Download Fish Reproductive Biology: Implications for Assessment and by Tore Jakobsen, Michael J. Fogarty, Bernard A. Megrey, Erlend PDF

By Tore Jakobsen, Michael J. Fogarty, Bernard A. Megrey, Erlend Moksness

  “The monetary significance of fishes and their societal and cultural relevance offer strong incentives for large-scale, sustained reports in their dynamics” the EditorsThe total aim of this publication is to offer an image of the current use of data on fish reproductive biology in evaluation and administration and its power for making improvements to administration of those resources. Compiled by means of a global staff of authors, every one knowledgeable of their box, this unprecedented quantity is split into 3 significant sections:·         Biology, inhabitants dynamics, and recruitment·         info serious to profitable evaluation and management·         Incorporation of reproductive biology and recruitment concerns into administration recommendation and strategiesIncluding over a hundred diagrams, this booklet is key analyzing for all fisheries scientists. Libraries in universities and learn institutions the place this topic is studied and taught must have copies on their shelves. “As one writer placed it: the objective is to facilitate a ‘dialogue among overview scientists and biologists.’ Readers of any strong point should still settle for this problem, and this ebook is a superb source to help them.”   Fisheries, March 2010 

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Additional resources for Fish Reproductive Biology: Implications for Assessment and Management

Example text

We have framed our analysis of recruitment dynamics in terms of total viable egg production by the population and factors affecting growth and survival during the pre-recruit period. Because estimates of total egg production were not widely available at the time, the earliest recruitment models were recast in terms of spawning stock biomass. Ricker (1954) and Beverton & Holt (1957) assumed a simple proportional relationship between egg production and adult biomass and used the latter as a proxy for the former (Chapter 11).

The transitions between stages represent the probability of surviving and growing into the next stage during a specified time interval. Note that the population becomes vulnerable to exploitation following the first juvenile stage in this example. In the following, we use the size or age at first harvest as the demarcation point for recruitment. The life cycle is completed with the production of eggs by the adult component of the population. The fishery reduces the probability of survival in the late juvenile and the adult stages with important consequences for the overall reproductive output of the population.

2. For the population to persist, a sufficient number of progeny must, on average, survive to replace the parental stock. For the purposes of illustration, we show several stanzas including egg, larval, juvenile and adult stages. The eggs produced by the different adult stages can in principle exhibit different viabilities and have different probabilities of successful transition to the larval stage. For the purposes of this simple illustration we do not trace the effect of the size or age of the adult females beyond the egg stage but we can readily extend this treatment to later stages as well.

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