scholarly journals NISBAH KELAMIN, UKURAN PERTAMA KALI TERTANGKAP DAN CATCH PER-UNIT EFFORT DUA JENIS LOBSTER KIPAS (SCYLLARIDAE) DI PERAIRAN KUPANG DAN SEKITARNYA

2019 ◽  
Vol 25 (1) ◽  
pp. 27
Author(s):  
Ngurah N Wiadnyana ◽  
Setiya Triharyuni ◽  
Prihatiningsih Prihatiningsih
Keyword(s):  
Sex Ratio ◽  
Catch Per Unit Effort ◽  
Biological Aspect ◽  
Unit Effort ◽  
By Catch

Pemanfaatan lobster kipas (Scyllaridae) yang tertangkap di Perairan Kupang terus meningkat, tetapi informasi mengenai kondisi stok dan aspek biologi nya belum banyak diketahui. Tulisan ini mengkaji nisbah kelamin, rata-rata ukuran pertama kali tertangkap dan catch per-unit of effort (CPUE) lobster kipas di perairan Kupang dan sekitarnya. Kedua spesies lobster kipas yang dianalisis merupakan hasil tangkapan sampingan jaring krendet yang dilakukan oleh nelayan setempat. Jenis data yang dianalisis meliputi data penangkapan dan biologi lobster yang dikumpulkan selama periode Oktober 2015 - Desember 2016. Hasil penelitian menunjukkan bahwa terdapat dua jenis lobster kipas hasil tangkapan sampingan di perairan Kupang, yaitu Scyllarides haanii dan Thenus indicus dengan komposisi hasil tangkapan T. indicus lebih banyak dari S. haanii. Rata-rata ukuran panjang pertama kali tertangkap (Lc) untuk lobster T. indicus betina berdasarkan panjang karapas adalah sekitar 93,79 dan 94,18 mm untuk jantan, sedangkan untuk lobster S. haanii betina adalah 101,40 mm dan 104,06 mm untuk jantan. Nisbah kelamin dari kedua jenis lobster ini masih dalam kondisi seimbang. Rata-rata nilai CPUE lobster jenis T. indicus 3,7 kg/trip lebih besar dibandingkan dengan nilai CPUE S. haanii sebesar 0,8 kg/trip. Nilai CPUE dari tiap-tiap lokasi penangkapan tidak berbeda nyata antar lokasi penangkapan.The utilization of slipper lobster (Scyllaridae) caught in around Kupang waters is increased continuously, however a little information on its stock and biological aspect is available. This paper describes sex ratio, length at first capture and the catch per-unit of effort (CPUE) of the slipper lobster population in the Kupang and surrounding waters. Both slpper lobsters analyzed are a by-catch of a gillnet operated by local fishermen. The data analysized included cacth and biology of lobster collected during the period of October 2015 to December 2016. Results show that there were two types of slipper lobster as by-catch in Kupang waters, namely Scyllarides haanii and Thenus indicus with the number of T. indicus higher than S. haanii. The first lengths of captured (Lc) for female T. indicus based on carapac lenght was 93.79 and 94.18 mm for male, while female S. haanii were 101.40 mm (female) and 104.06 mm for male. The sex ratio of both types of lobsters was still in a balanced condition. The average CPUE of T. indicus was 3.7 kg/trip, higher than that CPUE value of S. haanii of only 0.8 kg/trip. The CPUE value was significantly no different between the fishing location.

scholarly journals Pêche Et Caractéristiques Morphologiques D’un Poisson-Chat Endémique Synodontis Punctifer (Daget, 1964) Dans Le Barrage Électrique De Taabo (Côte d’Ivoire)

