Understanding the status of fish stocks is a critical step in ensuring ecological and economic sustainability marine ecosystems. However, at least half global catch vast majority fisheries lack formal stock assessments, largely due to sufficient data. Catch data, loosely referring any records be it inclusive discards or not, are only type fishery data available across wide range scale. This has...

The purpose of resent research is to analysis and compares performance evaluation models of selected investment companies in Tehran Stock Exchange Market in the field of their portfolio management. The duration of research was between years 2009-2014. Statistical society the research is consisting of all active investment companies in in Tehran Stock Exchange Market which were 30 companies. Vol...

In the recent years, intangible assets and corporate brand have found a significant importance for corporates. These assets are accounted as essential for value making and even stabilizing the continuation of corporate trend. The purpose of the present study is to investigate the effect of profitability and operating cash flow on trademarks value in accepted corporate in Tehran stock exchange. ...

Objective: In general, financial time series such as stock indexes have nonlinear, mutable and noisy behavior. Structural and statistical models and machine learning-based models are often unable to accurately predict series with such a behavior. Accordingly, the aim of the present study is to present a new hybrid model using the advantages of the GMDH method and Non-dominated Sorting Genetic A...

Fisheries managers are likely to assess fish populations at some point during the fisheries management process. Managers that follow the fisheries management process (see Chapter 5) might find their knowledge base insufficient during the steps of problem identification or management action and must assess a population before appropriate actions can be taken. Managers will implement some type of...

Quantifying scientific uncertainty in estimating an appropriate catch level for a fish stock is challenging. Multiple sources of error can easily be identified, including measurement error that is conditioned on the adopted model, model specification error, forecast error, and uncertainty about overall stock productivity. In addition, there are without doubt other unknown factors that will nega...

Results from the approximate reweighting method used by the Scientiic Committee for its 1994 assessment of the Bering-Chukchi-Beaufort Seas stock of bowhead whales are connrmed using the full Bayesian synthesis approach. Sensitivity trials are examined to investigate several areas of interest identiied during this assessment. The results show that the full analysis gives results which are very ...

BACKGROUND Reducing carbon Emissions from Deforestation and Degradation (REDD+) is of central importance to combat climate change. Foremost among the challenges is quantifying nation's carbon emissions from deforestation and degradation, which requires information on forest carbon storage. Here we estimated carbon storage in India's forest biomass for the years 2003, 2005 and 2007 and the net f...

Following intense overfishing in the 1970s, the western stock of Atlantic bluefin tuna (Thunnus thynnus) experienced a long period of depressed abundance, which has been attributed to failure of the population to periodically produce large numbers of juveniles, the western stock mixing with the more highly exploited eastern stock (fisheries in the Northeast Atlantic Ocean and Mediterranean Sea)...

—Analyses of the population dynamics of blue crab Callinectes sapidus have been complicated by a lack of estimates of the instantaneous natural mortality rate (M). We developed the first direct estimates of M for this species by solving Baranov’s catch equation for M given estimates of annual survival rate and exploitation rate. Annual survival rates were estimated from a tagging study on adult...