scholarly journals Short Communication: The species and body size composition of pelagic fishes that caught by troll line in the fish landing of Sendang Biru, East Java, Indonesia

2019 ◽  
Vol 20 (6) ◽  
Author(s):  
DEWI HIDAYATI ◽  
BUGGIE OCLANDHI ◽  
NOVA MAULIDINIA ◽  
NOOR NAILIS SA’ADAH ◽  
AWIK PUJI DYAH NURHAYATI
Keyword(s):  
Body Size ◽  
Fish Species ◽  
Short Communication ◽  
Size Composition ◽  
Pelagic Fish ◽  
Yellowfin Tuna ◽  
The Body ◽  
Skipjack Tuna ◽  
Pelagic Fishes ◽  
Fish Samples

Abstract. Hidayati D, Oclandhi B, Maulidinia N, Sa’adah NN, Nurhayati APD. 2019. Short Communication: The species and body size composition of pelagic fishes that caught by troll line in the fish landing of Sendang Biru, East Java, Indonesia. Biodiversitas 20: 1764-1769. Troll line is the most used pelagic fishing gear for fishermen in Sendang Biru, the part of Indian ocean at East Java, which have an impact on the catch composition. The study was aimed to obtain data on species composition and size of pelagic fish caught in troll line in Sendang Biru, East Java, Indonesia. Fish samples were collected from nine different vessels landed in Sendang Biru for three days in April 2018. The composition of fish species was measured based on relative abundance. The fish size composition was obtained by measuring fork length which is also used to determine the stage of development of juvenile (Jv) or adult (Ad) fish. The results of the research showed there were four pelagic fish species which dominated by Katsuwonus pelamis or skipjack tuna (50.05%) and Thunnus albacares or yellowfin tuna (47.95%) and a small amount of Coryphaena hippurus and Makaira mazara. According to the body size, the fish caught by troll line in Sendang Biru is dominated by adult skipjack tuna (41-60 cm) and juvenile yellowfin tuna (21-78 cm).

scholarly journals Fishing season of large pelagic fish in Idi Rayeuk waters, East Aceh, Indonesia

DEPIK ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 167-173
Author(s):  
M.A. Chaliluddin ◽  
Rizka Alfita ◽  
Thaib Rizwan ◽  
Rahmat Rizqi ◽  
Rosi Rahayu ◽  
...  
Keyword(s):  
Time Series ◽  
Water Surface ◽  
Pelagic Fish ◽  
Yellowfin Tuna ◽  
Thunnus Albacares ◽  
Skipjack Tuna ◽  
Katsuwonus Pelamis ◽  
Fishing Season ◽  
Fish Samples ◽  
Euthynnus Affinis

Large pelagic fish live on the water surface in groups. Skipjack tuna (Katsuwonus pelamis), yellowfin tuna (Thunnus albacares), mackerel tuna (Euthynnus affinis), mackerel (Scomberomous guttatus) are species of fishes that mainly catches by fishermen using purse seines. This study aims to determine the length and weight of large pelagic fish in the water of Idi Rayeuk and best the fishing season. This research was conducted in one month. Fish samples were collected from fishermen that used purse seine and landed their catches at the Idi Rayeuk Fishing Port, East Aceh. Additionally, the data was derived from the fishing port time-series during 2015 to 2019. The result showed that the yellowfin tuna (Thunnus albacares) has a length between 37 - 58 cm with a weight of 1.0 - 3.2 kg, skipjack tuna (Katsuwonus pelamis) 32 - 58 cm in length and weight 0.5 - 3.0 kg, mackerel tuna has 33 - 54 cm of length with a weight of 0.6 - 2.5 kg, and mackerel has 44 - 66 cm of length and weighing 0.7 - 1.7 kg. Its also found that the peak season for catching yellowfin tuna (Thunnus albacares) and mackerel tuna is May and June, and the lowest season in December for the yellowfin tuna, and December and January for the mackerel tuna. The peak season for skipjack fishing occurs in May, August, and October, and the low season occurs in November and December. Meanwhile, the peak season for fishing mackerel occurs in May, September, and October, while the low season occurs in January, February, and March.Keywords:Fishing seasonLarge pelagicPurse seineIdi RayeukAceh

scholarly journals PRODUKTIVITAS PENANGKAPAN IKAN PELAGIS BESAR MENGGUNAKAN PANCING ULUR YANG BERPANGKALAN DI KABUPATEN MAJENE (Large Pelagic Fisheries Productivity by Using Handline Based in Majene District)

