نتایج جستجو برای: natural and fishing mortality

تعداد نتایج: 16915710  

Journal: :International maritime health 2015
Stephen E Roberts Tim Carter

BACKGROUND To establish the causes of mortality in the British fishing industry from 1900 up to 2010, to investigate long term trends in mortality and to identify causal factors in the mortality patterns and rates. MATERIALS AND METHODS A longitudinal study, based on examinations of official death inquiry files, marine accident investigation files and reports, death registers and annual death...

2017
Caitlin D. Kuempel Andrew H. Altieri

Natural and anthropogenic stressors can cause phase shifts from coral-dominated to algal-dominated states. In the Caribbean, over-fishing of large herbivorous fish and disease among the long-spined urchin, Diadema, have facilitated algal growth on degraded reefs. We found that diminutive species of urchin and parrotfish, which escaped die-offs and fishing pressure, can achieve abundances compar...

Journal: :Journal of environmental biology 2012
Amitabh Chandra Dwivedi Prakash Nautiyal

A study was conducted on the economically important fishes Labeo rohita (Hamilton 1822), Tortor (Hamilton 1822) and Labeo calbasu (Hamilton 1822) stocks from the Ken, the Paisuni and the Tons rivers in the Vindhyan region. Asymptotic length was maximum in L. rohita (946, 833 and 962 mm) as compared with T. tor (822, 787 and 946 mm) and minimum in L. calbasu (567, 612 and 692 mm) in the Ken, the...

Journal: :تحقیقات اقتصاد و توسعه کشاورزی ایران 0
شهلا چوبچیان دانشجوی دکتری توسعۀ کشاورزی دانشکدۀ اقتصاد و توسعۀ کشاورزی خلیل کلانتری استاد دانشکدۀ اقتصاد و توسعۀ کشاورزی علی اسدی استاد دانشکدۀ اقتصاد و توسعۀ کشاورزی سید امین الله تقوی مطلق استادیار وزارت جهاد کشاورزی غلامحسین حسینی نیا استادیار دانشکدۀ کارآفرینی دانشگاه تهران

fishing as one of the most important agricultural sectors has an important role in providing the protein for people. pareh cooperatives despite of having a long history, are faced with problems such as loss of fishing catch compare with previous years, the high cost of purchasing tools and equipments to catch and transportation and location of fishing become unfavorable due to natural and human...

Abolhasani, M.H., Amini Charmahini , M., Ghorbani, R., Haghi Vayeghan , A., Hashemi, A.R., Hedayati , A.,

Seasonal samplings were conducted over a year to study population dynamic of Carasobarbus luteus in Shadegan Wetland. Samples were collected from five sampling stations in Shadegan Wetland (Salmane, Rogabe, Khoroosi, Mahshahr and Atish) from April 2014 to March 2015. From total number of 1608 samples, 276 individuals were male and 1332 individuals were female. Length-weight relationship was W=0...

2011
Kari H. Fenske Michael J. Wilberg David H. Secor Mary C. Fabrizio

American eel (Anguilla rostrata) and European eel (Anguilla anguilla) populations have declined since the 1980s prompting concern about their status and the causes of decline, but stock assessment approaches to estimate effects of fishing on these populations are lacking. Since 1964, 16% of United States commercial American eel harvest came from the Potomac River, yet American eel abundance, pr...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه - دانشکده کشاورزی 1393

چکیده کنه تارتن دو لکه ای tetranychus urticae koch یکی از چندخوارترین آفات شناخته شده محصولات کشاورزی دنیا به حساب می آید. در این بررسی جمعیت تخم و مراحل فعال این کنه در شرایط آلودگی طبیعی و مصنوعی در برگ های 8 رقم لوبیا در سال 1392 در گلخانه و مزرعه تحقیقاتی دانشکده کشاورزی دانشگاه ارومیه موردمطالعه قرار گرفت. آزمایش به صورت طرح کاملاً تصادفی برای شرایط مزرعه در10 تکرار و برای شرایط گلخانه ای...

A Arshad, R Ara S.M.N Amin T Sofea Z Zamri

This study estimated the length-weight relationship, sex ratio and population parameters of mantis shrimp, Harpiosquilla harpax from the coastal waters of Pantai Remis, Perak, Malaysia between February 2012 and October 2012. Total length and weight of 804 specimens of H. harpax were measured and the sex ratio was 1: 0.83 (M: F). Males of H. harpax were dominant over the females throughout the s...

R Ara, T Sofea, A Arshad , S.M.N Amin , Z Zamri ,

This study estimated the length-weight relationship, sex ratio and population parameters of mantis shrimp, Harpiosquilla harpax from the coastal waters of Pantai Remis, Perak, Malaysia between February 2012 and October 2012. Total length and weight of 804 specimens of H. harpax were measured and the sex ratio was 1: 0.83 (M: F). Males of H. harpax were dominant over the females throughout the s...

Kamrani, E., Kaymaram, F., Mahdavi Najafabadi , R., Salarpouri, A.,

The population parameters of Encrasicholina punctifer (buccaneer anchovy) from commercial fisheries in the Persian Gulf and Oman Sea coastal waters were studied from October 2014 to September 2015. A total of 13951 length-frequency data were collected monthly by pair-boat purse seine and beach seine methods. The asymptotic length (L∞) and Von Bertalanffy growth function (K) were 11.5 cm and K=1...

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