نتایج جستجو برای: growth and fishing indices

تعداد نتایج: 16941550  

Journal: :caspian journal of environmental sciences 2011
s. bakhshalizadeh a. bani s. abdolmalaki r. nahrevar r. rastin

the age and growth of the persian sturgeon, acipenser persicus, obtained from the iranian coastal waters of the caspian sea, were studied through analysis of the pectoral fin ray section from 180 specimens, ranging in fork length (fl) from 66 to 203 cm. the specimens were obtained from commercial fisheries between october 2008 and june 2010. interpretation of growth bands in the pectoral fin ra...

Journal: :نشریه تحقیق در علوم کشاورزی 0

somayyeh bayat and ali sepehri * department of agronomy and plant breeding, faculty of agricultre, bu-ali sina university of hamedan, iran       *corresponding author: e-mail. [email protected], [email protected]   received: 31 may 2012  accepted: 8 october 2012   abstract growth and yield of maize is seriously restricted by water deficit. salicylic acid (sa) and paclobutrazol )pbz) indu...

Journal: :journal of agricultural science and technology 2011
t. enayat gholampoor m. r. imanpoor b. shabanpoor s. a. hosseini

this study was carried out to investigate the effects of salinity levels (0, 2, 4, 7 and 10 ppt) on growth indices, blood biochemical parameters, and body composition in rutilus frisii kutum fingerlings (initial weight 1.330.02 g) during 60 days. results indicated that the highest rates of daily growth, specific growth and weight gain per fish were obtained at the levels of 4 and 2 ppt (p0.05)...

Kiarostami, Khadijeh, Mirzaei, Tahereh,

Lemon balm (Melissa officinalis) is a medicinal plant belonging to lamiaceae and is rich in antioxidant compounds. with the aim of optimizing the production of antioxidant compounds, in this research, we studied the effect of different concentrations of silver nanoparticles on growth indices and antioxidant activity of proliferated shoots in vitro culture. For this purpose, seedlings of seed ge...

Journal: :Ambio 2002
Randall A Kramer Sahat M H Simanjuntak Christopher Liese

The coastal ecosystems in Southeast Asia are under increased pressure from local and global change. This paper examines human migration and the use of marine resources in coastal villages in the Minahasa district of North Sulawesi, Indonesia. Primary data were collected through interviews with village leaders, focus groups, and a sample survey of 600 fishing households. Migration is responsible...

2007
Richard Law

This essay comments on recent research on Darwinian fisheries science and on the future development of this field. From a practical point of view, the key question is: how fast are evolutionary changes caused by fishing happening? To answer this question, there is a need to understand intensities of selection generated by fishing, heritabilities and genetic correlations of the traits under sele...

2009
Patrick Lehodey Inna Senina P. Lehodey I. Senina

SEAPODYM is a model developed initially for investigating spatial tuna population dynamics under the influence of both fishing and environmental effects. The model is based on advection-diffusion-reaction equations. The main features of this model are i) forcing by environmental data (either observed or modeled), ii) prediction of both temporal and spatial distribution of age-structured populat...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1392

gol-e-gohar iron ore mine of sirjan in southern part of iran is a large open pit that operates below the groundwater table and during mining operation, dewatering is required to prevent operation processes from flooding. current operation is going on by digging wells in or out of the pit and pumping to prevent flooding. as a result of the former dewatering operation a vast deep cone of depressi...

A Arshad K. C. A Jalal M. A Rahman M. K Mohd Azim S. M. N Amin, S. N. J Fatinah

An investigation of the population parameters of Indian mackerel, Rastrelliger kanagurta (Cuvier, 1816) in the Marudu Bay, Sabah, Malaysia was carried out from January to September 2013. The relationship between total length and body weight was estimated as W=0.006TL3.215 or Log W=3.215LogTL – 2.22 (R2=0.946). Monthly length frequency data of R. kanagurta were analyzed by FiSAT software to eva...

A. Vahabnezhad M. Ghodrati Shojaei M. Hakimelahi, S. A. Taghavi Motlagh, S. J. Seyfabadi

  The population parameters and spawning season of the Spangeld emperor (Lethrinus nebulosus) were studied in coastal waters of Hormouzgan province. The monthly calculated mean values of gonadosomatic index (GSI) of females were indicate to increase from February, reach the highest in March and decline in June. The spawning season peak of L. nebulosus occurred in March. The Von Bertalanffy grow...

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