نتایج جستجو برای: fishing effort

تعداد نتایج: 129837  

2001
Leesa King

A survey of recreational boat-based and shore-based fishing in the Swan-Canning Estuary Basin was conducted between August 1998 and July 1999. During the survey 1,302 interviews were conducted at boat ramps. The majority of these (62%) were not involved in fishing or crabbing activities, with a further 18 per cent fishing in the adjacent ocean. Of the remainder, 139 boats had been crabbing and ...

1996
Xi He Keith A. Bigelow Christofer H. Boggs

In the Hawaii-based longline fishery, changes in fishing operations to target different species produce changes in the effectiveness of fishing effort units. Catch-per-unit-effort (CPUE) indices used in resource monitoring were improved by segregating dissimilar types of fishing effort. Cluster analysis was used to classify longline sets in relation to species composition of the catches. Based ...

2007
Sophie Véran SOPHIE VÉRAN OLIVIER GIMENEZ ELIZABETH FLINT WILLIAM L. KENDALL PAUL F. DOHERTY

1. Industrial longline fishing has been suspected to impact upon black-footed albatross populations Phoebastria nigripes by increasing mortality, but no precise estimates of bycatch mortality are available to ascertain this statement. We present a general framework for quantifying the relationship between albatross population and longline fishing in absence of reliable estimates of bycatch rate...

ژورنال: بوم شناسی آبزیان 2014
Paighambari, Seyed Yousef , Raeisi, Hadi , Rezaei, Sedighe , Shabani, Mohamad Javad ,

This study was performed to estimate the growth parameters and mortality rate of (Nemipterus japonicus Bloch, 1971) with using length frequency data in Bushehr fishing grounds. sampling did monthy with using cutlassfish pelagic trawl, gillnet and bottem trawl. The growth parameters of k and L∞ were estimated 0.79 y-1 and 31.5 cm respectively. The t0 was estimated -0.2. b quantity for this spe...

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2011
J T Mendonça T M Bonfante

There is intense fishing activity, mainly artisanal, in the Cananéia, Iguape and Ilha Comprida Estuarine System. White mullet (Mugil curema) is one of the local fishery resources and is usually caught with gillnets and fish traps. This study aimed to characterise the Mugil curema fisheries thereby underpinning the management of the species in the region. The study was developed with data collec...

2004
Michael J. Wilberg Charles R. Bronte Michael J. Hansen

Understanding fishing fleet dynamics is important when using fishery dependent data to infer the status of fish stocks. We analyzed data from mandatory catch reports from the commercial lake trout (Salvelinus namaycush) fishery in Michigan waters of Lake Superior during 1929–1961, a period when lake trout populations collapsed through the combined effects of overfishing and sea lamprey (Petromy...

2008
Elisabeth Slooten

Middleton et al. (2007) argue that some of the modelling choices in my analysis of Hector’s dolphin Cephalorhynchus hectori bycatch (Slooten 2007) lead to an overestimation of the impact of fishing on this species and of the potential for population recovery if fishing mortality were reduced to zero. This reply explains the rationale behind the model choices in more detail and shows that they d...

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2007
V S Batista M Petrere Junior

Fishing resources are important generators of income and food for the rural and urban people in the Amazon. The present paper investigates fishing and environmental variables determining fishing production landed in Manaus and evaluates the relative abundance of commercial fishes in the different sub-systems of the Central Amazon basin. Information collected was used to test the new catch index...

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