scholarly journals Gillnet Selectivity on the Narrow-barred Spanish Mackerel (Scomberomorus commerson) Fishery in Pangandaran Waters

2021 ◽  
pp. 13-19
Author(s):  
Izza Mahdiana Apriliani ◽  
Lantun P. Dewanti ◽  
Herman Hamdani ◽  
Soraya Gigentika ◽  
Rachmad Cesario ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Length Distribution ◽  
Fork Length ◽  
Mesh Size ◽  
Fishing Gear ◽  
Length Frequency ◽  
Class Interval ◽  
Spanish Mackerel ◽  
Selectivity Curve ◽  
Scomberomorus Commerson

Analyzing the selectivity of gillnet fishing gear using two different mesh sizes, namely 3.5 and 4 inches. Gillnets of these mesh sizes are commonly used by fishermen in Fish Landing Base (PPI) Cikidang, Pangandaran Regency, West Jawa. A total of 8 fishing trips were conducted at the coastal waters around PPI Cikidang, Pangandaran Regency, West Java from August 2018 to January 2019  using gillnet fishing gear As for each trip, 2-3 times the operation of the tool is carried out. The operation of the fishing gear is carried out with the help of vessels measuring 2-3 Gross Tonnage (GT). The catch obtained was differentiated based on the main catch and bycatch and the amount is calculated for analysis of the proportion of the catch. Mackerel (Scomberomorus commerson) is caught as the main catch, the fork length was measured for analysis of the length frequency distribution and selectivity curves. The operation of gillnets with a mesh size of 3.5 inches obtained a higher proportion of bycatch compared to gillnets with a mesh size of 4 inches. In addition, the length distribution of mackerel caught by gillnets with a mesh size of 3,5 inches is smaller (27-49 cm FL) compared to a mesh size of 4 inches (40-55 cm FL). Based on the distribution of length distribution, gillnets with a mesh size of 3.5 inches are more dominant in catching mackerel in a smaller size class interval than gillnets with a mesh size of 4 inches. Meanwhile, based on the selectivity curve for the length of mackerel with a 50% chance of being caught, it shows that gillnets with a mesh size of 3.5 or 4 inches are selective in catching mackerel, this is because the chances of catching fish at more than L50 are high.

scholarly journals Selectivity of Gillnet to Catch Silver Pomfret (Pampus argenteus) in Pangandaran Waters, Indonesia

2021 ◽  
pp. 7-14
Author(s):  
Izza Mahdiana Apriliani ◽  
Herman Hamdani ◽  
Yuniar Mulyani ◽  
Heti Herawati ◽  
Dear Frans Lyandre Simanjorang
Keyword(s):  
Coastal Waters ◽  
Length Distribution ◽  
Fork Length ◽  
Mesh Size ◽  
Primary Data ◽  
Fishing Gear ◽  
West Java ◽  
Class Interval ◽  
Pampus Argenteus ◽  
Silver Pomfret

The purpose of this research was to determine the most selective mesh size of gillnet fishing gear for Pampus argenteus in coastal waters of Pangandaran Regency, West Java. Research on the selectivity of gillnet fishing gear was carried out in the coastal waters of Pangandaran, West Java Province, from August 2018 to January 2019. The method used in this research is experimental fishing, namely operating gillnet fishing gear directly in the fishing area with fishermen. The primary data collected was the measurement of the catch (fish weight, number, fork length, how the fish was caught, circumference (girth opercullum, maximum body girth). Meanwhile, the secondary data collected were supporting data from the Pangandaran District Fisheries and Marine Service, and literature study. In determining the sampling, the method used is the purposive sampling method. The operation of gillnets using 4.5 inches obtained a higher proportion of main catch (75%) than gillnets with a mesh size of 5 inches (44%). Gillnet with a mesh size of 4.5 inches, the silver pomfret caught was distributed between 17-22 cm in size with the highest mode in the 19 cm fork length. Unlike the gillnet fishing gear with a mesh size of 5 inches, the silver pomfret caught was distributed in the fork length range of 17-25 cm with the highest mode in the length class 19 cm fork length. mesh size 4.5 inches has a hanging ratio value of 0.51. Meanwhile, the 5 inch mesh size has a hanging ratio value of 0.54. Based on the length distribution, gillnets with a mesh size of 5 inches were more dominant in catching silver pomfret in a larger size class interval than gillnets with a mesh size of 4,5 inches. Based on the L50 value, both selective gillnets caught more fish at 50% second chance. The selectivity curve shows that gillnet fishing gear with a mesh size of 5 inches has more selective results than gillnets with a mesh size of 4.5 inches. 

