Investigating bias in recreational fishing surveys: Fishers listed in public telephone directories fish similarly to their unlisted counterparts

Ide Leuciscus idus (Linnaeus, 1758) belongs to Cyprinidae family and is used in commercial and recreational fishing. Ide is an intermediate host of Opisthorchis felineus . In the control catches (summer 2015, the Lower Irtysh, Uvatsky, Tobolsky and Vagaysky regions of Tyumenskaya Oblast’) there were observed species with lengths 11.9-38.1 cm, with a total weight 45-1085 g. Some species aged 9 years old and even older. The maximum rate of linear growth was registered in ide species younger than 3 years old, at this age annual growth made 5 cm. The annual growth of four-year-old females made 5.4 cm, males - 2.8 cm. Females aged 3+ exceeded males in body weight and length. Species at the age 1+…2+ years old added 204.6% in their mass; at the age 2+…3+ years old - 65.3%, at 3+…4+ years old - 29.4%. Gender and gonad maturity were determined in species older than 2+, but not in all species. Among females aged 2+…4+ there were found species with I and II stage of gonad maturity. Females aged 5+ were spawned-out species having VI-II stage of gonad maturity (48%); female species aged 6+ having IV stage of gonad maturity made 33.4%. Among males in the age groups of 2+ and 3+ there were registered species with I stage (38.5 and 20%, respectively) and II stage (61.5 and 80%, respectively) of maturation only. Fatness degree of studied species ranged from 0 to 5. Species aged 2+ had I stage (24% species); in the aged groups the proportion of such species decreased (5+ years old - 7.8%; 6+ years old - 12.1%; 8+ years old - 5.9%); species aged 2-7 had II stage of fatness; proportion of older species also decreased. Species with III and IV stage of fatness were found more often (III stage was observed in 100% of the fish species at the age of 1+). Proportion of species with V stage was minor, it increased with age. According to the analysis of the study results, nutritive base in the basin is found satisfactory for ide growth and development.

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Faculty Opinions recommendation of Impacts of recreational fishing in Australia: historical declines, self-regulation and evidence of an early warning system.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.718635471.793499603 ◽

2014 ◽

Author(s):

Fabio Bulleri

Keyword(s):

Early Warning ◽

Early Warning System ◽

Self Regulation ◽

Warning System ◽

Recreational Fishing

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The value of recreational fishing in Sweden – Estimates based on a nationwide survey

Fisheries Management and Ecology ◽

10.1111/fme.12484 ◽

2021 ◽

Author(s):

Ola Carlén ◽

Göran Bostedt ◽

Runar Brännlund ◽

Lars Persson

Keyword(s):

Nationwide Survey ◽

Recreational Fishing

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Giant otter Pteronura brasiliensis density and abundance in Llanos Orientales de Colombia in the Orinoco basin

Oryx ◽

10.1017/s0030605320000058 ◽

2020 ◽

pp. 1-4

Author(s):

Germán Garrote ◽

Beyker Castañeda ◽

Jose Manuel Escobar ◽

Laura Pérez ◽

Brayan Marín ◽

...

Keyword(s):

South America ◽

Population Size ◽

20Th Century ◽

Conservation Status ◽

Species Conservation ◽

Iucn Red List ◽

Red List ◽

Recreational Fishing ◽

Pteronura Brasiliensis ◽

Direct Counts

Abstract The giant otter Pteronura brasiliensis, categorized as Endangered on the IUCN Red List, was once widely distributed throughout South America. By the middle of the 20th century the giant otter had become locally extinct along the main rivers of the Orinoco basin. Although some populations seem to have recovered, the paucity of information available does not permit a full evaluation of the species' conservation status. The objective of this study was to estimate the abundance and density of the giant otter population along the Orinoco river in the municipality of Puerto Carreño, Vichada, Colombia, where there is important commercial and recreational fishing. Thirty-nine linear km were surveyed, repeatedly, with a total of 315 km of surveys. Population size was estimated by direct counts of individuals. All individuals detected were photographed and identified individually from their throat pelage patterns. In total, 30 otters were identified, giving a minimum density of 0.77 individuals per km, one of the highest reported for the species in Colombia. Given the high density in this well-developed area, our results highlight the importance of this population for the conservation of the species.

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Preface: A Nested Logit Model of Recreational Fishing Demand in Alaska

Marine Resource Economics ◽

10.1086/mre.24.2.42731374 ◽

2009 ◽

Vol 24 (2) ◽

pp. 99-100

Author(s):

GEORGE R. PARSONS ◽

JAMES L. ANDERSON

Keyword(s):

Logit Model ◽

Recreational Fishing ◽

Nested Logit ◽

Nested Logit Model

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A Narrative Approach to Corporate Relations: The Historical Background on Telenor’s Success

Enterprise & Society ◽

10.1017/eso.2020.66 ◽

2021 ◽

pp. 1-36

Author(s):

SVERRE A. CHRISTENSEN

Keyword(s):

Business Strategy ◽

Historical Background ◽

Narrative Approach ◽

Societal Values ◽

Self Interest ◽

Equipment Supplier ◽

Supplier Relations ◽

Telecom Sector ◽

Public Telephone

This article examines the development of buyer-supplier relations in the telecom sector. The literature on telecoms in Scandinavia has been dominated by the narrative praising the trusting and collaborative relations between Telia, the Swedish public telephone operator (PTO), and Ericsson, the equipment supplier. The Norwegian PTO, Telenor, diverted from this path and was a pioneer in preferring competitive tenders and arm’s length relations with its suppliers starting in the 1970s. The article argues that Telenor’s history and nationality had a significant impact on its business strategy. In addition, the article examines why some business narratives persist while others remain unknown. One finding is that shareholder-friendly narratives have a handicap because they focus on self-interest and money, and not societal values.

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