Chrisna Adhi Suryono

Studi Kelimpahan Gastropoda di Bagian Timur Perairan Semarang Periode Maret – April 2012

PO Box 208118, New Haven, CT 06520-8118 USA (203) 432-3154 fax (203) 432-5872 jmr@yale.edu www.journalofmarineresearch.org The Journal of Marine Research is an online peer-reviewed journal that publishes original research on a broad array of topics in physical, biological, and chemical oceanography. In publication since 1937, it is one of the oldest journals in American marine science and occupies a unique niche within the ocean sciences, with a rich tradition and distinguished history as part of the Sears Foundation for Marine Research at Yale University.

Seagrass Parameter Affect the Fish Assemblages in Karimunjawa Archipelago

Seagrass beds promote high species diversity, abundance and biomass, and become important habitats for some economically important fishes. Plants of seagrasses result in structurally highly complex habitats and offering feeding grounds, shelter from predation as well as nursery areas for diverse fish assemblages. However, research on fish communities in Southeast Asian seagrass bed is rarely conducted. In the present study fish assemblages in seagrass beds with different parameters (cover, diversity and similarity indices, domination) was investigated in the Karimunjawa Islands, Indonesia. The purpose of this study were to assess whether fish assemblages differ concerning on the abundance and the species number. This study was conducted on the seagrass bed on Karimunjawa Islands in Java Sea, particularly in the water of Menjangan Besar and Menjangan Kecil Island. Line-quadrant transect was used to assess seagrass data, while the occurrence and individual number of fish harboured in the selected seagrass bed was counted by using underwater visual census in the stationary point count transects. Seagrass cover in Menjangan Kecil Island (41%) with various canopy included both upper and lower canopy was considerable higher than those in Menjangan Besar Island (5%). Fish diversity, species composition and abundance are considerably different between the two study sites. This study revealed that seagrass density or cover and canopy structure affected the fish abundance and species number harboured.

Prospek Budidaya Kerang Darah (Anadara granosa) untuk Peningkatan Produktifitas Tambak di Kecamatan Tugu Semarang

Tujuan dari kegiatan ini adalah: meningkatkan produktifitas tambak kurang produktip dengan budidaya kerang darah. Metodologi pemecahan masalah yang digunakan adalah mengubah sistim budidaya monokultur menjadi sistim polikultur dua jenis komoditas yang berbeda yang dapat dibudidayakan secara bersamaan dalam satu tambak. Hasil kegiatan menunjukan mitra kerja (petambak) sangat berantusias untuk mengikuti kegiatan tersebut terlihat dari cara mereka yang mengubah sitim budidaya tambak dari monokultur ke polikultur kerang darah. Setelah mengikuti cara sistim polikultur petambak nampak puas dengan hasil peliharaannya karena kedua jenis biota dapat hidup bersama dan menunjukan pertumbuhan yang baik. Dari hasil kegiatan pengabdian ini dapat disimpulkan bahwa sistim budidaya polikultur .dapat meningkatkan produktifitas tambak. Kata kunci: Tambak, kerang dan produktifitas The aim of the activities was increasing productivity on unproductive brackishwater pound to change the culture system to culture cockle Anadara granosa. The method used to solve the problem was to change the system cultivation from monoculture to be poly-culture two different species which can live and cultivate together in one brackishwater pound.The result shows, the partners was very serious followed all the instruction cultivation process. It can be seen he has change the system of the monoculture cultivation to be poly-culture system which introduce two different species. The result of program showed the farmer (petambak) was very sustified cause of the species can lives together and shows the increasing of weight. The conclusion of the activities was the poly-culture system can improve brackishwater pound productivity. Key words: brakishwater pound, cockle and productivity