scholarly journals Determination of gill-net selectivity for King Fish (Scomberomorus Commerson, Lacepede 1800) using Mesh size in Sungailiat, Bangka Belitung Province

2021 ◽  
Vol 16 (4) ◽  
Author(s):  
Pareng Rengi ◽  
Polaris Nasution ◽  
Arthur Brown ◽  
Ayu Nita Ervina Tambunan
Keyword(s):  
Standard Deviation ◽  
Population Distribution ◽  
Fork Length ◽  
Mesh Size ◽  
Fishing Gear ◽  
Gill Net ◽  
Scomberomorus Commerson ◽  
L Value

Selectivity is a fishing gear characteristic capable of catching fish of a specific size and species from the existing population distribution. Mesh size is one of the important factors that influence gillnets’ selectivity, because different length-classes of fish are caught by them. This report focuses on the selectivity of two mesh sizes of gillnets (8.89 cm and 10.16 cm) on mackerel's catch and constructing a gillnet in Sungailiat waters. Experimental fishing methods and selectivity analysis were used for the fishing gear’s more selective preparation, if the largest fishing ratio's value at the fork length (L) is high and the standard deviation value (S) is closer to 1. It is concluded that to be more selective a largest S (L) value of 0.999267194 at fork length (L=54.95 cm), and with a larger value of S (L) 0.997096071 and with (L=66.55 cm) for mesh Sizes 8.89 cm and 10.16 cm, respectively.

scholarly journals Food and feeding habits of the narrow barred Spanish mackerel, Scomberomorus commerson (Lacepede, 1800) off Karnataka, south-west coast of India

2017 ◽  
Vol 64 ◽  
Author(s):  
K. M. Rajesh ◽  
P. Rohit ◽  
S. Thomas ◽  
V. Suprabha ◽  
G. D. Nataraja ◽  
...  
Keyword(s):  
Feeding Habits ◽  
Fork Length ◽  
Empty Stomach ◽  
Spanish Mackerel ◽  
Scomberomorus Commerson ◽  
South West Coast ◽  
Food And Feeding ◽  
Fish Remains ◽  
Index Of Relative Importance ◽  
Almost All

Scomberomorus commerson were collected on weekly basis during January 2012 to December 2014 at Mangalore Fishing Harbour. Stomach of 214 narrow barred Spanish mackerel measuring from 48 to 105 cm fork length (FL) for males and 45.5 to 115 cm FL for females were analysed to study their feeding habits. Fish with empty stomach were prevalent in almost all the months. Prey mainly comprised of fishes and crustaceans, with the fish component forming 99.9%. The index of relative importance (IRI) showed that the dominant prey were semi-digested fish remains (44.6%) of Sardinella longiceps (30.1%), Decapterus sp. (18.7%), whitebaits (2.5%), Rastrelliger kanagurta (1.5%) and Epinephelus spp. (1.1%), while Saurida sp. (0.7%), Megalaspis cordyla (0.5%), Scombroides sp. (0.2%) and shrimps (0.1%) were found occasionally in the gut. Index of stomach fullness (SFI) was 0.11 in August and 0.65 in January. Generally, SFI was higher during September to January and lower during February to August. The empty stomach ratio (ESR) ranged from 33.3% (August) to 92.3% (April).

scholarly journals ANALISIS BIOEKONOMI SUMBER DAYA IKAN TENGGIRI (Scomberomorus commerson) DI PERAIRAN KABUPATEN INDRAMAYU JAWA BARAT)

