Bottom Trawl Surveys - Proceedings of a Workshop Held at Ottawa ...

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4 Research vessel operating expenditures, justified primarily by needs for abundance surveys, exceed $10,000,000 annually and thus represent a substantial percentage of our fisheries research expenditures. Large numbers of person-years are devoted to vessel crews and survey-related scientific staff. In view of the magnitude of research vessel expenditures, it is crucially important that research vessel surveys be efficiently designed and that the maximum of information is extracted from data collected. Efficiency of the data collection program must be balanced with accurate appraisal of the impact of survey data on fishery management advice and regulatory measures; this is critical as we plan research vessel acquisition and deployment for the 1980's. I note that .the Workshop agenda addresses a wide range of topics relevant to planning needs. Sessions range from sampling techniques, to estimation, to impact of surveys on management advice. There are many contributed papers which I am sure will stimulate constructive debate and conclusions which will aid us all in program planning. I wish you a very successful Workshop. Les depenses de fonctionnement des navires de recherche, justifiees essentiellement par la necessite des releves d'abondance, depassent $10,000,000 par annee, ce qui represente un pourcentage appreciable de nos depenses de recherche sur les peches. De nombreuses annees-personnes sont consacrees aux equipages des navires et au personnel scientifique attache aux releves. Etant donne 1 'ampleur des depenses liees aux navires de recherche, i 1 est tres important que 1 es releves soient bien prepares et que 1 'on tire des donnees recueillies le maximum de renseignements. L'efficacite du programme de collecte des donnees doit etre renforcee par une evaluation precise de l'incidence des donnees fournies par les releves sur les conseils en matiere de gestion des peches et sur les mesures de reglementation; cela est crucial pour la planification de 1 'acquisition et du deploiement des navires de recherche pour les annees quatre-vingt. Je remarque qu'une grande variete de sujets inscrits a 1 'ordre du jour de 1 'atelier sont lies aux besoins d'une telle planification. Les sujets a 1 'etude vont des techniques d'echantillonnage a 1 'evaluation, puis a l'incidence des releves sur les conseils de gestion. Je suis convaincu que de nombreux documents ameneront des discussions et des propositions constructives qui nous aideront a planifier le programme. Mes meilleurs voeux de succes a tous.
Workshop Report Rapport de l'atelier
Page 2 and 3: Canadian Special Publication of Fis
Page 5 and 6: iv TABLE OF CONTENTS/TABLE DES MATI
Page 7 and 8: Abstract Doubleday; W.G., and D. Ri
Page 24 and 25: 6) That sensitivity analyses relati
Page 26: List of Participants/Liste des Part
Page 49: Division 30 Division 3N Table l. co
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45"00 Yi Fig. 12. Contour diagram o
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66 When departing on a survey, each
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68 ABUNDANCE ESTIMATES OF THE TRAWL
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-:... "' "' 3 _..-bob in 0 35cm Fig
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74 wires length (m) 1250 1000 7 50
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78 200 150 100 50 • • • •
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CATCH PROJECTIONS AND THEIR RELATIO
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AGE 3 4 5 6 7 8 9 10 11 12 13 14 15
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TABLE B. Relative error (expressed
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contribute significantly to the est
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114 It is seldom the case that surv
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124 GROUNDFISH SURVEY TECHNIQUES AS
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126 The area bounded by the 100-fat
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132 Table 2. Biomass estimates, Esq
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136 Table 6. Esquiman Channel, Gulf
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140 Table 10. Shrimp biomass estima
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146 Dupouy, H., J. Frechette and C.
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ABUNDANCE ESTIMATORS BASED ON STRAT
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to be exact. Monte Carlo simulation
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EXAHPLE 2 Haddock in NAFO Division
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178 ANALYSIS OF VARIANCE SOURCE CON
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SUMMER DISTRIBUTION OF GROUNDFISHES
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194 DISTRIBUTION AND SAMPLING VARIA
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Fig. 4 ' cont'd 205
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66' 62' 46' COD 1976 62' 1978 60' 6
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46" u• 46" 66" 64" 62" 64" 62" oo
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216 arhythmic in spring-early summe
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226 Tableau 5 - Pourcentage cumulat
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230 Much further work on fish swimm
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Table 3b. Variation of s (feet/sec
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250 FISH BEHAVIOUR IS A MAJOR FACTO
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professional fisherman. No matter h
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270 10 8 6 4 2 8 6 4 2 10 8 6 4 2 1
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