Sadiyah, Lilis
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CATCH AND EFFORT INFORMATION FOR ALBACORE TUNA (THUNNUS ALALUNGA) BY INDONESIA’S LONGLINERS OPERATING FROM BENOA Sadiyah, Lilis; Nugraha, Budi; Widodo, Agustinus Anung
Indonesian Fisheries Research Journal Vol 19, No 1 (2013): (June 2013)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3103.094 KB) | DOI: 10.15578/ifrj.19.1.2013.33-38

Abstract

Albacore (Thunnus alalunga - ALB) catch was the second highest tuna landed at Benoa Fishing Port and they are mostly landed as frozen bycatch. This paper attempts to provide information on ALB catch and effort trends by Benoa based longline vessels collected by the Benoa Port-based Catch Monitoring and Scientific Observer Programs. The ALB catch landed at the Benoa Fishing Port in 2010 was estimated by the Research Institute for Tuna Fisheries (RITF) to be about 983.14 tons, whereas based on the Indonesian Tuna Long Line Association (ATLI), ALB catch landed at Benoa Fishing Port in 2010 amounted of 2,715.42 tons. This discrepancy was due to sampling for frozen catch (including ALB) could not be conducted in some companies and also there was one company that sell their catch direct to the collector. The observed longline sets were concentrated within the area between 10° - 20°S and 105° - 120°E. Since 2008, the observed setting positions have never extended to south of 20°S. The higher catch rates of ALB were in area south of 15°S.
COST-EFFECTIVE APPROACH TO ESTIMATE UNREPORTED DATA: REBUILDING HISTORY OF LIFT-NET FISHING IN KWANDANG WATERS Prasetyo, Andhika Prima; Nugroho, Duto; Sadiyah, Lilis; Purwoko, Rudy Masuswo; Faizah, Ria; Setyawan, Agus
Indonesian Fisheries Research Journal Vol 20, No 2 (2014): (December 2014)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (444.134 KB) | DOI: 10.15578/ifrj.20.2.2014.99-106

Abstract

This paper aims to develop cost-effective approach regarding the estimation unreported annual catch data of lift-net fishery using Google Earth imagery. Lift net fishery is one of the main fishing activities of coastal community in Kwandang Bay, it has been faced problem of uncertain fisheries status due to limited recorded data. Combination of a Monte Carlo procedure was applied by involving couple of assumptions on parameters such as estimate growth rate of the total number of lift-net per years (10%), day at sea per unit per month (21 days) and operated lift-net per month (50% and 80%). The results showed that 101 units of lift-nets were found around Kwandang waters based on Google Earth imagery recorded in October, 7th 2010, and this were used as a benchmark of calculation. This prediction was 28 units higher than official data from North Gorontalo District of Marine Affairs and Fisheries Services (DKP Gorontalo Utara). Compared with capture fisheries statistics issued by Kwandang CFP, the estimated lift-net catches based on two-scenarios represent additional catches of 46 % and 86 %. These results suggested and could be used as a correction index to improve the reliability of Kwandang District officially reported fisheries statistics as a baseline to develop a local common fisheries policy.
CHANGES IN FISHING PATTERN FROM SURFACE TO DEEP LONGLINE FISHING BY THE INDONESIAN VESSELS OPERATING IN THE INDIAN OCEAN Sadiyah, Lilis; Dowling, Natalie; Prisantoso, Budi Iskandar
Indonesian Fisheries Research Journal Vol 17, No 2 (2011): (December, 2011)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (276.494 KB) | DOI: 10.15578/ifrj.17.2.2011.87-99