2014 ◽  
Vol 4 (2) ◽  
pp. 117
Author(s):  
Lugas Lukmanul Hakim ◽  
Zuzy Anna ◽  
Junianto Junianto
Keyword(s):  
Natural Resources ◽  
Fishing Effort ◽  
Fishing Ground ◽  
Survey Method ◽  
Fishing Gear ◽  
Total Allowable Catch ◽  
Spanish Mackerel ◽  
Management Regime ◽  
Gill Net ◽  
Scomberomorus Commerson

Penelitian ini memaparkan analisis bioekonomi pemanfaatan sumber daya ikan tenggiri pada berbagai rezim melalui Model Gordon Schaefer dengan model estimasi parameter biologi CYP serta arah kebijakan pengelolaannya di Kabupaten Indramayu. Penelitian ini dilaksanakan pada Bulan Februari-Juli 2014 dengan metode survey melalui analisis kuantitatif deskriptif. Hasil penelitian menunjukkan laju pertumbuhan intrinsik (r) adalah 10,291 ton/tahun, koefisien daya tangkap (q) adalah 0,001673 ton/trip, daya dukung lingkungan adalah 250,028 ton/tahun, biaya (c) adalah 1,762 Rp/trip dan harga (p) adalah 30,750 Rp/ton. Upaya maksimum lestari (EMSY) yaitu 3076 trip/tahun dengan nilai produksi maksimum lestari (hMSY) sebesar 643,260 ton/tahun. Upaya MEY (EMEY) sebesar 2654 trip/tahun dengan produksi (hMEY) sebesar 631,141 ton/tahun. Upaya penangkapan perikanan terbuka (Eoa) adalah 5.308 trip/tahun dengan produksi (hOA) sebesar 304,689 ton/tahun. Kegiatan pemanfaatan menunjukkan tangkap lebih secara biologi dan ekonomi. Implementasi kebijakan dari penelitian ini adalah pembatasan upayasebesar 314-736 trip, pengaturan armada alat tangkap jaring insang hanyut adalah 353-409 unit, payang 0-5 GT adalah 409-474 unit, payang > 5-10 GT adalah 73-85 unit, Jumlah tangkapan diperbolehkan ikantenggiri sebesar 514,608 ton dengan kuota jaring insang hanyut sebesar 485,680 ton, payang 0-5 GT sebesar 5,772 ton, payang > 5-10 GT sebesar 23,156 ton, pengaturan teknis lainnya (perlindungan SDAdan DPI, pengawasan pemanfaatan sumber daya dan pungutan perikanan tangkap).Title: Bioeconomic Analysis of Narrow-barred Spanish Mackerel (Scomberomorus commerson) in The Water of Indramayu Regency West JavaThis research analyzed bioeconomic modelling of narrow-barred spanish mackerel in every fisheries management regime through Gordon Schaefer Model and CYP Parameter Estimation model, also a direction of its management policy in Indramayu Region. This research was conducted from February to July 2014, survey method and descriptive quantitative analysis were used in carrying out this research. The results of this research indicated that intrinsic growth parameter (r) of narrow-barredspanish mackerel approximately 10,291 ton/year, catchability coefficient (q) was about 0,001673 ton/trip, carrying capacity (K) reached at 250,028 ton/year, cost (c) was 1,762 Rp/trip and price (p) was 30,750Rp/ton. Maximum sustainable yield fishing effort (EMSY) reached at 3,076 trip/year with productionof MSY (hMSY) approximately 643,260 ton/year. MEY fishing effort (EMEY) reached 2,654 trip/year with MEY production (hMEY) Approximately 631,141 ton/year. Open access fishing effort (Eoa) reached about 5.308 trip/year with production (hOA) approximately 304,689 ton/year. Harvesting of narrow-barred spanish mackerel indicated biological and economic overfishing. The implementation from this research results were conducting limited entry for 314-736 trip; controlling fishing fleet for each fishing gear: gill net (< 5 GT) was about 353-409 unit, seine net (< 5 GT) was about 409-474 unit, others seine net (>5- 10GT) was 73-85 unit; Total Allowable catch of narrow-barred spanish mackerel was about 514,608 ton with quote for every fishing gear: gill net was about 485,680 ton, seine net (<5GT) approximately 5,772 ton,others seine net (>5-10GT) was about 23,156 ton; and others in technical control (natural resources and fishing ground conservation, controlling of natural resources harvesting and fishing fee aplication).

