00-Introduction

00-Introduction - FW 431/531 - Dynamics of Marine...

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FW 431/531 - Dynamics of Marine Biological Resources One important job of fishery managers is to decide how fish stocks should be harvested. For example, when the harvests should occur and how many fish should be taken. In this course we will study some of the models that have been developed to help managers understand the likely consequences of their decisions. We will use algebra and basic calculs operations to derive some of the fundamental equations used in fisheries science to model processes such as survival, growth, reproduction, and fish capture. Course Objectives To explore in detail some of the models used for describing the dynamic behavior of exploited populations of fish and other marine biological resources. To provide an understanding of the assumptions and mathematics that underlie the models used in fisheries management. Overview of the Course 1) Some basic concepts and models in fisheries. a. Mortality and growth. b. Age distributions and catch curves. c. The catch process. 2) Yield-per-recruit analysis. 3) Stock and recruitment models. 4) Surplus production (biomass dynamics) models. 5) Bioeconomic models. 6) Multi-species models. In this course we will focus on the theoretical models and not on their applications to real data. We will not have time to review the numerous methods for "stock assessment" that have been developed. In particular, we will not examine the various methods for analyzing catch-at-age data or mark-and-recapture data. Applying the models to real data clearly is important, for otherwise there would be little point in developing the models. However, it is a sufficiently complex task that it is needs to be treated in its own course. Reading Materials There are some excellent books available that cover various topics in population dynamics and fisheries (e.g., Hilborn and Walters, 1992; Quinn and Deriso, 1999); Haddon, 2001). These are good reference books but, in my opinion, are not fully suitable as textbooks in that they often do not provide many details about the fundamental equations used in fisheries science. Most of the relevant background materials concerning models of fish population dynamics and fishery
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00-Introduction - FW 431/531 - Dynamics of Marine...

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