2016 ◽  
Vol 6 (2) ◽  
pp. 129
Author(s):  
Alfa FP. Nelwan ◽  
. Sudirman ◽  
Mukti Zainuddin ◽  
Muh. Kurnia
Keyword(s):  
Fish Species ◽  
Pelagic Fish ◽  
Yellowfin Tuna ◽  
Fishing Ground ◽  
Thunnus Albacares ◽  
Skipjack Tuna ◽  
Fishing Activity ◽  
Katsuwonus Pelamis ◽  
Auxis Thazard ◽  
Pelagic Fisheries

<p>-------</p><p>ABSTRACT</p><p>Large pelagic fish is a fishery commodity which has a high economic value, so its development can improve the economy of communities and regions. The aim of this study was to determine the fishing productivity of large pelagic fisheries using handline. This research was conducted in July until September 2012. This study examines the fishing productivity of handling with operated by a fisherman in Majene district, West Sulawesi. Fishing activity utilizing FADs as a fishing ground. Fishing Productivity was obtained from the weight ratio of the amount of catches and duration of fishing time. Fishing productivity is determined for each type of fish catches, namely skipjack tuna (Katsuwonus Pelamis), yellowfin tuna (Thunnus albacares), and mackerel tuna (Auxis thazard). The proportion of the total catches of skipjack tuna showed greater than other fish species. The relationship between fishing productivity with the time fishing is declining with increasing duration of time fishing. Cluster analysis showed that there are two clusters of fishing productivity for 23 fishing activity. Fishing ground with the largest production was in the FADs in 118031'44,8''E and 118°34'16.0"E, and 04030'25.6"S and 118029'37,3''BT. Large pelagic fish species observed is the skipjack tuna (Katsuwonus pelamis), yellowfin tuna (Thunnus albacares), and tongkol (Auxis hazard). Fishing productivity shows the downward trend and the fishing ground for the production of tuna, mackerel and yellowfin tuna fish highest in FADs at position 04026’06,3”S and 118031’44,8’’E ; 04030’25.6”S and 118029’37,3’’E.<br /><br />Keywords: FADs, fishing productivity, handline, large pelagic, majene<br /><br />ABSTRAK<br /><br />Ikan pelagis besar merupakan salah satu komoditi perikanan yang memiliki nilai ekonomi yang relatif tinggi, sehingga pengembangan perikanan pelagis besar dapat meningkatkan ekonomi masyarakat dan daerah. Tujuan penelitian ini adalah menentukan produktivitas penangkapan ikan pelagis besar menggunakan pancing ulur. Penelitian ini dilakukan pada Bulan Juli-September 2012. Penelitian ini mengkaji produktivitas penangkapan pancing ulur yang dioperasikan nelayan di Kabupaten Majene, Sulawesi Barat. Aktivitas pemancingan memanfaatkan rumpon sebagai daerah penangkapan ikan. Produktivitas penangkapan diperoleh dari perbandingan berat jumlah hasil tangkapan dengan lama waktu pemancingan. Produktivitas penangkapan ditentukan pada masing-masing jenis ikan hasil tangkapan, yaitu cakalang (Katsuwonus pelamis), tuna ekor kuning (Thunnus albacares), dan tongkol (Auxis thazard). Proporsi jumlah hasil tangkapan menunjukkan cakalang lebih besar dibandingkan jenis ikan lainnya. Hubungan antara produktivitas penangkapan dengan lama waktu pemancingan menunjukkan kecenderungan menurun dengan bertambahnya lama waktu pemancingan. Analisis kluster menunjukkan terdapat dua kluster produktivitas penangkapan selama 23 aktivitas pemancingan. Daerah penangkapan ikan dengan produksi terbesar berada pada rumpon dengan posisi geografi 04026’06,3”LS dan118031’44,8’’BT ; 04030’25.6”LS dan 118029’37,3’’BT. Produktivitas penangkapan menunjukkan tren menurun. Posisi geografi rumpon yang memiliki produksi tuna, cakalang dan tongkol adalah pada posisi 04026’06,3”LS dan 118031’44,8’’BT ; 04030’25.6”LS dan 118029’37,3’’BT.<br /><br />Kata kunci: rumpon, produktivitas penangkapan, pancing ulur, pelagis besar, Majene</p>

scholarly journals Assessment of Levels of Some Metals in Water and Fish from Jos, Plateau State, Nigeria