scholarly journals Demographics of Scomberomorus commerson in the Central Taiwan Strait

2021 ◽  
Vol 9 (12) ◽  
pp. 1346
Author(s):  
Jinn-Shing Weng ◽  
Li-Chi Cheng ◽  
Yun-Sin Lo ◽  
Jen-Chieh Shiao ◽  
Jia-Sin He ◽  
...  
Keyword(s):  
Growth Parameters ◽  
Fork Length ◽  
Taiwan Strait ◽  
Biological Data ◽  
Northwestern Pacific ◽  
Age Composition ◽  
Annual Cycles ◽  
Spanish Mackerel ◽  
Scomberomorus Commerson ◽  
Central Taiwan

The narrow-barred Spanish mackerel Scomberomorus commerson is an economically essential species; however, few studies have investigated its demographic structure in the northwestern Pacific, which includes Taiwan’s waters. This study examined the growth parameters, age composition, mortality, and sex ratio of S. commerson catches by examining sagittal otoliths and other biological data collected in a 3-year project from June 2018 to June 2021. The transverse sections of sagittal otoliths exhibited alternating translucent and opaque zones, in annual cycles, and this observation was validated by otolith edge analysis. Opaque zones began to form in October; the growth peaked in December and lasted until March. Growth parameters were estimated for female (L∞ = 144.1 cm fork length [FL], k = 0.39 y−1, to = −0.85 y) and male (L∞ = 136.0 cm FL, k = 0.32 y−1, to = −1.49 y) specimens. The maximum recorded FL, body weight, and age were 159.0 cm, 27 kg, and 9.2 y for female and 135.0 cm, 17.8 kg, and 7.2 y for male specimens. Rapid growth was observed for both sexes, with FL reaching 66.8 ± 14.2 cm in female specimens and 70.1 ± 11.0 cm in male specimens during the first year of life. An age–length key based on the direct otolith aging and FL dataset (N = 646) was used to estimate the age composition of 3-year catches measured at landing (N = 16,133). The results verified that the S. commerson currently caught in the central Taiwan Strait are mainly young fish aged 1+ to 2+ y. The estimated fishing mortality (0.27 y−1) and exploitation rate (0.30) suggested that overfishing was not occurring in this stock. The findings of this study have helped clarify the population dynamics of the S. commerson in the Taiwan Strait, and the biological parameters reported herein can aid the management and conservation to ensure the sustainability of this species in this region.

Effects of season and mesh size on the selection of narrow-barred Spanish mackerel, Scomberomorus commerson in the Persian Gulf artisanal gillnet fishery

2021 ◽  
pp. 1-5
Author(s):  
Mojtaba Pouladi ◽  
Seyed Yousef Paighambari ◽  
Matt K. Broadhurst ◽  
Russell B. Millar ◽  
Morteza Eighani
Keyword(s):  
Relative Size ◽  
Mesh Size ◽  
Early Summer ◽  
Size Selection ◽  
Spanish Mackerel ◽  
Stock Biomass ◽  
Scomberomorus Commerson ◽  
Mean Size ◽  
The Persian Gulf ◽  
Selection Of

Abstract In response to perceived, but unknown variation among the size selection of narrow-barred Spanish mackerel (Scomberomorus commerson) by artisanal gillnetters off Iran, and the need for such data to control exploitation as a precursor to balanced harvesting, the effects of two common mesh sizes (130 and 140 mm stretched mesh opening made from multifilament twine) on catches were investigated over one fishing year (nine months encompassing autumn to spring). Both mesh sizes mostly caught S. commerson at fork lengths (FL) larger than mean sizes at maturity (>67 cm), with the mean size selection incrementally increasing in the 130-mm mesh gillnet from autumn, and especially during spring. The greater selection occurred concurrent with an increasing condition factor (CF) among S. commerson, which typically spawn in late spring/early summer. Conversely, the relative size-selection of the 140-mm mesh gillnet decreased in spring, attributed to increasing CF precluding the capture of larger fish. Such seasonal variation in size selection might be countered by increasing mesh size to ~145 or 150 mm in spring. However, the existing 140-mm mesh might positively affect stock biomass by allowing larger, more fecund fish to avoid capture during spawning. The data support the strong influence of biological and environmental factors on gillnet size selection, which might also extend to other migratory, pelagic species.

