 1.17/yr, fishing mortality rate (F) was 1.21/yr, and total mortality rate (Z) was 2.38/yr. Based on the values of F and Z obtained exploitation rate of 0.58 was likely exceed the optimum level (E=0.50) so that, management measures to maintain its potential yield should be applied. 
KOMPOSISI JENIS,KEPADATANDANKEANEKARAGAMAN JUVENILIKANPADAPADANGLAMUNGUGUS PULAUPARI Edrus, Isa Nagib; Hartati, Sri Turni
BAWAL Widya Riset Perikanan Tangkap Vol 5, No 1 (2013): (April 2013)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4910.533 KB) | DOI: 10.15578/bawal.5.1.2013.9-22

Abstract

Penelitian tentang juvenil di padang lamun Pulau Pari pada bulan Juni 2009 bertujuan untukmengetahui komposisi jenis, kepadatan dan keanekaragaman juvenil ikan. Sampling dilakukan pada siang hari dengan menggunakan jaring arad. Hasil penelitian menunjukkan bahwa jenis ikan yang tertangkap terdiri dari 55 jenis yang berasal dari 42 marga dan 23 suku. Sebanyak 52 jenis (98%) tergolong juvenil. Ikan dengan status penghuni tetap sebanyak 31 jenis, musiman 11 jenis, dan penghuni tidak tetap 14 jenis. Kelompok ikanmajor terdapat 34 jenis, kelompok ikan target 20 jenis dan kelompok ikan indikator 2 jenis. Kepadatan antar lokasi berkisar antara 0,05 - 0,34 indivdu/m2 dengan ratarata 0,2 individu/m2 atau setara dengan 2.000 ekor per ha. Indeks keanekaragaman (H) berkisar antara 1,3 - 2,7. Jenis jenis yang mendominasi hasil tangkapan antara lain adalah Apogon margaritophorus, A.ceramensis, Acreichthys tomentosus, Halichoeres argus, Lethrinus harax, Papilloculiceps longiceps dan Cheilodepterus quinquelineatus. Tidak terdapat korelasi antara habitat (substrat, jenis, tutupan serta jumlah tegakan lamun/m2) terhadap pola keanekaragaman juvenil ikan. Oleh karena itu perlu sampling yang lebih intensif (siang dan malamhari, saat pasang dan surut), dan sampling di pulau-pulau lainnya yang terdapat di Kepulauan Seribu.This study conducted in the seagrass beds of Pari Islands in June 2009. The aims are to assess the fish juvenile resources in terms of species diversity, stocks, composition, predominant, and group status. Data were collected using an arad net for juvenile. A total of 56 species of fish juveniles belong to 42 genus and 24 families were collected from seagrass bed of Pari Island. Those were consisted of 52 species (98%) that classified as juveniles. Among of them (31 species) were resident fishes that use seagrass in their whole live, 11 species of seasonal/traveller fishes, and 14 species of non-resident fishes. From the total 55 species of fish samples, there were 34 species belonging to target fishes, 20 species were major fishes, and 2 species were indicator fishes. The fish density ranged from 0.05 to 0.34 indivdual/m2 with an average of 0.2 individual/m2 or equivalen to 2.000 fishes per hectare. Diversity indeces (H) ranged from 1.3 to 2.7. Predominant species that prefer seagrass bed as their permanent resident habitat were Apogon margaritophorus, Apogon ceramensis, Acreichthys tomentosus, Halichoeres argus, Lethrinus harax, Papilloculiceps longiceps, and Cheilodepterus quinquelineatus. There are no relationship between habitat (substrates, seagrass species, percentage of cover, density of stems/number of stem/m2) and the diversity of fish juvenile pattern. Therefore, more intensive sampling must be done such as in the day and night time, in the high and low tide condition as well as sampling in other islands within the Seribu Islands.
PERIKANANDANASPEKBIOLOGI IKANPARI LAMPENGAN, Mobula japanica DI PERAIRANSELATAN JAWA Dharmadi, Dharmadi; Sunarno, Mas Tri Djoko; Edrus, Isa Nagib
BAWAL Widya Riset Perikanan Tangkap Vol 3, No 6 (2011): (Desember 2011)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.055 KB) | DOI: 10.15578/bawal.3.6.2011.369-376