Abstract

(P.T. Perikanan Samodra Besar) data are a valuable source, since they are the longest time series of catch and effort data available from the fishery. This paper aimed to interpret the spatial and temporal catch and effort trends to the extent possible and to reconcile apparent changes in targeting practices against the actual catch. Catch and effort data collected by P.T. Perikanan Samodra Besar from its Benoa-based longliners during 1978-1995 were summed to obtain annual catch, effort, and catch per unit of effort trends. To generate spatial distributions of catch and effort, catch and effort data were aggregated by 5-degree squares. The data showed that P.T. Perikanan Samodra Besar vessels commenced deep longlining in 1983, i.e. 56% of the total sets in 1983 using 10 or more hooks between floats. Prior to that, P.T. Perikanan Samodra Besar vessels used 6 hooks between floats,which resulted in a larger amount of yellowfin tuna (Thunnus albacares) as well as overall tuna catch. However, bigeye tuna (Thunnus obsesus) catch per unit of effort only increased from 1992. The increase in big eye tuna catch per unit of effort coincided with a reduced fishing range and concentration within an area where P.T. Perikanan Samodra Besar had not previously experienced high big eye tuna catches, as opposed to focusing their effort on areas where they had historically caught big eye tuna. In the absence of supplementary information, and assuming that the switch to deep longlining in 1983 was done to target big eye tuna, the analysis suggests that the outcome of P.T. Perikanan Samodra Besar fishing activities between 1983 and 1991 were inconsistent with their objectives.
UTILITY OF FISHERY HIGH SCHOOL DATA IN EXAMINING SPATIAL AND TEMPORAL CATCH AND EFFORT TRENDS IN THE INDONESIAN LONGLINE TUNA FISHERY Sadiyah, Lilis; Dowling, Natalie; Prisantoso, Budi Iskandar; Andamari, Retno; Proctor, Craig
Indonesian Fisheries Research Journal Vol 21, No 2 (2015): (December 2015)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (525.002 KB) | DOI: 10.15578/ifrj.21.2.2015.117-128

Abstract

One of the endeavours to address the shortage of catch per unit effort (CPUE) information from the Indonesian Indian Ocean tuna fishery is the collation of a large amount of catch and effort data collected by Indonesian Fisheries High School students (“FHS data”). This paper attempts to investigate spatial-temporal patterns of catch and effort of the FHS data for the main tuna species caught by the fishery: bigeye tuna (Thunnus obesus - BET), yellowfin tuna (T. albacares - YFT), albacore (T. alalunga - ALB) and southern bluefin tuna (T.maccoyii - SBT). Reported sets occurred in the Eastern Indian Ocean, north and south of 20°S. Recorded effort from the FHS data set was concentrated within the only known SBT spawning ground. However, within this data set, SBT were recorded in the lowest catch proportion relative to BET, YFT and ALB. The catch composition data suggested that YFT and ALB were predominantly targeted by the fishery, with ALB and SBT most predominantly recorded south of 20°S, whereas BET and YFT were mostly recorded north of 20°S. Unfortunately, there was no strong information on targeting practices reported by this data set, limiting any attempts to understand the factors that influenced those results. As the sampling predominantly occurred in between July and December, the data are not representative of fishing activities throughout the entire year, and any seasonal patterns from the FHS data set are biased. In addition, the FHS data set is prone to observation error and uncertainty in terms of fish identification and fishing location. Therefore, the FHS data set needs to be interpreted with caution.
CPUE TRENDS OF THE INDONESIA’S TUNA LONGLINE FISHERY: LESSONS LEARNED FROM A TRIAL OBSERVER PROGRAM Sadiyah, Lilis; Dowling, Natalie; Prisantoso, Budi Iskandar; Andamari, Retno; Proctor, Craig
Indonesian Fisheries Research Journal Vol 20, No 1 (2014): (June 2014)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (394.382 KB) | DOI: 10.15578/ifrj.20.1.2014.37-47