scholarly journals EVALUASI SELEKTIVITAS JARING INSANG DI TELUK KOTANIA, SERAM BAGIAN BARAT

2020 ◽  
Vol 5 (1) ◽  
pp. 91-100
Author(s):  
Grace Hutubessy
Keyword(s):  
Habitat Preference ◽  
Length Distribution ◽  
Environmentally Friendly ◽  
Mesh Size ◽  
Shallow Waters ◽  
Size Spectrum ◽  
Fishing Gear ◽  
Size Spectra ◽  
West Part ◽  
High Catch

Jaring insang digolongkan sebagai alat tangkap yang ramah lingkungan mengingat ukuran ikan yang tertangkap dipengaruhi oleh ukuran mata jaring yang digunakan. Penelitian yang dilakukan selama 2013-2014 di perairan Kotania, Kabupaten Seram Bagian Barat bertujuan untuk menghitung kelimpahan ikan pada spektrum ukuran (abundance size-spectrum) berdasarkan habitat ikan pada waktu yang berbeda. Data dikumpulkan melalui logbook yang diisi oleh nelayan Dusun Pulau Osi dan Dusun Wael dengan daerah penangkapan di Teluk Kotania. Distribusi panjang ikan hasil tangkapan setiap mata jaring menunjukkan kisaran panjang yang tidak beraturan yang bisa menimbulkan selektivitas yang tidak konsisten. Ketidakpastian selektivitas jaring insang yang dioperasikan pada perairan dangkal disebabkan oleh perubahan pilihan habitat sebagai daerah penangkapan nelayan. Spektrum panjang menunjukkan distribusi panjang yang unimodal dengan jumlah ikan jenis ikan berukuran kecil tinggi dan menurun secara eksponensial untuk jenis ikan berukuran besar. Mengingat ikan besar mempunyai peranan penting dalam komunitas, dan kurang rentan terhadap jaring insang, kami menyimpulkan bahwa jaring insang adalah alat yang ramah lingkungan.EVALUATION OF GILLNET SELECTIVITY IN KOTANIA BAY, WEST PART OF SERAM. Gillnets are categorized as environmentally friendly fishing gear convinced by its selectivity. Study conducted at Kotania Bay, West Seram Regency, for two years (2012-2013) aimed to count the abundance size-spectrum on habitat for evaluating the catch of gillnets. Length distribution of catch for each mesh size showed irregular ranges, which may lead to selectivity uncertainties. Data was collected from logbooks filled by fishers from Osi Island and Wael. Uncertainty of gillnets selectivity which were operated in shallow waters was influenced by the fishers’ habitat preference that was distinct temporally. The size-spectra of exhibited unimodal length distribution with high catch of small-bodied species and lowered exponentially towards large-bodied species. As large- bodied species play important role in the community and they are less vulnerable to gillnets, we concluded that the practices of gillnet at Kotania Bay are environmentally friendly gear.

scholarly journals STUDI DESAIN DAN KOMPOSISI JENIS HASIL TANGKAPAN ALAT TANGKAP TRAP NET DI PERAIRAN KECAMATAN SIGERI KABUPATEN PANGKEP

2019 ◽  
Vol 2 (1) ◽  
pp. 86-99
Author(s):  
Mustamin Tajuddin ◽  
Ihsan H.Cotte ◽  
Asmidar Asmidar
Keyword(s):  
Coastal Waters ◽  
Sustainable Use ◽  
Secondary Data ◽  
Mesh Size ◽  
Economic Feasibility ◽  
Fishing Ground ◽  
Fishing Gear ◽  
Environmental Friendliness ◽  
Coastal Fisheries ◽  
Fisheries Resources

