%%EOF 0000005310 00000 n 0000005434 00000 n However, mud crab populations are threatened by over exploitation and habitat degradation, and would benefit from resource management interventions. 0000018438 00000 n 0000007001 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. 0000010903 00000 n 0000001016 00000 n

[Keywords: New record, Scylla, morphometry, Goa, India] Introduction Mud crabs of the genus Scylla de Haan, … 0000107134 00000 n Scylla olivacea. 387 0 obj <> endobj Since, the captive-mated females were examined after 2 weeks of post-copulation, it can be assumed that wild-mated females used in the present study have been mated for more than 2 weeks. 0000005000 00000 n 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��|��

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back of the crab has a studs looking forming a U shape. The size of the males and the mated females of Scylla olivacea (A), S. tranquebarica (B), and Scylla paramamosain (C). (1998). 0000003438 00000 n The crab samples were transferred back to %PDF-1.4 %���� 0000005112 00000 n 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� The orange mud crab, Scylla olivacea, is regarded as an important fishery resource due to high demand and high market value. 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. 0000006186 00000 n 422 0 obj <>stream

0000153309 00000 n 0000009859 00000 n 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.

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
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). 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. Scylla olivacea (Herbst 1796) need to be determined and relate its histological appearance of the ovary to oocyte development. Further, minor phenotypic variations in the present S. olivacea specimens could be attributed to geographical isolation from existing populations. 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. Add BLAST: 12: Calcium binding i: 72 – 83: PROSITE-ProRule annotation. 0000004731 00000 n 0000107897 00000 n 0000018401 00000 n 0000004522 00000 n 0000107515 00000 n 0000107972 00000 n

However, this variable was not possible to be avoided since a medium is needed to obtain sperm suspension. <<0A1EDFAB85AC1D4FBDB44637417E06BB>]>> xref

0000007605 00000 n 0000005226 00000 n These crabs can survive out of water for extended periods as long as they are kept cool. 0000107590 00000 n Description Actions Graphical view Length Calcium binding i: 40 – 51: PROSITE-ProRule annotation. 0000004694 00000 n

Orange mud crab, Scylla olivacea is the most distributed mud crab species along the Malaysian coastal water. Present study suggests that, AR activation were influence by the presence of ovaries, in which sperms from males were mostly in inactive Stage 1.

They are among the most valuable crab species in the world, with the bulk of their commercial production sent live to market. 0000004018 00000 n Colour varies from red through brown to brownish/black depending on habitat. e�b�}�/>9s���Mu����=)����{n���I��4]J$o/����U׳���u5���}_��U����I���4���_�jNw�%�$�#�e�k��{(�q�e�(��M{�/���a��ᢱ���r�֟X�N���v�bq�w�U�J��T�ɕ�?�Z���־x�G�o�Χ�zZ[Sˎ�~po�k��s�jW���� (��v�p��Aݙ�_4�;�87�^8��\+4��z���V:h���9_����=*Dp�� yt*�A��ڐ_��AH��(�vgzkvhj�` ��;��NV ��ʾ�=u�M�A��}�3��X9�bGs�����J`6cK)y{���/�Ln��9�P��W�;�@y�.u����D�J��~�%��BՍ۵�uyM��%lr�Љ��3���� �P��,us`�S�/���T�@P#}�����l-hd8��K�7��o�%X\+5�\�*>(Ȑ��sH�jjN��I���*��r|�A��.v]�g>�CZ�`p�`�)/��v���zs`_���鏓��!BC~��=Qe������@��� 0000008163 00000 n 0000013553 00000 n

By determining this relationship, the use of ... olivaea was identified based on the description by Keenan et al. Tweet; Description: Body is rounded not a spiny edges with orange tip claws. We report here the cloning and in vitro functional analysis of an elongase from the orange mud crab, Scylla olivacea. Present study suggested that, activation of AR was related to the duration of sperm deposition into the spermathecae of females. Scylla olivacea (orange mud crab) Status. 0000003386 00000 n 0000009340 00000 n 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. 0000010397 00000 n

0000009629 00000 n 387 36 0000107209 00000 n 0000006308 00000 n 0000108282 00000 n

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