Abstract

Ikan pari merupakan salah satu jenis ikan yang banyak didaratkan berasal dari Selatan Jawa. Salah satu jenis ikanpari yang belum banyak dilakukan penelitian adalah ikan pari lampengan (Mobula japanica). Tujuan penelitian ini adalah untuk mengetahui tentang perikanan dan aspek biologi jenis ikan tersebut di perairan Selatan Jawa sebagai informasi dasar bagi penentuan kebijakan pengelolaan perikanan Elasmobranchii. Penelitian menggunakan metode survei yang berlangsung dari Januari hingga Desember 2010 di Pelabuhan Perikanan Samudera Cilacap-Jawa Tengah. Sejumlah 165 ikan pari yang tertangkap oleh jaring insang diamati tingkat kematangan seksual, tingkat kematangan gonad, jenis kelamin dan ukuran lebar cawannya.Wawancara dilakukan terhadap para nelayan dan nahkoda kapal yang menangkap ikan pari lampengen tersebut secara langsung dan atau oleh enumerator. Hasil penelitian menunjukkan bahwa tangkapan per satuan usaha (CPUE) ikan pari lampengan bervariasi, yakni tertinggi pada bulan Juli (22,6 kg/ hari) dan terendah pada bulan Oktober (6,6 kg/hari). Frekuensi lebar tubuh ikan pari lempengen terendah terdapat pada ukuran antara 100-140 cmdenganmodus 120 cmyang termasuk kelompokmuda, sedangkan ukuran antara 150- 200 cm dengan modus 170 cm, termasuk kelompok dewasa. Frekuensi lebar tubuh tertinggi terdapat pada ukuran antara 200-260 cmdenganmodus 230 cm. Ikan pari lempengen sedikitnya terdiri atas 3 kelompok umur dengan modus sebaran lebar tubuh masing-masing 120, 170, dan 230 cm. Hubungan lebar tubuh (y) dan panjang klasper (x)mengikuti persamaan y=0,3784e0,0131x (r2=0,85), semakin bertambah lebar tubuh semakin bertambah panjang klaspernya.Perbandingan kelamin jantan dan betina adalah tidak seimbang (1,5:1). Sebagian besar kelompok umur ikan pari lampengan yang tertangkap tergolong usia muda, yang belummencapai pertumbuhan optimum(growth over fishing). Stingray is one of the species of fish that many landed came from the South of Java. One of the species that have not many research is JapaneseDevilray (Mobula japanica). The purpose of this study was to determine fisheries and biological aspects of Japanese Devilray, Mobula japanica in Indian Ocean as basic information for managing the elasmobranches fisheries. This study was conducted from January to December 2010 in the Ocean Fishing Port of Cilacap, Central Java. A total number of 165 individu of M. japanica caught by seine net and tuna longline were observed during the sampling periods. Body wide, sex, and gonadmaturation of those fishes were analyzed. Interviewswere also done to the fisherman and fishing master. The results showed that the body width of stingrays, M. japanica had the lowest frequency between 100-140 cm with mode of 120 cm,and grouped as young fish.Other groups has body width between 150-200 cm with mode 170 cm, and grouped as adult fishes. While the frequency of the highest body width was between 200-260 cm and 230 cmmode. At least, there were 3 cohorts ofM. japanica found in this study with the body width mode of 120, 170 and 230 cm. Exponential relationship between body width (y) and claspers’ length (x) was observed forM. japanica, that expressed by equation: y=0.3784e 0.0131x (r2=0.85), that mean the more width fish body, the more increase claspers’ length. Unbalance sex ratio of 1.5:1 was observed for this fish. CPUE for M. japanica were varied between 6,6 kg/day during October and 22,6 kg/day 0n July. Most of fish caught were young fishes under their maturity stages that indicated a tendency of growth over fishing.
ASPEK BIOLOGI REPRODUKSI IKAN TERBANG Cypsilurus spilopterus DI PERAIRAN TUAL, MALUKU TENGGARA Syam, Amran Ronny; Zubaidi, Thohir; Edrus, Isa Nagib
Jurnal Penelitian Perikanan Indonesia Vol 10, No 4 (2004): (Vol. 10 No. 4 2004)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jppi.10.4.2004.87-95

