Reliability of a model based on a short fishery statistics survey: application to the Northeast Atlantic monkfish fishery

Abstract A model based on a short fishery statistics survey was applied to estimate catch and catch per unit effort (cpue) of the Galician monkfish (Lophius spp.) trawl fleet during 1998. In all, 35 interviews were conducted with fisheries personnel in ICES Divisions IXa, VIIIc, VIIId, and VIIIe (coastal offshore fishing grounds) and 44 in VIIb, VIIc, VIIj, and VIIk (Grand Sole fishing ground). Reliability of the model estimates was tested using: (i) registered fish market landings at 38 ports; (ii) landings data from sale invoices at six of these ports (93.8% of total landings of the species); (iii) 29 observers' trips made on board coastal offshore trawlers and the logbook of one Grand Sole trawler. Estimated mean total catch from the model was 5110 t (602 t coastal offshore, 4508 t in Grand Sole) and cpue values were 36.2 kg haul−1 vessel−1 coastal offshore and 104.4 kg haul−1 vessel−1 Grand Sole. Differences between the values of cpue estimated by the model and those determined directly in both fisheries were not significant. However, there were differences between the total catch estimated by the model and the total landings deduced from sale invoices and Galician fish market information.

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The effect of escape gaps of cylinder folding traps on fish catch at the coastal waters of Tuban Regency

E3S Web of Conferences ◽

10.1051/e3sconf/202132203002 ◽

2021 ◽

Vol 322 ◽

pp. 03002

Author(s):

Farrel Nafis Adyatama ◽

Ghassan Nurul Huda ◽

Nahla Alfiatunnisa ◽

Faizal Rachman ◽

Supardjo Supardi Djasmani ◽

...

Keyword(s):

Coastal Waters ◽

Marine Organisms ◽

Total Weight ◽

Total Catch ◽

Catch Per Unit Effort ◽

Unit Effort ◽

Significant Difference ◽

Fish Catch ◽

Swimming Crabs

The purpose of this study is to determine the effect of the escape gap of cylinder folding trap on catch per unit effort (CPUE), trap rate, composition, and size of fish caught in the coastal waters of Tuban Regency. The research was conducted in November 2019 by deploying 60 units in ten experimental fishing trips at different locations. The traps were 20 units without escape gap, 20 units with an escape gap of 3 cm x 6 cm, and 20 units with an escape gap of 4 cm x 7 cm. Overall, the experiments resulted in a collection of 22 species of marine organisms, such as swimming crabs (33% of total weight), snails, shrimps, crabs, fishes (55% of total weight), and cuttlefish. The highest CPUE was found for the traps with escape gaps of 4 cm x 7 cm, i.e., 9.18 gr/trap/trip. There was no significant difference in the total catch, the weight of catches, trap rate, and catch per unit effort (CPUE) among the three types of traps.

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Effect of hook and bait type on catch per unit effort in the Aegean Sea demersal longline fishery

Ege Journal of Fisheries and Aquatic Sciences ◽

10.12714/egejfas.38.2.07 ◽

2021 ◽

Vol 38 (2) ◽

pp. 181-188

Author(s):

Ozan Soykan ◽

Cemil Sağlam ◽

İlker Aydın ◽

Hasan Tuncay Kınacıgil

Keyword(s):

Sparus Aurata ◽

Length Distribution ◽

Aegean Sea ◽

Fishing Effort ◽

Longline Fishery ◽

Total Catch ◽

Catch Per Unit Effort ◽

Unit Effort ◽

Catch Composition ◽

The Impact

This study aimed to determine the impact of hook and bait type on the catch composition and catch per unit effort. Effects of hook and bait types on catch composition, catch per unit effort (CPUE), length and weight distributions in demersal longline fishery were determined by experimental surveys on demersal longline sets in the Aegean Sea. A total of 12 samplings corresponding to 4800 hook fishing effort were performed between April 2014 and September 2014. Two bait types; sardine (Sardina pilchardus) and grooved razor shell (Solen marginatus) and two hook types; J-hook and C-hook were tested. CPUE values were calculated for each species and assessed between different hook-bait combinations. A total of 623 individuals were captured belonging to 3 families and 9 species. It was found that more than 60% of total catch was captured by grooved razor shell and more than 50% of the total catch was caught with J type hook. J hook was found to be close to significant (p=0.06) and grooved razor shell was found significant (p=0.02) for CPUE. The effect of bait type was found to be more significant than that of hook type for CPUE and length distribution. Hook-bait combination differed according to species and C hook baited with sardine was determined to be the best combination for Sparus aurata as the most targeted fish in the study area. Discard ratio was calculated to be 34% in terms of weight and 42.5% in terms of total number of individuals for pooled data. The condition value (K) of the species ranged from 1.05 to 1.68 and differed according to bait type. Most of the high commercial value species caught with any hook-bait combination experimented within this study are larger than minimum fishing length according to minimum landing size regulations of Turkish fishery and maturity studies.

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VARIASI HASIL TANGKAPAN IKAN DARI PERAIRAN SAMUDERA HINDIA, YANG DIDARATKAN DI PPN SIBOLGA PANTAI BARAT SUMATERA TAHUN 2019

TRITON : Jurnal Manajemen Sumberdaya Perairan ◽

10.30598/tritonvol17issue2page68-76 ◽

2021 ◽

Vol 17 (2) ◽

pp. 68-76

Author(s):

Ria R Manik ◽

Ewin Handoco ◽

Jogi Arleston

Keyword(s):

Fishing Ground ◽

Skipjack Tuna ◽

Business Unit ◽

Catch Per Unit Effort ◽

The West ◽

Monthly Average ◽

Research Material ◽

Unit Effort ◽

West Sumatra ◽

The Indian Ocean

Overfishing and overcapacity is a problem for the sustainability of capture fisheries development. Indonesia has experienced overfishing or called overfishing and overcapacity or called excess fishing capacity. The west coast of the island of Sumatra has enormous fishing potential, both in territorial waters and in ZEE waters. The purpose of the study was to understand the trend of fluctuations in fish catches in the waters of West Sumatra. Assessing the effect of boat trips on fish catches in the waters of West Sumatra and providing basic information and management of fisheries in the waters of West Sumatra. The research material used is Catch per Unit Effort (CPUE) data. The overall data was monthly average data in 2019 with fishing ground areas in the Western waters of Sumatra, the Indian Ocean. The results showed the composition of catches in the waters of West Sumatra landed in PPN Sibolga there are three dominant types of fish, namely skipjack tuna 14.566.140 kg (49.90%), decapterus 6.404.470 kg (21.94%) and tunny 2.480.880 kg (8.50%), The dynamics of fish catches in PPN Sibolga in 2019 were highest in May at 3.945.143 kg and June was the lowest catch month of 1.093.292 kg and the average monthly catch in 2019 was 2.508.436 kg, the catch per business unit landed in PPN Sibolga in 2019 obtained the highest CPUE of 8.474 kg/trip (July 2019) and the lowest 1,755 kg/trip (June 2019). ABSTRAK Overfishing dan overcapacity erupakan masalah keberlanjutan pembangunan perikanan tangkap. Indonesialah mengalami overfishing atau disebut penangkapan berlebih dan overcapacity atau disebut kelebihan kapasitas penangkapan. Pantai Barat Pulau Sumatera memiliki potensi perikanan yang sangat besar, baik perairan teritorial maupun perairan ZEE. Tujuan dari penelitian adalah untuk memahami trend fluktuasi hasil tangkapan ikan di Perairan Barat Sumatera, mengkaji pengaruh trip kapal dengan hasil tangkapan ikan di Perairan Barat Sumatera dan memberikan informasi dasar dan pengelolaan perikanan di Perairan Barat Sumatera. Materi penelitian yang digunakan adalah data Catch per Unit Effort (CPUE). Keseluruhan data merupakan data rata-rata bulanan tahun 2019 dengan daerah fishing ground Perairan Barat Sumatera Samudera Hindia. Hasil penelitian menunjukkan komposisi hasil tangkapan di Perairan Barat Sumatera yang didaratkan di PPN Sibolga terdapat tiga jenis ikan yang dominan yaitu cakalang 14.566.140 kg (49,90%), layang 404.470 kg (21,94%) dan tongkol 2.480.880 kg (8,50%), Dinamika hasil tangkapan ikan di PPN Sibolga di tahun 2019 tertinggi terjadi pada bulan Mei sebesar 3.945.143 kg dan bulan Juni merupakan bulan hasil tangkapan terendah yaitu 1.093.292 kg dan rata-rata hasil tangkapan bulanan tahun 2019 adalah 2.508.436 kg, Hasil tangkapan per-unit usaha yang didaratkan di PPN Sibolga di tahun 2019 didapatkan CPUE tertinggi yaitu 8.474 kg/trip (Juli 2019) dan terendah 1.755 kg/trip (Juni 2019). Kata Kunci: CPUE, penangkapan berlebih, penangkapan ikan, PPN Sibolga, Perairan Barat Sumatera

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Proposed approaches to systematic planning of research and monitoring to support a South African inland fisheries policy

Water SA ◽

10.17159/wsa/2021.v47.i3.11865 ◽

2021 ◽

Vol 47 (3 July) ◽

Author(s):

S Hugo ◽

OLF Weyl

Keyword(s):

Land Use ◽

South African ◽

Catch Per Unit Effort ◽

Inland Fisheries ◽

Model Based ◽

Human Land Use ◽

Unit Effort ◽

Fisheries Policy ◽

Systematic Planning

A South African inland fisheries policy will depend on a reliable long-term supply of social-ecological data covering freshwater fisheries at a broad geographic scale. Approaches to systematic planning of research and monitoring are demonstrated herein, based on a fishery-independent gillnet dataset covering 44 dams, and geographic information system maps of monthly and annual climate variables, human land use, and road access in a 5 km zone around 442 dams. Generalised linear mixed models were used to determine the covariates of gillnet catch per unit effort. Such covariates are required for a model-based process to select a subset of state-owned dams for a long-term fishery survey programme. The models indicated a monthly climate influence on catch per unit effort and climatic drivers of fish species distributions. However, unexplained variation is overwhelming and precludes a model-based survey design process. Non-hierarchical clustering of 442 dams was then done based on annual climate and human land use variables around dams. The resulting clusters of dams with shared climate and land use characteristics indicates the types of dams that should be selected for monitoring to represent the full range of climate and land use characteristics. Surrounding land use could indicate the socioeconomic characteristics of fisheries, for example, dams that may support subsistence-based communities that require increased research effort. Finally, although primary catchments could be useful for organising national-scale management, land use cover in the 5 km zone around dams varied widely within the respective primary catchments. Beyond these proposed approaches to plan research, this study also reveals various data deficiencies and recommends additional future studies on other possible methods for systematic research planning.