2019 ◽  
pp. 1-11
Author(s):  
J. D. Dabak ◽  
L. J. Dabal ◽  
A. G. Jakwa ◽  
E. A. Ajiji
Keyword(s):  
Fish Species ◽  
General Pattern ◽  
Clarias Gariepinus ◽  
World Health Organisation ◽  
Water Sources ◽  
The Body ◽  
World Health ◽  
Fish Samples ◽  
Toxicity Risk ◽  
Plateau State

Aim: This study was designed to assess the levels of chromium (Cr), manganese (Mn), cobalt (Co) and nickel (Ni) in water and fish to monitor the toxicity risk of consuming these fish. Place and Duration of Studies: The water and fish samples were obtained from Farin gada river, Liberty Dam, Dahwol-Tohort and Diye-Tohort mining ponds, all within Jos Metropolis, Plateau State, Nigeria, between March and April, 2018. Methodology: Water and six fish species samples were collected from four different locations, digested and analysed using Buck Scientific Atomic Absorption Spectrophotometer, model 210VGP. Results: Farin gada river had all the four metals studied in varying concentrations in the following order Mn>Ni>Co>Cr with Mn having the highest mean concentration of 0.4133±0.0100 mg/L. The concentrations of the metals in the other three sources were in the order of Ni>Co>Cr with Mn not detected. Cr also was not detected in Lamingo Dam. The concentrations of Mn and Ni in all the water sources were higher than the World Health Organisation (WHO) maximum permissible limits of 0.05 mg/L and 0.06 mg/L respectively. Petrocephalus bovei recorded the highest mean concentrations of Mn and Ni, while Co was highest in Clarias gariepinus species. The concentrations of these metals in the head, body and gills of the fish species showed that the head of Petrocephalus bovei species had the highest concentrations of all the metals except chromium. Fish species from other water sources exhibited the same general pattern of Head˃gill˃body except Co which was found to accumulate more in the body than in other parts of the fish. Conclusion: The results showed that there was biomagnification of these metals from water to the fish as the concentration of the metals in the fish far exceeded those of the water sources from which they were obtained and Petrocephalus bovei species has the highest potential to biomagnified all the metals.

scholarly journals Geographical variation in the body size of adult female sperm whales (Physeter macrocephalus) – an example of McNab’s resource rule?

Mammalia ◽  
2017 ◽  
Vol 81 (2) ◽  
Author(s):  
Peter B. Best ◽  
Dmitri Tormosov ◽  
Anabela Brandão ◽  
Yuri Mikhalev
Keyword(s):  
Body Size ◽  
Adult Female ◽  
Geographical Variation ◽  
Size Composition ◽  
The Body ◽  
Physeter Macrocephalus ◽  
Sperm Whales ◽  
Regional Variations

AbstractThis study investigates possible regional variations in size composition of adult female sperm whales (

Bioenergetics of Pelagic Fish: Theoretical Change in Swimming Speed and Ration with Body Size

1978 ◽  
Vol 35 (2) ◽  
pp. 220-228 ◽  
Author(s):  
D. M. Ware
Keyword(s):  
Swimming Speed ◽  
Optimal Foraging ◽  
Sockeye Salmon ◽  
Juvenile Fish ◽  
Size Composition ◽  
Pelagic Fish ◽  
The Body ◽  
Fish Feed ◽  
Unit Energy ◽  
Marine Food

It is shown from hydrodynamics theory and the size composition of particles in marine food chains that there are two unique swimming speeds of importance to pelagic fish: (1) the optimal cruising speed, which maximizes the distance traveled per unit energy expenditure and (2) the optimal foraging speed, which maximizes the rate of flow of surplus energy, or production in its broadest sense. With sockeye salmon (Oncorhynchus nerka) as an example, the optimal cruising and foraging speeds were found to be proportional to the body length raised to the 0.4 power. By analogy, if pelagic fish in general tend to move at either of these speeds, their ration and growth rates relative to the body weight should be proportional to a power that varies between 0.7 and 0.8. These predictions are consistent with field growth measurements for several pelagic species. Therefore, the necessary conditions for a theory of optimal foraging exist since (1) all adaptive swimming speeds are physiologically possible and (2) there is evidence that some juvenile fish feed by moving at the appropriate speed to maximize their production rate. Key words: bioenergetics, swimming speed, optimal foraging

scholarly journals Microplastics in Pelagic and Demersal Fishes of Pantai Baron, Yogyakarta, Indonesia