Abstract

Penelitian beberapa aspek biologi reproduksi dari dua jenis ikan terbang (C. Otigolepis dan C. Sgilogerus) telah dilakukan pada bulan Agustus 1994 di Perairan Tual, Maluku Tenggara. kedua jenis ikan terbang ditangkap oleh nelayan setempat dengan menggunakan jaring insang hanyut lmata laring U inci). Ukuranikan rata-rata pertama kali matang gonad pada ikan betina Cypsilurus oligolepis aaaian iZ,gO cm dan pada ikan betina-Cypsllurus spilopterus adalah 28,48 cm.
STRUKTUR KOMUNITAS IKAN KARANG DI PERAIRAN KABUPATEN MALUKU BARAT DAYA Arief, Syahrul; Edrus, Isa Nagib
Jurnal Penelitian Perikanan Indonesia Vol 16, No 3 (2010): (September 2010)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jppi.16.3.2010.235-250

Abstract

Pulau terpencil di wilayah Maluku Barat Daya telah mendapat perhatian pemerintah dalam kaitannya dengan pengumpulan informasi sumber daya pesisir. Penelitian ini dilakukan pada Pulau Leti, Moa, Lakor, Metimialam, dan Metimiarang. Tujuan penelitian ini adalah untuk mendapatkan data dan informasi struktur komunitas ikan karang. Metode yang digunakan dalam pengumpulan data dan informasi adalah sensus visual dalam transek sabuk seluas 250 m2. Hasil penelitian pada 21 lokasi pencuplikan data menunjukan bahwa sedikitnya terdapat 309 jenis ikan karang dari 45 suku. Indeks kekayaan jenis berkisar pada nilai 8-18. Indeks keanekaragam komunitas ikan karang berkisar pada nilai tiga. Indeks dominansi di bawah 0,10. Kepadatan ikan per meter persegi di bawah 10 individu dan ini tergolong rendah pada sebagian besar lokasi transek. Kelompok ikan mayor mendominansi komunitas ikan karang. Remote islands in South East Maluku get a government concern in terms of gathering coastal resource information. This study was caried out in the adjacent waters of Leti, Moa, Lakor, Metimialam, and metimiarang Islands. This study objectives were to obtain data and information about community structure of coral fishes. Methods used for those were census visual in belt transect with 250 m2 in area. For the 21 data gathering sites, the results showed that at least there were 309 spesies derived from 45 families identified for reef fish. Richness index of fish spesies ranged from 8-18. Diversity indices of the community were around of 3 level. Dominant indices below 0.10. Fish density per square meter was less than ten individuals and those are rare for majority of the transect areas.Mayor-fish group dominated the communities.
JENIS-JENIS DAN KEPADATAN IKAN KARANG DI PULAU PENATA BESAR, LEMUKUTAN, DAN PULAU KABUNG, PERAIRAN KALIMANTAN BARAT Edrus, Isa Nagib; Siswantoro, Yudi; Suprihanto, Imam
Jurnal Penelitian Perikanan Indonesia Vol 13, No 1 (2007): (April 2007)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jppi.13.1.2007.21-34

