نتایج جستجو برای: growth and mortality parameters

تعداد نتایج: 16999650  

Journal: :iranian journal of veterinary science and technology 0
mojtaba alishahi esmail abdy

this study was conducted to determine the effects of administration of different concentration of aloe vera crud extract (ace) as a food supplement on growth performance, immune response and disease resistance against aeromonas hydrophila (chester) infection in cyprinus carpio. 360 juvenile c.carpio were randomly divided into four equal groups in triplicates. groups 1 to 4 were fed by basal foo...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده برق و الکترونیک 1390

there are many approaches for solving variety combinatorial optimization problems (np-compelete) that devided to exact solutions and approximate solutions. exact methods can only be used for very small size instances due to their expontional search space. for real-world problems, we have to employ approximate methods such as evolutionary algorithms (eas) that find a near-optimal solution in a r...

Journal: :international journal of aquatic biology 0
hamid reza esmaeili department of biology, college of sciences, shiraz university, shiraz, iran. mohadeseh sadat tahami shiraz university mohsen safaie hormuzgan university

the present study provides the data on the population parameters of an endemic qanat spirlin, alburnoides qanati from the endorheic kor river basin of iran to assess the stock status of this cyprinid fish species, which is highly important from management and conservation points of views. fish specimens (387) were collected from moshkan stream, kor river basin, iran in 2011-2012. asymptotic len...

پایان نامه :دانشگاه بین المللی امام خمینی (ره) - قزوین - دانشکده مهندسی معماری و شهرسازی 1388

nowadays,tourism industry considered as one of the main sources of income of a country.unfortunately and despite of owning plenty of cultural historical and natural attractions, iran has not reached to a proper position in this field. besides, the historical cities of a country are considered as the income resource and national wealth of it. qazvin with a rich cultural precedent, have suitable ...

Journal: :زیست شناسی جانوری تجربی 0
محمود نفیسی بهابادی دانشیار گروه شیلات دانشکده کشاورزی و منابع طبیعی دانشگاه خلیج فارس، بوشهر وحید مرشدی پژوهشکده خلیج فارس، دانشگاه خلیج فارس، بوشهر

abstarct at the present study effects of salinity were studied on growth and feeding performance, survival rate and blood biochemical parameters of pre on-growing rainbow trout (oncorhynchus mykiss) with initial weight 93.22±4.11 g for 60 days. after adaptation for 10 days to water salinity, 450 fish were distributed in 5 treatments and 3 replicates according to completely randomized design. be...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - دانشکده علوم 1391

abstract in the present research solution of chalcopyrite in sulfuric acid in hydrometallurgy method using electrochemistry with cyclic voltammetry technique has been investigated. the value of maximum reduction peak current of copper ions represents the measure of solubility. in this research different parameters temperature, potential, potential exert time, chalcopyrite concentration, sulfur...

2007
David Griffiths Chris Harrod

Pauly (1980. J. Cons. Int. Explor. Mer, 39: 175–192) showed that natural mortality rates in fish could be predicted from body growth parameters and environmental temperature but found no evidence for ecological or taxonomic influences. Using an updated database and techniques that avoid some of the earlier analytical problems, we confirm Pauly’s conclusion that mortality is correlated with grow...

Journal: :iranian journal of ichthyology 0
erdogan cicek nevsehir haci bektas veli university, faculty of art and sciences, department of biology, 50300, nevsehir, turkey.

the objectives of this study were to determine the age, growth, mortality and exploitation of a commercially important fish of northeastern mediterranean sea, mullus barbatus from the karatas coast of iskenderun bay during september 2002 and april 2003. a total of 212 specimens of red mullet were collected by monthly sampling using traditional bottom trawl net by commercial vessel (coskun reis,...

ژورنال: بوم شناسی آبزیان 2014
Alaei, Ahmad , Mazaheri, Zohre , Paighambari, Seyed Yousef , Salarpouri, Ali ,

Sind sardine Sardinella sindensis (Day, 1878) is the most important ecological and commercial surface resources in Persian Gulf and Oman sea. This study was carried to study some population dynamics parameters of Sind sardine in Coastal waters of Jask Province during January 2011 to December 2012. A totall 2887 specimens were collected from commercial fishing Purse seiners, monthly. Biometric p...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه محقق اردبیلی - دانشکده علوم کشاورزی 1391

abstract: the potato tuberworm, phthorimaea operculella (zeller), is an important insect pest of potato (solanum tuberosum l.) in the storage and field in most parts of the world especially in tropical and subtropical regions due to its close relationship with the host, high reproductive potential and high economic losses. information on host preference, life table parameters and digestive en...

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