Mud crabs, as in other crustaceans have a unique mating mechanism in which males will transfer a quantity of sperms, called Spermathecal Load (SL), into the females as they mate (Signals from the eggs will modulate the sperm physiology, inducing the sperm to undergo a series of ordered changes in configuration that enables it to complete fertilization, which known as Acrosome Reaction (AR). back of the crab has a studs looking forming a U shape. iv Abstract There are four species of mud crab, Scylla serrata, S. tranquebarica, S. paramamosain and S. olivacea that are the focus of both commercial fisheries and aquaculture production throughout their distribution.
Scylla olivacea. j���ڨ*9�u�����]��nt��s4�����ۦ�Y��A��e�\Nu�2Ӊ�U}��d(�������+]1�U/B�Ĩb?cf�9lt����Ν$��}8��=����2P�콚�������t���?����/y?B�Ə�dw�d�`�97n���bi�-��Z3��|�� 0000005226 00000 n
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The crab samples were transferred back to 422 0 obj
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Although, some appears to be in Stage 2 and Stage 3 which might due to the result of ionic reaction (Following that, high percentages of sperms from wild-mated females were in Stage 4 and captive-mated females were mostly in Stage 2. 387 36
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By determining this relationship, the use of ... olivaea was identified based on the description by Keenan et al. 0000005112 00000 n
Most crab farmers targeting the seed from the wild for stocking in the ponds since the seed production of mud crab in captivity is unavailable for commercialization and still at the laboratory stage. xref
The size of the males and the mated females of Scylla olivacea (A), S. tranquebarica (B), and Scylla paramamosain (C). startxref
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(1998). Further, minor phenotypic variations in the present S. olivacea specimens could be attributed to geographical isolation from existing populations. 0000009340 00000 n
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However, mud crab populations are threatened by over exploitation and habitat degradation, and would benefit from resource management interventions. 0000005000 00000 n
trailer
The orange mud crab, Scylla olivacea, is regarded as an important fishery resource due to high demand and high market value. Add BLAST: 12: Calcium binding i: 72 – 83: PROSITE-ProRule annotation.
However, this variable was not possible to be avoided since a medium is needed to obtain sperm suspension. 0000004731 00000 n
Colour varies from red through brown to brownish/black depending on habitat. Description Actions Graphical view Length Calcium binding i: 40 – 51: PROSITE-ProRule annotation. Sequence and phylogenetic analysis placed the elovl close to the vertebrate Elovl1 and Elovl7 clade, which is distinct from the other remaining five Elovl families. %%EOF
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The AR can be defined as a process that releases the content of acrosomal vesicle to the exterior surrounding (Many researchers have been devoted to reveal that sperms of invertebrates need to undergo AR before penetrating the eggs for fertilization success (AR of sperm has been discussed by many researchers (Ringer solution used during preparation might affect the activation of the acrosome reaction. 0000007001 00000 n
They are among the most valuable crab species in the world, with the bulk of their commercial production sent live to market. [Keywords: New record, Scylla, morphometry, Goa, India] Introduction Mud crabs of the genus Scylla de Haan, … However, females which have mated more than 2 weeks in captivity could not be attained in the present study to confirm the assumption.As conclusion, AR of sperms was activated once they were ejaculated into the females and influence by the presence of ovarian maturation (This study was supported by a grant from the Ministry of Higher Education (PRGS), government of Malaysia under grant Vote No. 0000107972 00000 n
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We report here the cloning and in vitro functional analysis of an elongase from the orange mud crab, Scylla olivacea. Researchers also wish to extend their thanks to the involved personnel and Director, Institute of Tropical Aquaculture (AKUATROP), Universiti Malaysia Terengganu for providing facilities for the study.Experimental design for sperm analysis on wild-mated and captive-mated mud crabs, (a) Whitish spermathecae attached to the ovary of newly mated female and (b) Vas deference of male crabs x��W}P�~�n��rǁ@�9O��,�h&u�;rPJ��$W�1s���4�,��"Ơ|DF�܁��b�Qӌ'bk��&$�饥i�i;N��:ig�������W��;�ܾ_���=��}�E����0+R#���E �����k�P&���.���,�B�p,��Z�,ia�,��B-b0ns�"��ȹ�ω�`mL�3-��W1�d�Β