Use of otoliths to estimate size at sexual maturity in fish
نویسندگان
چکیده
منابع مشابه
Determining Sexual Maturity of Broodstock for Induced Spawning of Fish
The external appearance of brood fish has long been used to assess the stage of sexual development. In some species, males change in appearance during the spawning season (e.g., vivid breeding colors in cichlids, hooked jaw in salmon, and roughened texture of the pectoral fins or head of cyprinids). These physical changes make it relatively easy to identify sexually mature males. However, secon...
متن کاملInheritance of Age at Sexual Maturity
Dr. RAYMOND PEARL (1912) was the first worker to suggest that sexlinked factors were involved in the inheritance of fecundity. PEARL used as a measure of fecundity the eggs produced during the winter period. He proposed that two major dominant factors were responsible for high egg production, one of which resided in the sex chromosome. GOODALE (1919) and HURST (1921) each failed to confirm the ...
متن کاملEstimation of size at sexual maturity: an evaluation of analytical and resampling procedures
Size at 50% maturity (l50%) is commonly evaluated for wild populations as a point of biological reference (see Table 1). To estimate l50%, a sample of organisms known to have just reached sexual maturity could be available and their arithmetic mean size can be used as an estimator. However, the sample needed to obtain such a designbased estimator (Smith, 1990) for wild populations might be too ...
متن کاملallometric growth pattern, sexual dimorphism and size at the onset of sexual maturity in opusia indica (brachyura: ocypodoidea: camptandriidae) from mangrove areas of pakistan
size at sexual maturity and patterns of somatic growth are important aspects of reproductive history of crab. the main purpose of this study is to provide an estimate for the onset of morphological sexual maturity in mangrove crab, opusia indica from a population located in korangi creek intertidal mud flat (karachi, pakistan) based on relative growth. the crabs were monthly collected through q...
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این تحقیق به منظور بررسی رابطه بین میزان استراتژیهای خود-تنظیم شده یادگیری و تمایل به ایجاد ارتباط دانشجویان زبان انگلیسی انجام شده است.علاوه بر این،روابط و کنش های موجود بین ریزسنجه های استراتژیهای خود-تنظیم شده یادگُیری ، مهارت نگارش و تمایل به برقراری ارتباط و همچنین تاٍثیرجنسیت دانشجویان زبان انگلیسی در استراتژیهای خود-تنظیم شده یادگیری و تمایل به برقراری ارتباط آنها مورد بررسی قرار گرفته شد.
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ژورنال
عنوان ژورنال: Brazilian Archives of Biology and Technology
سال: 2000
ISSN: 1516-8913
DOI: 10.1590/s1516-89132000000400014