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SOME STATISTICAL TECHNIQUES FOR ESTIMATING ARUNDANCE INDICES FROM TRAWL SURVEYS by
"... Methods are presented for estimating an index of relative abundance from trawl survey catch per tow data. The estimated variance of the index takes into account the within survey variahility in catch and possible yearly changes in catchahility. Applying the techniques to a seri€s of surveys for yell ..."
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Methods are presented for estimating an index of relative abundance from trawl survey catch per tow data. The estimated variance of the index takes into account the within survey variahility in catch and possible yearly changes in catchahility. Applying the techniques to a seri€s of surveys
Catches
"... Based on current biological reference points, offshore hake (Merluccius albidus) is not overfished and overfishing is unknown. Based on NEFSC fall bottom trawl survey data for 2007-2009, the three year delta individual mean weight index (0.16 kg/individual) is below the management threshold (0.24 kg ..."
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Based on current biological reference points, offshore hake (Merluccius albidus) is not overfished and overfishing is unknown. Based on NEFSC fall bottom trawl survey data for 2007-2009, the three year delta individual mean weight index (0.16 kg/individual) is below the management threshold (0
Comparisons of Trawl and Longline Catches of Deepwater
"... A comparison was made between catches from deepwater trawl and longline surveys (1993–2000) in the Northeast Atlantic. Longline catches were dominated by elasmobranchs, particularly squalid sharks and species numbers were low. Trawl catches had higher species numbers, with more teleosts, though elas ..."
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A comparison was made between catches from deepwater trawl and longline surveys (1993–2000) in the Northeast Atlantic. Longline catches were dominated by elasmobranchs, particularly squalid sharks and species numbers were low. Trawl catches had higher species numbers, with more teleosts, though
li a d a p
"... how trawl survey catch per unit eVort (c.p.u.e.) data should be used to estimate abundance of groundfish and problem. However, other authors, such as Myers and Pepin t the riate it is that mal-used ibu-tion dure two Two ..."
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how trawl survey catch per unit eVort (c.p.u.e.) data should be used to estimate abundance of groundfish and problem. However, other authors, such as Myers and Pepin t the riate it is that mal-used ibu-tion dure two Two
Relative efficiency of two bottom trawls in catching juvenile and commercial sized flatfish
- in the Gulf of
, 1984
"... The relative efficiencies of a No. 36 Yankee shrimp trawl and a No. 41.5 Yankee otter trawl in catching three species of flatfishes (witch flounder, American plaice and Greenland halibut) were compared from data collected during research-vessel surveys of the northeastern Gulf of St. Lawrence. The s ..."
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The relative efficiencies of a No. 36 Yankee shrimp trawl and a No. 41.5 Yankee otter trawl in catching three species of flatfishes (witch flounder, American plaice and Greenland halibut) were compared from data collected during research-vessel surveys of the northeastern Gulf of St. Lawrence
CATCH RATES AND SUSTAINABLE YIELD OF THE KUWAIT'S TRAWL FISHERY
"... The catch rate and sustainable yield of the Kuwait's trawl fishery was estimated from the Research Vessel sea survey data from 1979 to 1987. The mean monthly and annual catch rate for mixed fish, mixed shrimp and catfish varied among months and between years. The annual variations in the mean c ..."
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The catch rate and sustainable yield of the Kuwait's trawl fishery was estimated from the Research Vessel sea survey data from 1979 to 1987. The mean monthly and annual catch rate for mixed fish, mixed shrimp and catfish varied among months and between years. The annual variations in the mean
Geometry for the selfish herd.
- Journal of Theoretical Biology,
, 1971
"... This paper presents an antithesis to the view that gregarious behaviour is evolved through benefits to the population or species. Following Galton (1871) and Williams (1964) gregarious behaviour is considered as a form of cover-seeking in which each animal tries to reduce its chance of being caugh ..."
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Cited by 238 (0 self)
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of day-up to this time it sleeps on the bottom of the pond. Shortly before the snake is due to wake up all the frogs climb out onto the rim of the pond. This is because the snake prefers to catch frogs in the water. If it can't find any, however, it rears its head out of the water and surveys
Analysis of demersal species assemblages from trawl surveys
- in the South Adriatic Sea. Aquatic Living Resources
, 1999
"... Abstract — Two trawl surveys were carried out in the summer months (June-July) of 1996 and 1997 along the whole South Adriatic area (Mediterranean sea) for the first time, using the same vessel and the same sampling gear (European Community Research Project 'MEDITS'); previous research dat ..."
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Cited by 4 (0 self)
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Abstract — Two trawl surveys were carried out in the summer months (June-July) of 1996 and 1997 along the whole South Adriatic area (Mediterranean sea) for the first time, using the same vessel and the same sampling gear (European Community Research Project 'MEDITS'); previous research
Comparison of Elasmobranch Catches from Research Trawl Surveys and Commercial Landings at Port of Viareggio, Italy, in the Last Decade
"... A program to monitor commercial elasmobranchs was put into effect at Viareggio, the most important fishing port of the Tyrrhenian and Ligurian seas. Size structure of the catches and spatial information on fishing effort distribution were collected monthly by species and gear over the period 1990–20 ..."
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–2001. Data on catch rates and geographical distribution were also obtained from annual research trawl surveys during 1985–2001 in the same area that the fish landed at Viareggio were caught. The distribution of the fishing effort for every major fishery was compared with catch rates of research trawl surveys
Historical Variation on Total Catch and Discard CPUEs and bottom trawl survey abundances in the Northern Spanish Shelf: are they related?
"... Patterns of variation of total catch and discards of the Northern Atlantic Spanish shelf otter trawl fishery in the last two decades are analysed. These patterns are compared with the data series on species abundance indices obtained from scientific bottom otter trawl surveys. ..."
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Patterns of variation of total catch and discards of the Northern Atlantic Spanish shelf otter trawl fishery in the last two decades are analysed. These patterns are compared with the data series on species abundance indices obtained from scientific bottom otter trawl surveys.
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