Abstract

In an effort to address a shortage of reliable CPUE information, and as a preliminary step to a broader observer program, Indonesia established a Trial Observer Program (TOP) for the industrial tuna long line fishery based at Benoa Fishing Port, Bali, in mid 2005. The objectives of this paper are i) to describe spatial and temporal catch and effort trends from the Indonesian Indian Ocean industrial tuna long line fishery based at Benoa Fishing Port, and ii) to provide an understanding of the fishing strategies used by different companies and of the environmental conditions that may influence catch trends. The observed effort covered areas both north and south of 20°S, with a concentration within 10°-20°S; 105°-120°E which overlaps with the only known spawning grounds of southern bluefin tuna (SBT). This data set showed that SBT comprised the lowest catch proportion, relative to the other three tuna species caught, bigeye tuna (BET), yellowfin tuna (YFT) and albacore (ALB). BET and ALB had been suggested as the main target species for the fishery, but this varied by region. The TOP data set suggests that different tuna fishing companies targeted different species and used different fishing practices, including differences in bait used, areas fished, start time of setting, and the number of hooks between floats (HBF). It is a priority to improve the spatial and temporal coverage of the observer program before the data can be considered to be representative of the fleet, particularly given the high degree of variability in fishing practices between companies.
EXPLOITATION AND CPUE TREND OF THE SMALL PELAGIC FISHERIES IN THE SULAWESI SEA, INDONESIA Sadiyah, Lilis; Purwanto, Purwanto; Prasetyo, Andhika P.
Indonesian Fisheries Research Journal Vol 18, No 2 (2012): (December 2012)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (78.65 KB) | DOI: 10.15578/ifrj.18.2.2012.63-69

Abstract

One of the expected benefits of the Sulu-Celebes Sea Project during its implementation is to have increased fish stocks at demonstration sites, as indicated by the Catch per Unit of Effort (CPUE). Analysis of catch and effort data of the small pelagic fisheries by using the surplus yield model was done to obtain information on the likely trend of CPUE for the last ten years. By using the pajeko as the standardized fishing gear the trend of CPUE has been calculated. Between 2000-2005, the trend of production (catch), effort and CPUE followed the general pattern of the exploited fisheries that already fully exploited, where the increasing trend of effort was not followed by the increasing catch. On the other hand, the trend of CPUE is decreased. In the following years, the trend of both catch and CPUE do not follow the general pattern of the exploited fisheries. The trend of catch, effort and CPUE has likely been stable, indicating that the fishery in this period has been leveled-off. The status of exploitation of the small pelagic fish resources in the Indonesian Sulawesi Sea is demermined by the MSY level that has likely been surpassed during the period 2003-2004. Therefore with the increasing effort in the following year the trend of catch was relatively stable. It is likely that the small pelagic fish stock in the Indonesian Sulawesi Sea might be ‘fully exploited’.
DEVELOPING RECOMMENDATIONS FOR UNDERTAKING CPUE STANDARDISATION USING OBSERVER PROGRAM DATA Sadiyah, Lilis; Dowling, Natalie; Prisantoso, Budi Iskandar
Indonesian Fisheries Research Journal Vol 18, No 1 (2012): (June 2012)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (664 KB) | DOI: 10.15578/ifrj.18.1.2012.19-33

Abstract

Abundance indices based on nominal CPUE do not take into account confounding factors such as fishing strategy and environmental conditions, that can decouple any underlying abundance signal in the catch rate. As such, the assumption that CPUE is proportional to abundance is frequently violated. CPUE standardisation is one of the common analyses applied. The aims of this paper were to provide a statistical modelling framework for conducting CPUE standardisations using the Observer Program data for bigeye tuna, yellowfin tuna, albacore and southern bluefin tuna, and provide a comparison in the trends between the nominal CPUEs and their standardised indices obtained. The CPUE standardisations were conducted on the Observer Program collected between 2005 and 2007, by applying GLM analysis using the Tweedie distribution. The results suggested that year, area, HBF and bait factors significantly influenced the nominal CPUEs for the four tuna species of interest. Some extreme peaks and troughs in the nominal time series were smoothed in the standardised CPUE timeseries. The high degree of temporal variability that is still shown in the standardised CPUE trends suggests that the data are too sparse to give any meaningful indication of proxy abundance. Nevertheless, this may also suggest that variables used in the GLMs do not sufficiently account for allof the confounding factors, or abundance may indeed be truly variable.
BEBERAPA JENIS HASIL TANGKAP SAMPINGAN (BYCATCH) KAPAL RAWAI TUNA DI SAMUDERA HINDIA YANG BERBASIS DI CILACAP Prisantoso, Budi Iskandar; Widodo, Agustinus Anung; Mahiswara, Mahiswara; Sadiyah, Lilis
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.16.3.2010.185-194