The research is entitled Utilization of coastal fisheries resources with trap net fishingequipment in the waters of Pangkep Regency. Related to that, the community uses thepotential of fish resources in the coastal waters of Pangkep Regency with a variety offishing gear, one of which is trap net (local read: tiku). Objectives are: 1) Knowing thecomposition of the type of trap net caught operated in coastal waters; 2) Knowing thelevel of environmental friendliness of the trap net fishing equipment operated in coastalwaters 3) Knowing the economic feasibility of trap net fishing equipment operated in thecoastal waters of Pangkep Regency. This research is expected to provide constructorsregarding the composition of catches in the use of Coastal Fishing Ground resourceswith net trap fishing equipment in the waters of Pangkep Regency, South Sulawesi toensure access to sustainable use of fisheries resources. The study was conducted in June -December 2018 in the coastal waters of Sigeri District, Pangkep Regency. Materials andtools related directly or indirectly to research to make measurements and observations inthe field. The data needed consists of pruimer and secondary data. To achieve the goal,the data collected is carried out by analyzing fishing gear designs and analyzing thecomposition of catch species.The design of the trap net fishing gear is rectangular with avery small mesh size and the material is made of nylon (waring). The size of the trap netis 500 meters long and 1.5 meters wide. The composition of the types of trap net catchesoperated in the coastal waters of Pangkep Regency is very large and in general, fish thatmigrate daily at low tide take place.

scholarly journals Analisis Komposisi Hasil Tangkapan Bagan Perahu Dan Tancap Di Perairan Teluk Kupang

2021 ◽  
Vol 10 (1) ◽  
pp. 117-122
Author(s):  
Joi Alfreddi Surbakti ◽  
Rikka Welhelmina Sir
Keyword(s):  
Fork Length ◽  
Mesh Size ◽  
Tail Length ◽  
Survey Method ◽  
Fishing Gear ◽  
Body Width ◽  
Fish Resources ◽  
Straight Line ◽  
Dominant Fish ◽  
Fish Catch

Salah satu masalah yang dihadapi dalam pemanfaatan sumberdaya ikan adalah kurang selektifnya berbagai jenis alat tangkap yang digunakan oleh para nelayan. Akibatnya adalah tertangkapnya ikan-ikan yang bukan menjadi tujuan penangkapan (bycatch) yang dalam prakteknya sebagian besar ikan-ikan tersebut dibuang ke laut (discarded catch). Penelitian ini bertujuan untuk mengidentifikasi dan menginventarisasi komposisi jenis dan ukuran ikan hasil tangkapandari alat tangkap bagan perahu dan bagan tancap.Lokasi penelitian di Kelurahan Oesapa sebagai sentra pemukiman nelayan bagan perahu danbagan tancap di Kota Kupang dan di Perairan Teluk Kupang.Penelitian ini dilakukan menggunakan metode survei dengan obyek penelitian yaitu: fakta, proses, histori, persepsi tentang perikanan bagan perahu, komposisi jenis dan ukuran ikan tangkapan yang meliputi identifikasi hasil tangkapan, berat (kilogram), jumlah (ekor), panjang cagak (fork length), keliling maksimum (maximum girth), dan lebar badan ikan. Cara mengukur panjang baku pada penelitian ini yaitu jarak garis lurus antara ujung bagian kepala yang paling depan (biasanya ujung salah satu dari rahang yang terdepan) sampai ke pelipatan pangkal sirip ekor.Hasil menunjukkan bahwa jenis ikan yang dominan tertangkap pada bagan perahu adalah ikan teri, peperek dan kembung, sedangkan pada bagan tancap ikan peperek, teri dan tembang. One of the problems faced in using fish resources is the lack of selectivity of various types of fishing gear used by fishermen. The result is the catch of fish which is not the purpose of arrest(bycatch) which in practice most of the fish are discarded catch. This study aims to identify and inventory the type and size offish catches (boat lift net and fix lift net). Research location in Oesapa village in Kupang City in Kupang Bay. This research was conducted by survey method with research object that is: fact, process, history, perception of fishery boat lift net, species composition and size of fish catch including identification of catch, weight (kilogram), number (tail), length of fork length, maximum girth, and fish body width, mesh size. The method of measuring the standard length in this study is the distance of a straight line between the tip of the front of the head (usually the tip of one of the leading jaws) to the tail fin's base. The results show that the dominant fish species in boat lift net are anchovies, pony fishes, and long-jawed mackereland, from fix lift net, are pony fishes, anchovy and sardine. 

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