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Ocean Studies Board, National Research Council

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IMPROVING THE Collection, Management, and Use of Marine Fisheries Data

NATIONAL ACADEMIES PRESS

Contents

EXECUTIVE SUMMARY............................................................................................................................................................................11 INTRODUCTION...............................................................................................................................................................................9Data Collection..............................................................................................................................................................................12Biological Data..............................................................................................................................................................................12Social and Economic Data.....................................................................................................................................................................13Data Management..............................................................................................................................................................................14Data Use.....................................................................................................................................................................................15Assessments..................................................................................................................................................................................15Regulations and Management...................................................................................................................................................................17Content of Report............................................................................................................................................................................192 SUMMER FLOUNDER: REVIEW AND INSIGHTS.......................................................................................................................................................20Introduction.................................................................................................................................................................................20Summer Flounder Assessment Issues............................................................................................................................................................21Questions Related to the Biology and Population Dynamics of Summer Flounder..................................................................................................................22Do the summer flounder found in waters north of Cape Hatteras comprise a unit stock of fish?.................................................................................................23What natural mortality rate is appropriate to use in summer flounder assessment models?......................................................................................................25Are there differences between the growth and mortality of male and female summer flounder (sexual dimorphism) and, if so, how do the differences affect the assessment?.....................29Questions Related to Summer Flounder Sampling................................................................................................................................................30What are the appropriate survey and commercial catchabilities of summer flounder?............................................................................................................30Do problems with determining the age of summer flounder discredit age-based assessments?.....................................................................................................38Are effort data used appropriately and are the effects of effort changes incorporated properly?..............................................................................................40Is the observer program for summer flounder adequate?........................................................................................................................................41Can and should state surveys be standardized?................................................................................................................................................43Is the catch from recreational fishing estimated properly?...................................................................................................................................44Can the precision of data be improved?.......................................................................................................................................................46Questions Related to the Information Content of the Model and Model Assumptions Currently in Use.............................................................................................51What information does each model structure require and how do these requirements relate to information in the data?..........................................................................51Possible Improvements to the Summer Flounder Data Sets.......................................................................................................................................54Tracking and Management of Data Precision....................................................................................................................................................57A Role for Commercial and Recreational Fishermen in Data Collection..........................................................................................................................57New Sources of Recreational Fishery Data.....................................................................................................................................................573 GENERAL ISSUES IN THE COLLECTION, MANAGEMENT, AND USE OF FISHERIES DATA....................................................................................................................59What Are Fisheries Data?.....................................................................................................................................................................59Who Uses Fisheries Data?.....................................................................................................................................................................60Data Needed for Different Management Methods.................................................................................................................................................62Current State of the Fishery.................................................................................................................................................................62Management Goals and System Response.........................................................................................................................................................64Management Actions...........................................................................................................................................................................64Data Quality Required........................................................................................................................................................................65Methods of Data...