Abstract

Ikan-ikan tuna di Samudra Hindia dieksploitasi menggunakan rawai tuna oleh Jepang sejak tahun 1952, kemudian menyusul Korea dan Taiwan pada tahun 1964. Rawai tuna di Indonesia mulai digunakan sejak tahun 1973, sejak didirikannya PT. Perikanan Samodera Besar, yang berbasis di Benoa, Bali. Kemudian alat tangkap ini berkembang dengan pesat sejak tahun 1990-an, di mana pada tahun 2001 mencapai 618 kapal kemudian meningkat menjadi 705 kapal pada tahun 2002 serta 746 kapal pada tahun 2010. Target dari rawai tuna di Samudra Hindia adalah ikan madidihang atau tuna mata besar (Thunnus obesus). Walaupun demikian, banyak jenis-jenis ikan lain yang ikut tertangkap sebagai hasil tangkap sampingan. Ikan tuna sirip biru selatan tertangkap dianggap sebagai byproduct karena nilai ekonominya yang sangat tinggi, sedangkan ikan paruh panjang, cucut, ikan teleost lainnya, penyu, dan burung laut sebagai bycatch. Ikan cucut tertangkap sebagai bycatch hanya 10 spesies dari 61 spesies yang diketahui di Samudra Hindia. Jenis ikan teleost lain tertangkap tujuh jenis. Jenis-jenis penyu yang tertangkap adalah penyu hijau (Chelonia mydas) dalam trip pertama tiga ekor dan trip ketiga satu ekor, dan penyu sisik (Eretmochelys imbricata) trip kedua dua ekor dan trip ketiga dua ekor. Burung laut hanya tertangkap dua ekor pada trip ketiga (bulan Oktober 2004) dengan rata-rata laju tangkap 0,20 ekor burung laut per 1.000 pancing. Tuna species in the Indian Ocean have been exploited since 1952 by Japanese tuna longliners and followed by Taiwanese and Korean longliners in 1964. Indonesian company started to use this gear since 1973 when the government established PT. Perikanan Samodera Besar based in Benoa, Bali. In 1990s, this gear employed rapidly, where in 2001 the number of the boats was 618 boats, in 2002 increased up to 705 boats and became 746 boats in 2010. The main target of longline in Indian Ocean is yellowfin and bigeye tunas, however, many other species were caught as bycatch. Southern bluefin tuna was also caught but deemed as byproduct, whilst billfishes, sharks, rays, and other teleosts, turtle, and seabirds as bycatch. There were 61 shark species known from Indian Ocean, but only 10 species were caught. There were 7 species of other teleosts caught. The sea turtle caught were green sea turtle (Chelonia mydas), three in the first trip and one in the third trip. The other species caught was hawksbill sea turtle (Eretmochelys imbricate), two in the second trip and two in the third trip. There was only two seabirds caught during the third trip (October 2004), it meant that the possibility of bird caught was 0.20 at 1,000 hooks.
PARAMETER POPULASI DAN BIOLOGI REPRODUKSI IKAN BENTONG (Selar crumenophthalmus) DI PERAIRAN KWANDANG,GORONTALO UTARA Faizah, Ria; Sadiyah, Lilis; Hariati, Tuti
BAWAL Widya Riset Perikanan Tangkap Vol 6, No 2 (2014): (Agustus 2014)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (326.475 KB) | DOI: 10.15578/bawal.6.2.2014.111-117