2020 ◽  
Vol 5 (1) ◽  
pp. 33-49
Author(s):  
Nurul Suwartiningsih ◽  
Indri Setyowati ◽  
Resa Astuti
Keyword(s):  
Digestive Tract ◽  
Demersal Fish ◽  
Pelagic Fish ◽  
Plastic Waste ◽  
The Body ◽  
Exploratory Research ◽  
Whitney Test ◽  
Mann Whitney Test ◽  
Fish Samples ◽  
Type Data

Yogyakarta is the second-largest producer of plastic waste in Indonesia. Plastic waste in the waters can be degraded into microplastics that can enter the body of a fish. This study aimed to determine the presence of microplastics in the digestive tract of several species of fish in Pantai Baron, Yogyakarta, Indonesia. This research was an exploratory research conducted in April-September 2019 at Pantai Baron, Yogyakarta. Two species of each pelagic and demersal fish samples were taken by buying fish caught by fishermen. The digestive tract of fish was extracted with 10% KOH, filtered, then visual identification. Microplastic types were estimated by FT-IR spectrometry. The amount of microplastic of all fishes was done by Kruskal-Wallis test while the number of microplastics of the two categories of fish was compared with the Mann-Whitney test. A correlation analysis was carried out between the length of the fish, the weight of the digestive tract, and the number of microplastics found. Microplastic shape, color, size, and type data were analyzed descriptively. A total of 78 of the 80 (97.50%) fish from four species studied contained microplastics with a total number as many as 3,651 (mean 45.60 ± 44.31 microplastic/individual). About 100% of pelagic fish samples contained microplastics, while only 95% of demersal fish samples contained microplastics. Mann-Whitney test results showed the number of microplastic/ individual was significantly different between pelagic and demersal fish (p <0.05). The most dominant shape of microplastic was fiber (53.14%), film (36.97%) and fragments (9.89%). The type of polymers detected was polyamide. The results showed that pelagic fish swallowed more microplastics than demersal fish did because of the microplastic nature that is lightweight and floats. Microplastic characteristic data can be used to estimate the main source of microplastic pollution in Pantai Baron so it can be managed appropriately.

scholarly journals Allometric relations and consequences for feeding in small pelagic fish in the Bay of Biscay

2012 ◽  
Vol 70 (1) ◽  
pp. 232-243 ◽  
Author(s):  
Eneko Bachiller ◽  
Xabier Irigoien
Keyword(s):  
Body Size ◽  
Prey Size ◽  
Pelagic Fish ◽  
The Body ◽  
Large Prey ◽  
Bay Of Biscay ◽  
Small Pelagic Fish ◽  
Predator Prey ◽  
Allometric Relations ◽  
Gape Size

Abstract Bachiller, E. and Irigoien, X. 2013. Allometric relations and consequences for feeding in small pelagic fish in the Bay of Biscay. – ICES Journal of Marine Science, 70:232–243. The body size of fish is an important factor in determining their biology and ecology, as predators eat prey smaller than themselves. Predator mouth size restricts the availability of possible prey. In this paper we provide the allometric relationships of eight common, small pelagic fish species in the Bay of Biscay. In addition, we describe the predator-prey size ratios for different species, and we determine changes in their ratio-based trophic-niche breadth with increasing body size. Results suggest that gape size does not totally determine the predator-prey size ratio distribution, but predators use the entire available prey size range, including the smallest. As they grow they simply incorporate larger prey as their increased gape size permits. Accordingly, a large degree of overlap was found in the diet composition in terms of size and predator-prey ratios, even between fish of different sizes. Of the species studied, only horse mackerels seem to be clearly specialized in relatively large prey.

scholarly journals Effects of Lake Productivity on Density and Size Structure of Pelagic Fish Estimated by Means of Echosounding in 17 Lakes in Southeast Norway

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3391
Author(s):  
Arne N. Linløkken
Keyword(s):  
Body Size ◽  
Fish Species ◽  
Pelagic Fish ◽  
Fish Density ◽  
Present Species ◽  
Fish Stock ◽  
Small Fish ◽  
Large Species ◽  
Lake Productivity ◽  
Oligotrophic Lakes