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Preliminary assessments of stocks of the Western Australian crayfish, Panulirus cygnus George

Marine and Freshwater Research ◽

10.1071/mf9660093 ◽

1966 ◽

Vol 17 (1) ◽

pp. 93 ◽

Cited By ~ 6

Author(s):

BK Bowen ◽

RG Chittleborough

Keyword(s):

Western Australia ◽

Fishing Effort ◽

Total Catch ◽

Catch Per Unit Effort ◽

Stock Size ◽

Unit Effort ◽

Exploitation Rate ◽

Panulirus Cygnus ◽

Western Australian ◽

Closed Period

Total catch of Panulirus cygnus in Western Australia rose from 0.6 million lb in 1944-45 to 21.4 million Ib in 1962-63. Fishing effort increased rapidly with the result that the catch per unit effort declined progressively. Effort has been limited by regulation since 1963. From records of catch and effort from specified areas at intervals of one month throughout each season, estimates were made of mortality coefficients (Z1, F, and M1) and catchability coefficient (q). Stock size, recruitment, and exploitation rates were then estimated. As the seasonal catch per unit effort followed the same trend throughout all fishing areas, the detailed results from the selected areas have been applied to the whole fishery. The fishable stock, originally of approximately 140 million lb, had declined to some 35 million lb by 1963. Exploitation rate rose as effort was increased, and then levelled off (generally at above 60%), further increase in fishing effort resulting in a fall in the catchability coefficient rather than a change in the exploitation rate. Because of the high exploitation rate in recent years, the fishable stock available on the grounds at the opening of a season is largely dependent on recruitment (by growth) of juveniles during the preceding closed period. This recruitment has been diminishing from year to year, apparently because of mortality of undersize (pre-recruit) crayfish handled in fishing pots. Provision of escape gaps in all fishing pots is recommended. A sustainable level of catch might be 16,000,000±2,000,0001b per year if recruitment can be stabilized. Some further restriction of fishing effort might be necessary.

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Current status of the spiny lobster, Panulirus argus, fishery in the Los Roques Archipelago National Park, Venezuela

Marine and Freshwater Research ◽

10.1071/mf01212 ◽

2001 ◽

Vol 52 (8) ◽

pp. 1615

Author(s):

Mario Yallonardo ◽

Juan M. Posada ◽

Daniella M. Schweizer ◽

...

Keyword(s):

Size Distribution ◽

National Park ◽

Spiny Lobster ◽

Panulirus Argus ◽

Current Status ◽

Total Catch ◽

Catch Per Unit Effort ◽

Fishing Season ◽

Unit Effort ◽

Lobster Fishery

Los Roques Archipelago National Park traditionally accounts for 95% of the total Venezuelan catch of Panulirus argus. Lobsters are caught in traps and by skin divers, during a 6-month fishing season (1 November to 31 April). The current status of the fishery was evaluated through a comparison of the 1998–99 lobster fishing season with previous studies. Thirty trap licences and 41 skin-diving authorizations were granted in 1998–99. Catch per unit effort was estimated as 2.31 kg/trap/month and 155.66 kg/diver/month, values similar to those from the 1983–1985 and 1986–1988 seasons. Total catch for the 1998–99 season was estimated as 139.31 tonnes (67.1% from traps), 47.78% higher than official reports. Estimated total catch, however, decreased by 40% from previous scientific evaluations. This decline has been attributed to a reduction in numbers of both trap licences and active traps. Size distribution of the 665 lobsters examined was not statistically different from that found in previous studies. The similarities in catch per unit effort and size distribution between the fishing seasons 1983–1985, 1986–1988, and the present study reflect a relatively stable fishery. The spiny-lobster fishery remains the main source of income of the fishers in the archipelago.

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

Egyptian Journal of Aquatic Biology and Fisheries ◽

10.21608/ejabf.2014.2204 ◽

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

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

Forecasting ◽

10.3390/forecast3010004 ◽

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.

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

Fisheries Oceanography ◽

10.1111/fog.12540 ◽

2021 ◽

Author(s):

Geneviève Nesslage ◽

Vyacheslav Lyubchich ◽

Paul Nitschke ◽

Erik Williams ◽

Churchill Grimes ◽

...

Keyword(s):

Environmental Drivers ◽

Catch Per Unit Effort ◽

Unit Effort

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

Bird Conservation International ◽

10.1017/s0959270920000684 ◽

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.

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