2018 ◽  
Vol 14 (15) ◽  
pp. 101
Author(s):  
Hervé Oussou Koffi ◽  
Diaha N’guessan Constance ◽  
Soro Yaya ◽  
N’Da Konan
Keyword(s):  
Sex Ratio ◽  
Condition Factor ◽  
Morphological Characteristics ◽  
Fishing Effort ◽  
Annual Production ◽  
Allometric Growth ◽  
Catch Per Unit Effort ◽  
Large Size ◽  
Unit Effort ◽  
Significant Difference

A study of Synodontis punctifer (family: Mochokidae) of Taabo Lake was conducted from October 2015 to September 2016. This was carried out so as to evaluate its quantity (biomass) caught by fishing and also its morphological characteristics. The fish were caught using gillnets at 4 sites of the lake and different measurements were made. The fishing effort was 23 to 11 fishermen / day in Taabo city, 17 to 11 fishermen / day in Courandjourou, 13 to 5 fishermen / day in Ahondo, and 8 to 3 fishermen / day in Taabo village. The catch per unit effort (CPUE) ranged from 17.7 to 3.7 g / fisherman / day, 9.2 to 1.2 g / fisherman / day, 8.3 to 0.7 g / fisherman /day, 8 to 1g / fisherman / day at Ahondo, Courandjourou, Taabo city and Taabo village, respectively. The overall annual production was estimated at 2199.3 kg, i.e. 817 kg (40%) at Ahondo, 788.3 kg (35%) at Courandjourou, 462.5 kg (20%) at Taabo, and 131.5 kg (5%) in Taabo village. The overall sex ratio (1: 1.33) was in favor of females. Individuals have negative allometric growth at all sites with values ranging from 1.72 to 2.89. The condition factor does not vary significantly between different categories of individuals (ANOVA, F = 2.79, p ˃ 0.05). A significant difference was observed between the average sizes of the individuals of the different sites (test, p˂0,05). The large size specimens were captured at Ahondo, mean (avg = 15.38 ± 1.68 cm FL). In Courandjourou, the sizes were intermediate (avg = 13.63 ± 1.64 cm LF). Smalls sizes have been observed in Taabo city (mean= 12.37 ± 1.24 cm FL) and Taabo village (mean= 15.58 ± 1.58 cm FL).

Experimental fishing for the Spider crab, Maia Squinado: sea and laboratory trials

1984 ◽  
Vol 64 (2) ◽  
pp. 251-259 ◽  
Author(s):  
Deborah M. Rodhouse
Keyword(s):  
Sex Ratio ◽  
West Coast ◽  
Size Composition ◽  
Spider Crab ◽  
Catch Per Unit Effort ◽  
The West ◽  
Summer Peak ◽  
Unit Effort ◽  
Pot Trials ◽  
Rocky Outcrops

Sea trials, using baited pots (inkwell and French barrel) and nets (tangle and gill), were conducted for the spider crab Maia squinado off the west coast of Ireland from November 1978 to July 1980. A series of laboratory pot trials using inkwell pots were performed. Diving observations were made on the fishing grounds.Catch per unit effort rose to a summer peak and decreased in autumn. There was no difference in size composition or sex ratio of the catch between the pots and nets. Mature males predominated in the catch with the highest male:female (M:F) ratios recorded in summer. Immatures were virtually absent from the catch. Segregation on the basis of sex and maturity appears to occur in summer. Mature males were found at about 10 m, in sandy areas with rocky outcrops. Mature females occurred at about 5 m, on a sand and shell gravel bottom with rock and weed (notably Laminaria). Immatures were rare and occurred just below the intertidal. The M:F ratio was lowest during the periods of the onshore and offshore migrations. Berried females were recorded from March to September with one brood produced each year.Laboratory pot trials showed increased aggression among spider crabs in the presence of baited pots. Males drove other males away from pots and divided their time between agonistic encounters and searching. Females were not driven away and did not engage in aggressive encounters. This behaviour, and the observation that large males could reach the bait through the pot bars, possibly explains the absence of larger and smaller males from the pots.

scholarly journals Investigation on species abundance by catch per unit effort (CPUE) in Chalanbeel, Bangladesh

