Cobia Rachycentron canadum (Linnaeus, 1766)

Cobia is a high-value marine migratory pelagic finfish, distributed worldwide in tropical, subtropical and warm-temperate waters. Considered an important fish for mariculture

Activation of Prorennin

Purified prorennin appeared to be homogeneous when subjected to chromatography on a Diethylaminoethyl-cellulose and to electrophoreses in starch-urea-gel. Crystalline rennin was heterogeneous, and was resolved into six components when analyzed electrophoretically. When crystalline rennin was chromatographed on a column of Diethylaminoethyl-cellulose two distinguishable peaks were observed which corresponded to B- and C-rennin. Unlike crystalline rennin, rennin freshly activated at pH 2.0 or 5.0 was essentially homogeneous. Rennin resulting from activation at pH 2.0 and 5.0 appeared to be different. Rennin activated at pH 5.0 was eluted faster from Diethylaminoethyl-cellulose column, and moved slightly faster in starch-urea-gel electrophoresis, than rennin activated at pH 2.0. Amino acid analysis showed that rennin activated at pH 2.0 had more arginine and less proline than that activated at pH 5.0. This could be accounted for the differences in chromatographic and electrophoretic behavior of these rennins. Crystalline rennin exhibited more resistance to urea denaturation than prorennin. This suggested a fundamental difference in their secondary or (and) tertiary structures. It also showed the importance of intramolecular H-bonding for enzyme activity. An increase in crystalline rennin components was accompanied its prolonged exposure to 6 M urea. This was not the case with prorennin

Silver Pompano Trachinotus blochii (Lacépède, 1801)

Silver pompano is a commercially important high priced marine finfish, widely distributed in the East and West Coasts of India, Atlantic and Pacific Oceans. It forms an important candidate for cage aquaculture

Pengaruh Kepemimpinan terhadap Disiplin Kerja Karyawan pada Posmetro Mandau Duri

Tujuan dari penelitian ini adalah untuk mengetahui pengaruh kepemimpinan terhadap disiplin kerja karyawan pada Posmetro Mandau Duri. Hasil penelitian ini adalah kepemimpinan berpengaruh positif dan signifikan terhadap disiplin kerja karyawan pada Posmetro Mandau Duri

Broodstock development, breeding and larval rearing of cobia and pompano

Cobia (Rachycentron canadum) and silver pompano (Trachinotus blochii) are two marine finfish species with very high potential for aquaculture in India. Fast growth rate, adaptability for captive breeding, low cost of production, good meat quality and high market demand especially for sashimi industry are some of the attributes that make cobia an excellent species for aquaculture. In recent years the seed production and farming of cobia is rapidly gaining momentum in many Asian countries. Similarly, pompano is having fast growth rate, good meat quality and high market demand. Envisaging the prospects of cobia and pompano farming in India, broodstock development was initiated at the Mandapam Regional Centre of Central Marine Fisheries Research Institute in sea cages during 2008 and the first successful induced breeding and seed production was achieved for cobia in March – April 2010 and for pompano during July 2011

Intragenomic variations of multicopy ITS2 marker in Agrodiaetus blue butterflies (Lepidoptera, Lycaenidae)

The eukaryotic ribosomal DNA cluster consists of multiple copies of three genes, 18S, 5. 8S and 28S rRNAs, separated by multiple copies of two internal transcribed spacers, ITS1 and ITS2. It is an important, frequently used marker in both molecular cytogenetic and molecular phylogenetic studies. Despite this, little is known about intragenomic variations within the copies of eukaryotic ribosomal DNA genes and spacers. Here we present data on intraindividual variations of ITS2 spacer in three species of Agrodiaetus Hübner, 1822 blue butterflies revealed by cloning technique. We demonstrate that a distinctly different intragenomic ITS2 pattern exists for every individual analysed. ITS2 sequences of these species show significant intragenomic variation (up to 3.68% divergence), setting them apart from each other on inferred phylogenetic tree. This variation is enough to obscure phylogenetic relationships at the species level

Green Tiger Prawn Penaeus semisulcatus (De Haan, 1844)

Green tiger prawn is a commercially important penaeid shrimp species, dominant in the coastal waters of Tamil Nadu. Grows to 230 mm and 270 mm in TL in case of males and females, respectively

Knowledge and achievement motivation of marine fishers : A case of alternate livelihood options in Tamilnadu

In recent past, farming of marine fishes is being encouraged among the marine fishers to supplement the household income from capture fisheries, because the fish catch is declining. The study on extent of knowledge and achievement motivation of marine fishers’ adopting alternate livelihood options like sea cage farming, seaweed farming and ornamental fish culture was conducted in Ramanathapuram district of Tamil Nadu since many marine fisheries related activities are being undertaken in larger scale in comparison to other coastal districts. Overall analyses on level of achievement motivation reveal that majority of respondents who are adopting the alternate livelihood options are having medium to high level of achievement motivation. All the farming options have to be undertaken in the sea, which is a common property and it demands a common consensus in a particular village or region for taking up an activity in a desirable and profitable way. Hence, the need for personal achievement was present in majority of fishers, followed by personal achievement oriented influence and need for social achievement. The study found that fishers were able to perform better in the knowledge test since they gained adequate knowledge on all the alternate livelihood options