Results 261 to 270 of about 42,684 (308)

Fisheries catch statistics

, 1969
The rational management of Uganda's fishery depends largely on knowledge of fish production in all its aspects, gained by the collection of statistics at fish landings by Fisheries Assistants. Whatever developments may occur, and whatever the calibre of staff in the future, it will remain essential to collect production and marketing statistics as a ...
Stoneman, J.
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Possible statistics for evaluating OMP performance with respect to catch projections.

, 2018
A few suggestions for possible TAC statistics are provided, where examples of these statistics are calculated for an equally weighted average across the nine RS models, for the four different CMP options (150 cap, 160 cap, 150 cap with b+10%, 160 cap with b+10%).
Ross-Gillespie, Andrea, Butterworth, Doug S   +1 more
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Catch statistics in the bloodworm fishery in Maine

Fisheries Research, 2009
Abstract Though they are of critical importance as tools for fisheries managers, catch statistics of small-scale artisanal fisheries are rare. The bloodworm ( Glycera dibranchiata ) fishery in Maine has lacked catch data since the 1970s, and the extent of the disturbance to the mudflats from which they are dug has never been examined.
Eben Sypitkowski, William G. Ambrose, Curtis Bohlen, Joseph Warren   +3 more
openaire   +1 more source

Improving fishery catch statistics for Lake Victoria

Aquatic Ecosystem Health & Management, 2003
The fisheries of Lake Victoria are highly dispersed and catch statistical information is insufficient for supporting management. Catch assessment surveys for the three riparian countries were found to be weak or inadequate and a strategy for improving this source of information is proposed.
I. G. Cowx, M. van der Knaap, L. I. Muhoozi, A. Othina   +3 more
openaire   +1 more source

Using Catch Statistics to Investigate Effects of Seismic Activity on Fish Catch Rates

2012
Norway has been a petroleum nation for several decades, with most of its offshore activities originally concentrated in the North Sea. As these reserves diminish, focus is shifting to areas further north, some of which, particularly the Lofoten/Vesteralen area, are crucial for the reproduction of major fish stocks such as Gadus morhua (northeastern ...
Aud, Vold, Sven, Løkkeborg, Maria M, Tenningen   +2 more
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Statistical Catch-at-Age Methods

1992
In the last chapter, we saw how historical stock sizes and fishing mortality rates could be estimated from catch-at-age data and an assumed natural mortality rate using vpa. There are two major problems with vpa: it can give unreliable estimates for cohorts that have not completely disappeared from the fishery, and it requires an assumption about the ...
Ray Hilborn, Carl J. Walters
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A simple statistical method for catch comparison studies

Fisheries Research, 2009
For analysing catch comparison data, we propose a simple method based on Generalised Linear Mixed Models (GLMM) and use polynomial approximations to fit the proportions caught in the test codend. The method provides comparisons of fish catch at length by the two gears through a continuous curve with a realistic confidence band.
Holst, René, Revill, Andrew S
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Is catch proportional to nominal effort? Conceptual, fleet dynamic, and statistical considerations in catch standardization

Canadian Journal of Fisheries and Aquatic Sciences, 2019
Often, catch-per-unit-effort (CPUE) standardizations are used to reflect fish abundance. This implies that catch is directly proportional to effort. We examine this using 78 reported catch and effort series in a meta-analysis, correcting for errors-in-variables in the relationship.
Aljafary, Michelle, Gillis, Darren M, Comeau, Peter   +2 more
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Prediction of fish catch in the Danube River based on long-term variability in environmental parameters and catch statistics

Science of The Total Environment, 2017
The effects of physical factors on fish catch in the Serbian part of the Danube River were studied for period of six decades. The data on total catch for the Danube River from river kilometre 845 to river kilometre 1433 were collected from Statistical Office of the Republic of Serbia, while water level and water temperature data were collected from 16 ...
Smederevac-Lalić, Marija M., Kalauzi, Aleksandar J., Regner, Slobodan B., Lenhardt, Mirjana, Naunović, Zorana Z., Hegediš, Aleksandar E.   +5 more
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Statistical analysis of catch-at-age data with correlated errors

Canadian Journal of Fisheries and Aquatic Sciences, 1995
We extend the statistical model used to estimate abundance from commercial catch-at-age data for many of the major commercial fish species in the world. The model we consider combines commercial catch-at-age data and research survey estimates of fish abundance; we extend the model to allow correlated errors among ages within a year for the survey ...
Ransom A. Myers, Noel G. Cadigan
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