Density estimation of pelagic fish was performed by means of single beam echosounding in 17 lakes within a period of 34 years, from 1985 to 2018. Surveys were performed repeatedly (two to fourteen times) in five lakes. The density estimates ranged from 34 to 4720 fish/ha and were significantly correlated with total phosphorus concentration. The high density in relatively phosphorus rich lakes (TP > 10 µg/L) was comprised of small fish (<20 cm) and was partly due to the higher number of pelagic fish species. The number of pelagic species varied from one, Arctic charr, in the most elevated and oligotrophic lakes, and whitefish dominated in less elevated oligotrophic lakes. In lowland lakes characterized as mesotrophic or tending to mesotrophy, smelt, vendace, and two to three cyprinids comprised the pelagic fish stock. These fish species predate zooplankton effectively, and species composition and body size of planktonic cladocerans was affected by fish density. Large species of Daphnia were lacking in lakes with high fish density, and body size of present species, D. galeata, D. cristata, and Bosmina spp. were negatively correlated with pelagic fish density.

scholarly journals Mikroplastik pada Ikan Kembung (Rastrelliger sp.) dan Ikan Selar (Selaroides eptolepis) di TPI Tambak Lorok Semarang dan TPI Tawang Rowosari Kendal

2021 ◽  
Vol 10 (3) ◽  
pp. 251-258
Author(s):  
Juwita Lesly Senduk ◽  
Jusup Suprijanto ◽  
Ali Ridlo
Keyword(s):  
Fish Species ◽  
Research Method ◽  
Pelagic Fish ◽  
Marine Biota ◽  
The Public ◽  
Fish Samples ◽  
Descriptive Qualitative

Mikroplastik merupakan partikel plastik yang berukuran ≤5 mm. Ukurannya yang kecil menyebabkannya dapat tertransportasikan ke seluruh tempat dan biota termasuk ikan. Ikan pelagis jenis ikan kembung dan ikan selar merupakan salah satu biota laut bernilai ekonomis tinggi dan banyak dikonsumsi masyarakat. Penelitian ini bertujuan untuk mengetahui kandungan mikroplastik pada ikan kembung dan ikan selar. Metode penelitian yang digunakan adalah deskriptif kualitatif. Sampel ikan kembung diambil di TPI Tambak Lorok Semarang, sedangkan ikan selar diambil dari TPI Tawang Rowosari Kendal. Penelitian ini dilakukan  pada bulan Juni–Desember 2020. Tahapan penelitian yang dilakukan yaitu dimulai dengan pengambilan sampel, pengukuran sampel, pembedahan sampel, pelarutan sampel, pemisahan partikel mikroplastik, penyaringan partikel, dan identifikasi langsung secara visual menggunakan mikroskop. Hasil penelitian menunjukkan bahwa terdapat mikroplastik pada ikan selar dan kembung di TPI Semarang dan Kendal. Mikroplastik paling banyak dengan rerata 25,2 partikel pada insang dan 19,1 partikel pada pencernaan ditemukan pada ikan kembung di TPI Tambak Lorok, pada ikan selar (Selaroides leptolepis) ditemukan rerata 10,1 partikel pada insang dan 8,4 partikel pada pencernaan. Hasil yang didapatkan ditemukan bentuk fiber, fragmen, pelet, dan film, dengan warna yang beragam yaitu hitam, coklat, biru, putih, merah, transparan, dan kuning.  Microplastics are plastic particles with a size of 5 mm. Its small size causes it easy to be transported to all places, including fish. Pelagic fish species of mackerel and selar fish are one of the marine biota that are economically feasible and widely consumed by the public. This study aims to determine the content of microplastics in mackerel and selar fish. The research method used is descriptive qualitative. Mackerel fish samples were taken at TPI Tambak Lorok Semarang, while selar fish were taken from TPI Tawang Rowosari Kendal. This research was conducted in June – December 2020. The stages of the research carried out were starting with sampling, measuring samples, separating samples, separating microplastic particles, evaluating particles, and directly using a microscope. The results showed that there were microplastics in selar and mackerel in TPI Semarang and Kendal. The most microplastics with an average of 25.2 particles in the gills and 19.1 particles in the digestion were found in mackerel at TPI Tambak Lorok, in selar fish (Selaroides leptolepis) an average of 10.1 particles were found in the gills and 8.4 particles in digestion. The results obtained were found in the form of fibers, fragments, pellets, and films, with various colors, namely black, brown, blue, white, red, transparent, and yellow.

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