2021 ◽  
Vol 9 (5) ◽  
pp. 56-63
Author(s):  
Md. Asek Uddin ◽  
SM Rezaul Karim ◽  
KM Abdul Halim ◽  
Md. Nawshad Ali ◽  
KM Hasanuzzaman ◽  
...  
Keyword(s):  
Species Abundance ◽  
Catch Per Unit Effort ◽  
Unit Effort ◽  
By Catch

scholarly journals Population dynamics and CPUE of Alosa genus with emphasis on Alosa braschnikovi (Borodin, 1904) on the coasts of Golestan Province, Iran

2018 ◽  
Vol 19 (1) ◽  
pp. 59-66
Author(s):  
ZOBEYDE BIBAK ◽  
SEYYED YOUSEF PAIGHAMBARI ◽  
MOJTABA POULADI ◽  
RASOUL GHORBANI ◽  
SEYYED ABBAS HOSSEINI ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Sex Ratio ◽  
Relative Abundance ◽  
Fish Species ◽  
Age Groups ◽  
Abundant Species ◽  
Catch Per Unit Effort ◽  
Beach Seine ◽  
Unit Effort ◽  
Golestan Province

Bibak Z, Paighambari SY, Pouladi M, Ghorbani R, Hosseini SA, Yahyaei M. 2018. Population dynamics and CPUE of Alosa genus with emphasis on Alosa braschnikovi (Borodin, 1904) on the coasts of Golestan Province, Iran. Biodiversitas 19: 59-66. The aim of this study was to compare relative abundance and catch per unit effort of members of the Alosa genus (family: Clupeidae) in the fishing grounds of Gomishan and Miankale in Golestan coasts. Sampling operations were done by beach seine during 2011 to 2012. A total of 240 fish were collected. Identified species in Gomishan were: Alosa braschnikovi (Borodin, 1904) and A. saposchnikovi (Grimm, 1887). The most abundant species in this region were individuals of A. braschnikovi. The highest length and weight in the region were 35.6±1.85 mm and 447.8±57.43 gr for Alosa braschnikovi in Gomishan. Besides the two mentioned species, A. kessleri (Grimm, 1887) was caught in Miankale coasts. The most abundant species again was Alosa braschnikovi in this region. The highest length and weight were 33.12±3.18 cm and 362.5±99.57 gr for Alosa braschnikovi in Miankale region. The results showed that mean of CPUE in Miankale was higher than in the Gomishan region. The comparison of sex ratio for shads showed that males were dominant against females. Also, the comparison between species showed that the highest values for length, and weight of fish species compared belonged to Alosa braschnikovi. Among the Alosa braschnikovi fishes caught, individuals were in the range of 2 to 5 age groups within the two compared regions and most abundant were observed in 4 age groups.

scholarly journals Pengaruh Anomali Iklim (Enso Dan Iod) Terhadap Sebaran Ikan Pedang (Xiphias Gladius) Di Samudera Hindia Bagian Timur

Jurnal Segara ◽  
2017 ◽  
Vol 13 (1) ◽  
Author(s):  
Bram Setyadji ◽  
Khairul Amri
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Sea Surface ◽  
Dipole Mode ◽  
Catch Per Unit Effort ◽  
Unit Effort ◽  
Moderate Resolution ◽  
Resolution Imaging ◽  
Moderate Resolution Imaging Spectroradiometer ◽  
By Catch

