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Molt and reproduction enhancement together with hemolymph ecdysteroid elevation under eyestalk ablation in the female fiddler crab,Uca triangularis(Brachyura:Decapoda) 被引量:3
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作者 SUPRIYA Nagathinkal T sudha kappalli +1 位作者 KRISHNAKUMAR Velayudhannair ANILKUMAR Gopinathan 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2017年第3期645-657,共13页
We present the results of eyestalk extirpation experiments performed on the fiddler crab, Uca triangularis at seasons of molting and reproduction, with a view to have a better understanding of the regulatory mechanism... We present the results of eyestalk extirpation experiments performed on the fiddler crab, Uca triangularis at seasons of molting and reproduction, with a view to have a better understanding of the regulatory mechanisms of these two highly energy-demanding processes. Bilateral eyestalk ablation resulted in precocious acceleration of both molting and reproduction, irrespective of the season at which each experiment was conducted. The rate of accelerated ovarian growth, however, was maximum if the eyestalk ablation was conducted during August–January, the breeding season in the wild, or in February–May(molting-reproductive season), wherein a section of the wild population would be engaged in molting and another section in breeding. The highest degree of precocious molt acceleration, on the other hand, was obtained during June–July when the population was primarily engaged in molting, but with no reproductive activity. The precocious oocyte maturation(due to de-eyestalking) was minimal in June–July. Significantly, the eyestalk ablation also resulted in a dramatic increase in the hemolymph ecdysteroid titer, revealing that a high ecdysteroid titer would have no restraining influence on vitellogenesis. No spawning was, however, observed among de-eyestalked females, even though their final oocyte size surpassed the size of the normal mature oocytes, implying that spawning is not exclusively under the control of eyestalk hormones. A comparative study performed on the vitelline components of the experimentals and the controls revealed that the precociously incorporated yolk under eyestalk ablation was biochemically impoverished. These results indicate that throughout the annual cycle, both the somatic and the reproductive growth of U. triangularis are under the influence of inhibitory principles from the eyestalks. It is also revealing that mere deprival of the inhibitory principles does not culminate into successful vitellogenesis. Arguably, the inhibitory influence from the eyestalks could be a prerequisite for normal healthy maturation of the oocytes and spawning. 展开更多
关键词 蜕皮激素 繁殖季节 眼柄 雌蟹 卵母细胞成熟 UCA 十足目 高程
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Clupeid fish hosts a Peniculus sp.(Pennellidae,Siphonostomatoida, Copepoda)—First report on new host and season dependent prevalence
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作者 Rijin Kattambally Mumthaz TMV +1 位作者 sudha kappalli Gopinathan Anilkumar 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2019年第12期118-125,共8页
Pennellid copepod Peniculus fistula fistula(Nordmann, 1832)(Synonym: Peniculus fistula Nordmann, 1832,Aphia ID: 745880), a worldwide distributed species, has been recovered from at least 19 teleost families. The prese... Pennellid copepod Peniculus fistula fistula(Nordmann, 1832)(Synonym: Peniculus fistula Nordmann, 1832,Aphia ID: 745880), a worldwide distributed species, has been recovered from at least 19 teleost families. The present paper reports for the first time from the Malabar coast(South India), not only the existence of a new host family, Clupeidae, hosting this parasitic copepod species(P. fistula fistula) but also their season dependent hosting. A total of 123 marine fish species, belonging to 77 genera and 38 families surveyed along the Malabar coast, only the clupeid, Anadontostoma chacunda(Hamilton, 1822) was shown to be infected by this copepod species;all the recovered(copepod) parasites were invariably found attached at the mid portion of the caudal fin lobes and lying parallel to the host body, indicating the strict site-specific parasitisation. There is a discrete seasonality in the prevalence(P<0.05) as the sign of infection was noticed during the period from September to May with relatively high prevalence during winter months(November–January). During the monsoon months(June–August), the host fish was found completely free from Peniculus infection. Interestingly, all the 229 recovered specimens(P. fistula fistula) were gravid females having paired uniserrate egg sacs with the length more than its own body length. 展开更多
关键词 clupeid fish Peniculus fistula fistula host specificity SEASONALITY PREVALENCE
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