By Tore Jakobsen, Michael J. Fogarty, Bernard A. Megrey, Erlend Moksness
“The monetary value of fishes and their societal and cultural relevance offer robust incentives for large-scale, sustained reviews in their dynamics” the EditorsThe total aim of this e-book is to provide an image of the current use of knowledge on fish reproductive biology in review and administration and its power for bettering administration of those resources. Compiled through a world workforce of authors, each one a professional of their box, this unparalleled quantity is split into 3 significant sections:· Biology, inhabitants dynamics, and recruitment· info severe to profitable review and management· Incorporation of reproductive biology and recruitment issues into administration suggestion and strategiesIncluding over a hundred diagrams, this booklet is vital examining for all fisheries scientists. Libraries in universities and examine institutions the place this topic is studied and taught must have copies on their shelves. “As one writer placed it: the target is to facilitate a ‘dialogue among review scientists and biologists.’ Readers of any distinctiveness may still settle for this problem, and this e-book is a wonderful source to assist them.” Fisheries, March 2010
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Additional info for Fish Reproductive Biology: Implications for Assessment and Management
The model for individuals having found shelter is: dN s = −Ms Ns + rN d (m − Ns ) dt (33) BLBK120/Jakobsen March 18, 2009 18:12 Recruitment in Marine Fish Populations 33 Although this system of equations does not appear to have an analytical solution, Walters & Martell show that the numerical solution indicates an asymptotic recruitment model. Interestingly the solution reveals a more abrupt transition to the asymptotic state than the Beverton–Holt model and is more similar to the results obtained with the so-called hockey-stick representation of Barrowman & Myers (2000) in which recruitment increases linearly from the origin until a threshold level of reproductive output is reached and recruitment remains constant thereafter (see Marshall et al.
10). If we ignore or are unaware of maternal effects, the consequences of fishing on the population will then depend on the interplay of these two factors—the potential underestimation of the slope of the recruitment curve at the origin and the overestimation of the lifetime reproductive output of viable eggs. 14 showing equilibrium points and the limiting level of fishing mortality beyond which the risk of stock collapse is high. 17(a), bold line) with a proper accounting of realized egg production levels.
9). Relatively small differences in the slope of the recruitment curve at the origin can have important implications for inferences concerning the resilience of a population to high levels of exploitation. Later in this chapter, we will explore how these considerations shape our view of the resilience of a population to harvesting and the ways in which a refined understanding of the reproductive output of a population can help in setting appropriate management objectives. 3 Completing the life cycle The previous sections dealt strictly with processes during the pre-recruit phase, operating on the initial number of viable eggs produced by the population.