Anomali iklim seperti ENSO dan Dipole Mode mempengaruhi dinamika massa air di bagian timur Samudera Hindia serta berdampak terhadap pola sebaran dan hasil tangkapan ikan. Ikan pedang yang tertangkap di bagian timur Samudera Hindia merupakan hasil tangkap sampingan (by catch) rawai tuna. Meskipun mempunyai nilai ekonomis yang tinggi, penelitian mengenai keterkaitan faktor lingkungan dengan hasil tangkapan dan sebaran ikan pedang, masih belum banyak dilakukan. Tulisan ini membahas pengaruh anomali iklim (ENSO dan Dipole Mode) terhadap sebaran hasil tangkapan dan sebaran spasial-temporal ikan pedang di bagian timur Samudera Hindia. Data paremeter lingkungan yang digunakan berupa sebaran suhu permukaan laut (SPL) atau Sea Surface Temperature(SST) dan klorfil-a permukaan (SSC=Sea Surface Chlorophyll) hasil pengukuran sensor Satelit Aqua MODIS (Moderate Resolution Imaging Spectroradiometer) L-2 dengan format bulanan. Data ikan pedang merupakan data kombinasi hasil pendaratan di Pelabuhan Benoa 2002–2014 dan data pemantauan ilmiah Loka Penelitian Perikanan Tuna  2005–2014. Hasil penelitian menunjukkan bahwa ada anomali iklim yang mempengaruhi hasil tangkapan per upaya (Catch per Unit Effort/CPUE) dan diduga juga mempengaruhi recruitment ikan pedang. Nilai CPUE tahunan tertinggi (0,16 ikan/100 pancing) terjadi pada event El-Nino moderate (2009) dimana terjadi peningkatan produktivitas primer, sebaliknya CPUE tahunan terendah (0,08 ikan/100 pancing) pada event IOD negatif moderate (2005) yang dampaknya sama dengan La-Nina, yakni penurunan produktivitas primer. Indikasi ini diperkuat dengan hasil pengamatan bulanan dimana nilai CPUE tertinggi pada Juni (periode berlangsungnya upwelling di selatan Jawa), sebaliknya pada bulan Desember CPUE rendah (ketika kesuburan perairan menurun). Dominansi hasil tangkapan ikan muda periode 2007-2011, diduga merupakan generasi baru recruitment dari keberhasilan pemijahan sebelumnya, saat terjadi event consecutive IOD positif (tiga tahun berturut-turut: 2006-2007-2008) meningkatkan produktivitas primer secara signifikan akibat intensitas upwelling yang tinggi.

Qarun Lake fisheries; Fishing gears, Species composition and Catch per unit effort

2014 ◽  
Vol 18 (2) ◽  
pp. 39-49
Author(s):  
Sabry El-Serafy ◽  
Alaa El-Haweet ◽  
Azza El-Ganiny ◽  
Alaa El-Far
Keyword(s):  
Species Composition ◽  
Catch Per Unit Effort ◽  
Unit Effort ◽  
Fishing Gears ◽  
Lake Fisheries

scholarly journals Modeling of Lake Malombe Annual Fish Landings and Catch per Unit Effort (CPUE)

Forecasting ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 39-55
Author(s):  
Rodgers Makwinja ◽  
Seyoum Mengistou ◽  
Emmanuel Kaunda ◽  
Tena Alemiew ◽  
Titus Bandulo Phiri ◽  
...  
Keyword(s):  
Time Series ◽  
Information Criterion ◽  
Coefficient Of Determination ◽  
Series Data ◽  
Efficiency Coefficient ◽  
Arima Models ◽  
Catch Per Unit Effort ◽  
Annual Fish ◽  
Unit Effort ◽  
The Mean

