نتایج جستجو برای: growth and fishing indices

تعداد نتایج: 16941550  

Journal: :international journal of advanced biological and biomedical research 2014
syed ehsan hosseini gholamreza din panah

the aim of this study was to determine influencing factors on participation of fishermen member cooperative in sustainable fishing in golestan province. the methodological approach of this study was descriptive- correlative. the research population consisted of 144 fishermen who member cooperative, which were selected using census method. validity of the instrument was established by a panel of...

2013
Maciej T. Tomczak Johanna J. Heymans Johanna Yletyinen Susa Niiranen Saskia A. Otto Thorsten Blenckner

Several marine ecosystems under anthropogenic pressure have experienced shifts from one ecological state to another. In the central Baltic Sea, the regime shift of the 1980s has been associated with food-web reorganization and redirection of energy flow pathways. These long-term dynamics from 1974 to 2006 have been simulated here using a food-web model forced by climate and fishing. Ecological ...

This study was conducted to evaluate the performance of Gilan trawling cooperatives. In this research, the descriptive statistics and break-even analysis method was used and the data of this research were collected by using a questionnaire from trawling cooperatives for the fishing season of 1396. The results showed that the cooperatives of Rasht and Astara with the average of 111829 and 7710 k...

F. Şen, Ö. Kara,

This study was carried out to determine population structure, growth and reproduction properties of barbel. A total of 198 individuals were sampled. Ages of samples were found between I and VI years, fork lengths between 4.3 and 16.6 cm and total weights between 1.2 and 65.8 g. Length-weight relationship was calculated as W=0.0146×L2.934. Munro’s phi prime index was estimated as 1.9...

Journal: :Occupational and environmental medicine 2004
M F Jeebhay T G Robins A L Lopata

T he fishing and fish processing industry has experienced tremendous growth in recent years. In 1990 the Food and Agriculture Organisation (FAO) estimated that the number of people engaged in fishing, aquaculture, and related activities worldwide doubled to 28.5 million from 1970. Among these workers 52% worked aboard fishing trawlers, 32% were involved in aquaculture production (marine and fre...

The bony fishes of the Caspian Sea are the species whose reserves are decreasing due to Pollution, habitat destruction, exploitation and illegal fishing. Regarding the extent of illegal fishing in Golestan province and lack of sufficient studies in this regard, this study examines the changes in illegal fishing and identifies the factors involved in its occurrence. Using descriptive-analytical ...

Journal: :SIAM J. Control and Optimization 2009
Alberto Bressan Wen Shen

Abstract. In this paper we study a model for the harvesting of marine resources, described by an elliptic equation. Since the cost functionals have sublinear growth w.r.t. the pointwise intensity of fishing effort, optimal solutions are in general measure-valued. For the control problem, we prove the existence of optimal strategies. Uniqueness is established within a class of measures with smal...

Journal: :علوم باغبانی ایران 0
سارا خراسانی نژاد عبدالکریم کاشی سید محمد فخر طباطبایی

some crops have been observed to posses effects of allelopathic type. it would be interesting and useful as well to study these plants' allelopathic effects on other crop plants, particularly in rotation and intercropping. so, in this study, the allelopathic potential of cucumber organs' extract on seedling growth of cucumber, eggplant, pepper, and tomato was evaluated using a randomi...

Journal: :چغندرقند 0
محمدرضا میرزایی مربی پژوهش، مرکز تحقیقات کشاورزی و منابع طبیعی همدان محمد عبداللهیان نوقابی دانشیار پژوهش، مؤسسه تحقیقات چغندرقند

the current study was carried out to examine sugar beet growth pattern in climatic conditions of hamedan, iran and to recognize the factors affecting its quantity and quality as well as the physiological indices. two sowing date experiments were conducted on the basis of a randomized complete block design with four replications and 11 harvests. the plots were destructively sampled and the growt...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید