Struktur Populasi Dan Masa Reproduksi Udang Regang

DAISY WOWOR. 1985. Population structure and spawning period of Udang Regang (Macrobrachium sintangense). BeritaBiologi 3(3): 116- 120. Population structure and spawning period of Macrobrachium sintangense was observed in a coast of a small artificial lake, Situ Ciletuh, Ci gombong, West Java, from December 1981 to August 1982. Examination of the class-size frequency indicated the growth rate of body length of the population, and its spawning periods.The mean growth rate of carapace was 3.44 mm per month.Sex ratio was 1:1, significant at the 95% level. The number of the larger males is greater than the females, which indicate the phenomenon of sexual dimorphism.This is due to the differences of growth and the maximum body size attained by the males and females. It was observed that M. sintangense spawns throughout the year, maximum spawning activity occurs between March and June

Pengaruh Pemberian Tiga Macam Makanan Buatan Terhadap Laju Pertumbuhan Udang Regang Macrobrachium Sintangense

Salah satu problem utama dalam pemeliharaan kadang ialah pemenuhan kebutuhan akan makanan tambahan bagi pertambahan laju pertumbuhan iLing 1972, Willis et al 1976, Suharto 1977) yang efisien.Makanan tambahan tersebut dapat berupa cacahan daging, makanan kering atau bentuk-bentuk lainnya. Mulai awal September 1979 sampai dengan pettengahan November 1979 telah diadakan pengamatan terhadap laju pertumbuhan udang regang Macrobrachium sintangense (de Man) yang diakibatkan karena pemberian tiga macam makanan buatan yang dibuat dari bahan makanan yang sederhana.Udang tersebut adalah udang air tawar yang umum dijumpai dan dapat dipelihara di akuarium tanpa banyak mengalami kesukaran dan perlakuan (Sabar, 1979)

PENGARUH PEMBERIAN TIGA MACAM MAKANAN BUATAN TERHADAP LAJU PERTUMBUHAN UDANG REGANG MACROBRACHIUM SINTANGENSE

Salah satu problem utama dalam pemeliharaan kadang ialah pemenuhan kebutuhan akan makanan tambahan bagi pertambahan laju pertumbuhan iLing 1972, Willis et al 1976, Suharto 1977) yang efisien.Makanan tambahan tersebut dapat berupa cacahan daging, makanan kering atau bentuk-bentuk lainnya. Mulai awal September 1979 sampai dengan pettengahan November 1979 telah diadakan pengamatan terhadap laju pertumbuhan udang regang Macrobrachium sintangense (de Man) yang diakibatkan karena pemberian tiga macam makanan buatan yang dibuat dari bahan makanan yang sederhana.Udang tersebut adalah udang air tawar yang umum dijumpai dan dapat dipelihara di akuarium tanpa banyak mengalami kesukaran dan perlakuan (Sabar, 1979)

STRUKTUR POPULASI DAN MASA REPRODUKSI UDANG REGANG

DAISY WOWOR. 1985. Population structure and spawning period of Udang Regang (Macrobrachium sintangense). BeritaBiologi 3(3): 116- 120. Population structure and spawning period of Macrobrachium sintangense was observed in a coast of a small artificial lake, Situ Ciletuh, Ci gombong, West Java, from December 1981 to August 1982. Examination of the class-size frequency indicated the growth rate of body length of the population, and its spawning periods.The mean growth rate of carapace was 3.44 mm per month.Sex ratio was 1:1, significant at the 95% level. The number of the larger males is greater than the females, which indicate the phenomenon of sexual dimorphism.This is due to the differences of growth and the maximum body size attained by the males and females. It was observed that M. sintangense spawns throughout the year, maximum spawning activity occurs between March and June

EXPLORING THE DYNAMICS DURING COMMUNITY ASSEMBLY THROUGH COMMUNITY PHYLOGENETICS

Species diversify through speciation and accumulate in ecological community, a process known as community assembly. Relying on both evolutionary mechanisms acting at regional scale and ecological mechanisms acting at local scale, the process of community assembly results from intricate interactions among mechanisms at play across varying spatial and temporal scales. During the last decade, community assembly theory has been reconsidered in the light of evolutionary dynamics of species diversification and ecological dynamics have been formalized in an explicit spatial framework (i.e. metacommunity theory). The aims of the present review are: (1) to present the community assembly theory and the main paradigms that have been proposed, (2) to discuss how the metacommunity theory as defined an explicit spatial framework for community ecology, (3)to discuss the potential mechanisms at play during community assembly and their associated predictions, (4) to present new approaches to study community assembly based on phylogenetics approaches and discuss how they have been integrated in empirical studies

Aplikasi Dna Barcode Pada Penentuan Spesies Udang Air Tawar Yang Berasal Dari Provinsi Jambi

Provinsi Jambi memiliki hutan hujan tropis dataran rendah yang mengalami deforestasi tercepat di daerah Asia. Efek dari Perubahan alih fungsi hutan ke habitat pertanian akan mengubah kondisi ekosistem. Hal tersebut diduga berpengaruh pada keanekaragaman makroinvertebrata di dalamnya. Kesalahan identifikasi morfologi dapat disebabkan oleh fenomena cryptic species maupun siblings species. Fenomena tersebut dapat menyebabkan masalah sinonim yaitu terdapat nama ganda pada satu spesies yang sama. Untuk menyelesaikan permasalahan tersebut dapat digunakan teknik DNA Barkode. Penelitian ini bertujuan untuk mengidentifikasi dan memastikan spesies udang air tawar yang berasal dari provinsi Jambi dengan mengaplikasikan teknik DNA barcoding.Berdasarkan identifikasi morfologi didapatkan 3 sampel terdiri dari satu famili. Berdasarkan analisis COI gene, 2 spesies berhasil diidentifikasi yaitu Macrobrachium malayanum dan M. pilimanus. Satu spesies sampel target yaitu M. malayanum 1 terbukti sebagai spesies M. malayanum yang sesuai dengan data GenBank

EFEKTIVITAS JENIS ALAT TANGKAP DAN JENIS UMPAN YANG DIGUNAKAN UNTUK MENANGKAP UDANG AIR TAWAR DI DANAU KAMPUS INSTITUT PERTANIAN BOGOR

Studi mengenai penangkapan udang air tawar dengan metode eksperimental fishing telah dilakukan di Danau Kampus Institut Pertanian Bogor. Penelitian ini bertujuan untuk mengetahui efektivitas penangkapan udang air tawar dengan menggunakan alat tangkap Tray net dan bubu yang diberi tiga jenis umpan yang berbeda, yaitu terasi, pelet pakan ikan dan kelapa bakar. Alat tangkap tray net lebih efektif dibandingkan bubu dalam penangkapan udang, namun umpan terasi yang dimasukkan kedalam perangkap bubu adalah umpan yang paling efektif diantara ketiga jenis umpan yang diberikan. Udang air tawar yang diperoleh diidentifikasi dan didapatkan dua jenis udang yaitu Macrobrachium lanchesteri dan Caridina propinqua sebanyak 474 individu

Habitat Preferences and Distribution of the Freshwater Shrimps of the Genus Caridina (Crustacea: Decapoda: Atyidae) in Lake Lindu, Sulawesi, Indonesia

AbstractThe objectives of this study were to reveal ecological preferences and distribution of all species of Caridina found in Lake Lindu and their catchment area. Specimens from 39 sampling sites were caught using tray net and hand net. There are three species of Caridina found in the lake system, i.e. Caridina linduensis, Caridina kaili and Caridina dali. There is no overlapping distribution among the species. Caridina kaili is a true riverine species and it is never encountered sympatric with C. dali nor C. linduensis. This species is abundant in streams and ditches with moderate flow running water and gravel–cobble substrate. It is mainly spread within streams west to the lake. Both C. dali and C. linduensis can be found in the lake and streams with very slow current to almost stagnant water, muddy sand substrate and associated with roots of water plants and leaf litter. However, C. dali is never occurred together with C. linduensis and they are less abundant compare to C. kaili. Distribution of Caridina spp. in Lake Lindu is probably affected by the temperature of their habitats and the occurrence of introduced fish such as Mozambique tilapia (Oreochromis mossambicus), common carp (Cyprinus carpio), and an alien riceland prawn (Macrobrachium lanchesteri). These introduced and alien species can have the potency to become predators or competitors for the Caridina spp. It is also the first record for M. lanchesteri present in Lake Lindu

Paleo-Drainage Basin Connectivity Predicts Evolutionary Relationships across Three Southeast Asian Biodiversity Hotspots

Understanding factors driving diversity across biodiversity hotspots is critical for formulating conservation priorities in the face of ongoing and escalating environmental deterioration. While biodiversity hotspots encompass a small fraction of Earth's land surface, more than half the world's plants and two-thirds of terrestrial vertebrate species are endemic to these hotspots. Tropical Southeast (SE) Asia displays extraordinary species richness, encompassing four biodiversity hotspots, though disentangling multiple potential drivers of species richness is confounded by the region's dynamic geological and climatic history. Here, we use multilocus molecular genetic data from dense multispecies sampling of freshwater fishes across three biodiversity hotspots, to test the effect of Quaternary climate change and resulting drainage rearrangements on aquatic faunal diversification. While Cenozoic geological processes have clearly shaped evolutionary history in SE Asian halfbeak fishes, we show that paleo-drainage re-arrangements resulting from Quaternary climate change played a significant role in the spatiotemporal evolution of lowland aquatic taxa, and provide priorities for conservation efforts. [Freshwater; geology; halfbeak; island radiation; Miocene; Pleistocene; river; Southeast Asia.