Abstract

Perairan Kwandang merupakan salah satu basis utama perikanan pelagis kecil di perairan laut Sulawesi. Salah satu jenis yang banyak dimanfaatkan adalah ikan bentong (Selar crumenophthalmus). Penelitian ini bertujuan untukmenduga parameter populasi, tingkat pemanfaatan (E), dan biologi reproduksi dari ikan bentong. Data panjang cagak dikumpulkan dari PP Kwandang dari bulan Januari hingga November 2012. Pendugaan parameter populasi dilakukan dengan menggunakan metode Bhattacharya dengan bantuan software FISAT II Hasil analisis menunjukkan bahwa laju pertumbuhan (K) sebesar 0,76 per tahun dengan L”=24,7 cm. Laju kematian total (Z) sebesar 2,63 per tahun, dengan laju kematian alamiah (M) sebesar 1,28 per tahun, laju kematian akibat penangkapan (F) sebesar 1,3 per tahun dan laju pemanfaatan 0,51. Tingkat pemanfaatan ikan bentong sudah relatif optimum. Rasio jenis kelamin ikan bentong jantan dan betina adalah 1: 1,02. TKGI paling banyak ditemukan. Musim pemijahan ikan bentong diduga terjadi pada bulan November dan Desember.The Kwandang waters is one of the main base for small pelagic fisheries in Sulawesi sea. Bigeye scad (Selar crumenophthalmus) is one of species from small pelagic is exploited. The objectives of the research was to estimate the population parameters, exploitation rate and reproductive biology of bigeye scad. Length frequency data were collected from PP Kwandang, from January November 2012. Estimation of population parameters of bigeye scad used FISAT II method. The results showed that growth rate as follows (K) = 0,76 year-1 , L”=24,7 cm. Total mortality rate (Z) = 2,63 year-1, with natural mortality (M) = 1, year-1 and fishing mortality (F) = 1,3 year-1 and exploitation rate (E)=0,51. The exploitation rate are already optimum. Sex ratio of male and female are 1:1,02. The most commonly founded is Gonado Maturity Stage of I. The spawning season of bigeye scad estimated was November and December
SHARK LONGLINE FISHERY IN TANJUNGLUAR-EAST LOMBOK Dharmadi, Dharmadi; Faizah, Ria; Sadiyah, Lilis
Indonesian Fisheries Research Journal Vol 19, No 1 (2013): (June 2013)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4131.081 KB) | DOI: 10.15578/ifrj.19.1.2013.39-46

Abstract

Studies on artisanal shark fisheries in Tanjungluar - East Lombok were conducted during the year 2001-2011 (except in 2003 and 2007). A sampling method called “rapid market survey” method was employed to collect catch data from surface and bottom longlines fishing, rapidly. Biological data and fisheries data were collected during survey. Catch data for shark were also obtained from daily records filled by TPI officers in Tanjungluar between 2009 and 2010. The results showed that sharklongline fishing was conducted every month. The trend of shark catches relates to the number of fishing vessels, fishing ground, and weather conditions at sea. The period between July and September is a transitional season from East to West seasons. During this season, the wind strength is weakened and a good fishing season for the fishers. The lowest catch occurs in January (1.06 tonnes) and the highest catch in September with the total catch of 24.6 tonnes. Sharks caught by surface longline were dominated by Silky shark, Carcharhinus falciformis (40-90%) with the size range of 100-125 cm. The catch of bottom longline was mostly consisting of fish in mature condition that dominated by Grey reef shark (Carcharhinus amblyrhynchos), Common black tip shark (C. limbatus), Spot tail shark (C. sorrah), and Scalloped hammerhead shark (Sphyrna lewini), with the size range of 125-200 cm, 170- 250 cm, 100-150 cm, and 170-300 cm, respectively. Surface longline fishing occurs in the offshore waters in depth more than 200 m to 3000 m, whereas bottom longline fishing is operated at a depth of 50-100 m around islands.