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Advances in Marine Biology used to be first released in 1963. Now edited by way of A.J. Southward (Marine organic organization, UK), P.A. Tyler (Southampton Oceanography organization, UK), C.M. younger (Harbor department Oceanographic establishment, united states) and L.A. Fuiman (University of Texas, USA), the serial publishes in-depth and updated studies on quite a lot of issues that allows you to entice postgraduates and researchers in marine biology, fisheries technological know-how, ecology, zoology, oceanography. Eclectic volumes within the sequence are supplemented by way of thematic volumes on such issues as The Biology of Calanoid Copepods . * Rated "Number 1" within the hugely aggressive class of Marine & Freshwater Biology through ISI within the 2000 ISI journals quotation file * continues an influence issue of 3.37, the top within the box * sequence beneficial properties over 35 years of insurance of the learn
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Extra info for Endogenous and Exogenous Control of Gametogenesis and Spawning in Echinoderms
1982b). 3. , 1976; Smith, 1981). Smiley et al. (1991) considered it unlikely that nutrients derived entirely from ongoing feeding activity could support vitellogenesis in holothuroids. , 1991). , 1991; Walker, 1982a). , 1994; Smiley and Cloney, 1985). Histochemical observations have revealed seasonal reproductive and nutritional cycles in the tropical species Holothuria scabra (Krishnan, 1968). Autosynthesis of protein occurred in the ovaries, whereas the testes seemed to obtain protein from the gut.
Furthermore, oogenesis in P. ochraceus was initiated 6 months earlier, in mid-winter, following laboratory exposure to long day lengths (>12 h) (Fig. 2). However, the out-of-phase oogenic cycle was not sustained for more than a few months in specimens exposed to long day lengths, indicating that short day lengths may be required as well to maintain later phases of oogenesis. , 1986a). Pearse and Beauchamp (1986) found that individuals of Leptasterias sp. maintained for almost 3 years under two different photoperiod regimes under controlled laboratory settings shifted out-of-phase with respect to in-phase animals.
1998) were also able to maintain mature P. lividus throughout the year at 18–20 C, but in total darkness. More recently, Shpigel et al. (2004) presented evidence that temperatures of 18–22 C enhanced gonad growth in P. lividus from the Red Sea but that gametogenesis was controlled by photoperiod; long days reduced gametogenic rate while short days increased it. On the other hand, Spirlet et al. (2000) found temperature to be the main determinant of gonad development in P. lividus reared in the laboratory from broodstock collected in Brittany (France).