Forecasting, using time series data, has become the most relevant and effective tool for fisheries stock assessment. Autoregressive integrated moving average (ARIMA) modeling has been commonly used to predict the general trend for fish landings with increased reliability and precision. In this paper, ARIMA models were applied to predict Lake Malombe annual fish landings and catch per unit effort (CPUE). The annual fish landings and CPUE trends were first observed and both were non-stationary. The first-order differencing was applied to transform the non-stationary data into stationary. Autocorrelation functions (AC), partial autocorrelation function (PAC), Akaike information criterion (AIC), Bayesian information criterion (BIC), square root of the mean square error (RMSE), the mean absolute error (MAE), percentage standard error of prediction (SEP), average relative variance (ARV), Gaussian maximum likelihood estimation (GMLE) algorithm, efficiency coefficient (E2), coefficient of determination (R2), and persistent index (PI) were estimated, which led to the identification and construction of ARIMA models, suitable in explaining the time series and forecasting. According to the measures of forecasting accuracy, the best forecasting models for fish landings and CPUE were ARIMA (0,1,1) and ARIMA (0,1,0). These models had the lowest values AIC, BIC, RMSE, MAE, SEP, ARV. The models further displayed the highest values of GMLE, PI, R2, and E2. The “auto. arima ()” command in R version 3.6.3 further displayed ARIMA (0,1,1) and ARIMA (0,1,0) as the best. The selected models satisfactorily forecasted the fish landings of 2725.243 metric tons and CPUE of 0.097 kg/h by 2024.

Environmental drivers of golden tilefish ( Lopholatilus chamaeleonticeps ) commercial landings and catch‐per‐unit‐effort

2021 ◽  
Author(s):  
Geneviève Nesslage ◽  
Vyacheslav Lyubchich ◽  
Paul Nitschke ◽  
Erik Williams ◽  
Churchill Grimes ◽  
...  
Keyword(s):  
Environmental Drivers ◽  
Catch Per Unit Effort ◽  
Unit Effort

Ecological and environmental factors affecting the foraging activity of the White-bellied Heron Ardea insignis (Hume, 1878) in Bhutan

2021 ◽  
pp. 1-18
Author(s):  
PEMA KHANDU ◽  
GEORGE A. GALE ◽  
SARA BUMRUNGSRI
Keyword(s):  
Relative Abundance ◽  
Habitat Restoration ◽  
Prey Species ◽  
Catch Per Unit Effort ◽  
Factors Affecting ◽  
Prey Biomass ◽  
Gravel Mining ◽  
Unit Effort ◽  
Prey Preferences ◽  
The Government

Summary White-bellied Heron Ardea insignis (WBH) is critically endangered, but we lack data on many aspects of its basic ecology and threats to the species are not clearly understood. The goal of this study was to analyse WBH foraging microhabitat selection, foraging behaviour, and prey preferences in two river basins (Punatsangchhu and Mangdechhu) in Bhutan which are likely home to one of the largest remaining populations of WBH. We also explored the relationship between the relative abundance of the WBH and prey biomass catch per unit effort within four foraging river microhabitats (pool, pond, riffle and run). Prey species were sampled in 13 different 100-m thalweg lengths of the rivers using cast nets and electrofishing gear. Riffles and pools were the most commonly used microhabitats; relative abundance was the highest in riffles. The relative abundance of WBH and prey biomass catch per unit effort (CPUE) also showed a weak but significant positive correlation (rs = 0.22). The highest biomass CPUE was observed in riffles while the lowest was found in the ponds. From the 97 prey items caught by the WBH, 95% of the prey were fish. The WBH mainly exploited three genera of fish (Garra, Salmo, and Schizothorax) of which Schizothorax (64%) was the most frequently consumed. This study provides evidence in support of further protection of critical riverine habitat and fish resources for this heron. Regular monitoring of sand and gravel mining, curbing illegal fishing, habitat restoration/mitigation, and developing sustainable alternatives for local people should be urgently implemented by the government and other relevant agencies. Further study is also required for understanding the seasonal variation and abundance of its prey species in their prime habitats along the Punatsangchhu and Mangdechhu basins.

Modelling catch per unit effort of the Black Volta near the Bui dam in Ghana

2016 ◽  
Vol 55 (2) ◽  
pp. 126-133
Author(s):  
Elliot H. Alhassan ◽  
Patrick K. Ofori-Danson ◽  
Francis K. E. Nunoo
Keyword(s):  
Catch Per Unit Effort ◽  
Unit Effort
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