The annual growth and reproductive cycle in four ascidians
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چکیده
منابع مشابه
Gonadal changes and serum steriod levels during the annual reproductive cycle of the pearl oyster Pinctada fucata gould
The annual reproductive cycle of peal oyster Pinctada fucata was characteised by documenting gonadal development and changes in serum levels of estradiol-17b (E2), testosterone (T) and progesterone (P) in the wild bivalve caught in natural beds in the Persian Gulf throughout the year. Bivalve populations employed in this study spawn in June-July and November-December. The pearl oysters had grou...
متن کاملGonadal changes and serum steriod levels during the annual reproductive cycle of the pearl oyster Pinctada fucata gould
The annual reproductive cycle of peal oyster Pinctada fucata was characteised by documenting gonadal development and changes in serum levels of estradiol-17b (E2), testosterone (T) and progesterone (P) in the wild bivalve caught in natural beds in the Persian Gulf throughout the year. Bivalve populations employed in this study spawn in June-July and November-December. The pearl oysters had grou...
متن کاملThe annual reproductive cycle of mink (Mustela vison).
Reproductive organ development, plasma sex steroid concentrations and fur growth patterns were determined for pubescent and adult mink of both sexes, at 1tc~ 8-week intervals, between July and the following June. Plasma estradiol concentrations and weights (mg/kg) of ovaries, oviducts and uteri decreased slightly in both pubescent and adult females during the first half of anestrus (July to Oct...
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The annual reproductive cycles of the Japanese sipunculans Siphonosoma cumanense (Keferstein) and Phascolosoma scolops (Selenka, de Man & Biilow) were studied based on size, density, and frequency distribution of gametes from May 1989 to November 1990 and October 1989 to February 1991, respectively. Aliquots from the total volume of the diluted coelomic fluid from each individual were analyzed....
متن کاملAnnual Reproductive Cycle of Acheilognathus majusculus, a Korean Endemic Species
An experiment was conducted to investigate the annual reproductive cycle of a Korean endemic species, Acheilognathus majusculus, from Jeokseong-myeon located in Seomjin River. The reproductive cycle is examined histologically regarding water temperature and day length of the habitat, the gonadosomatic index (GSI), the female ovipositor length index (OLI), monthly variation in egg diameter distr...
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ژورنال
عنوان ژورنال: Journal of the Marine Biological Association of the United Kingdom
سال: 1952
ISSN: 0025-3154,1469-7769
DOI: 10.1017/s0025315400003672