Abstract

Penelitian yang dilakukan pada bulan Juni 2004 ini bertujuan untuk mendapatkan data dan informasi ikanikan yang hidup dan berasosiasi dengan karang serta memprediksi faktor-faktor penghambat yang mempengaruhi keberadaan di wilayah perairan pulau-pulau kecil di Kalimantan Barat.Metode yang digunakan adalah sensus visual pada transek garis. Hasil penelitian menunjukkan bahwa jumlah jenis ikan karang berkisar antara 36 sampai dengan 51 jenis dengan kepadatan antara 10 sampai dengan 15 individu per m2. Rata-rata untuk Indeks keanekaragaman jenis (H), Indeks Dominasi (D), Indeks Keseimbangan (E), dan Irian Jaya Reef Diversity Index masing-masing 2,7; 0,1; 0,7; dan 4,5. Persentase ikan kelompok mayor rata-rata 66%, kelompok ikan target 19%, dan kelompok ikan indikator 15%. Sedangkan rata-rata persentase penggolongan ikan berdasarkan pada nilai ekonomi 66% ikan ekonomis rendah, 17% ikan ekonomis sedang, dan 17% ikan ekonomis tinggi. Faktor pembatas distribusi ikan adalah kekeruhan air yang cukup tinggi yang disebabkan oleh sedimen dari daratan. A study conducted in June 2004 aims to obtain data and information of fish living on and associating to coral reefs, and also to assume limitting factors for fish distribution. A sampling method used was visual census on a transect line. The result shows that the number of coral fish ranged from 36 to 51 species. The density of coral fish ranged from 10 to 15 indivdual per m2. The means of Diversity Indeces (H), Dominance Indeces (D), Eveness Indeces, and Irian Jaya Reef Diversity Index indeces were 2.7; 0.1; 0.7; and 4.5, respectively. The percentages of a major fish group, a target fish group, and an indicator fish group were average of 66, 19, and 15%, respectively. The mean percentages of marketable based fish groups consisted of 66% of low valuable fishes, 17% of fair valuable fishes, and 17% of high valuable fishes. The low level of body water transfarancy due to upland sediment was a limitting factor for the attendance of coral fish in the coral reef area of study sites.
DIVERSITY OF REEF FISH FUNGSIONAL GROUPS IN TERMS OF CORAL REEF RESILIENCES edrus, Isa Nagib; Abrar, Muhammad Abrar
Indonesian Fisheries Research Journal Vol 22, No 2 (2016): (December, 2016)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (27.98 KB) | DOI: 10.15578/ifrj.22.2.2016.109-122

Abstract

Infrastructure development in the particular sites of  Seribu Islands as well as those in main land of Jakarta City increased with coastal population this phenomenon is likely to increase the effects to the adjacent coral waters of Seribu Islands.  Chemical pollutants, sedimentation, and domestic wastes are the common impact and threatening, the survival of coral reef ecosystem. Coral reef resiliences naturaly remained on their processes under many influences of supporting factors. One of the major factor is the role of reef fish functional groups on controling algae growth to recolonize coral juveniles. The  aim of this study to obtain data of a herbivory and other fish functional groups of reef fishes in the Pari Islands that are resilience indicators, or that may indicate the effectiveness of management actions. A conventional scientific approach on fish diversity and abundance data gathering was conducted by the underwater visual cencus. Diversity values of the reef fish functional groups, such as the abundance of individual fish including species, were collected and tabulated by classes and weighted as a baseline to understand the resilience of coral reed based on Obura and Grimsditch (2009) techniques. The results succesfully identified several fish functional groups such as harbivores (21 species), carnivores (13 species) and fish indicator (5 species) occurred in the area. Regarding the aspects of fish density and its diversity, especially herbivorous fish functional group, were presumably in the state of rarely available to support the coral reef resiliences. Resilience indices ranged from 1 (low level) to 3 (moderate level) and averages of the quality levels ranged from 227 to 674. These levels were inadequate to support coral reef recolonization.
SEBARAN IKAN HIAS SUKU CHAETODONTIDAE DI PERAIRAN KARANG PULAU AMBON DAN PERANANNYA DALAM PENENTUAN KONDISI TERUMBU KARANG Edrus, Isa Nagib; Syam, Amran Ronny
Jurnal Penelitian Perikanan Indonesia Vol 4, No 3 (1998): (Vol.4 No.3 1998)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jppi.4.3.1998.1-10

Abstract

Penelitian sebaran ikan hias jenis Chaetodontidae sehubungan dengan kualitas terumbu karang telah dilakukan pada 10 lokasi di pantai utara Pulau Ambon dari bulan Juni sampai Juli 1994. Metode yang digunakan untuk penelitian keanekaragaman Chaetodontidae dan persen penutupan karang adalah sensus visual, survai manta tow dan line intercept transect.