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Species Composition and Inshore Migration of the Tropical Glass Eels (Anguilla spp.) Recruiting to the Jali River, Purworejo Regency Indrawati, Ayuningtyas; Ibrahim, Putri Sapira; Yalindua, Fione Yukita; Kurniawan, Wanwan; Aisyah, Siti; Anggoro, Sutrisno; Saputra, Suradi Wijaya
Journal of Tropical Biodiversity and Biotechnology Vol 9, No 2 (2024): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jtbb.82880

Abstract

Purworejo Regency is located in the south coast of Java where rivers flow into the Indian Ocean. The Jali River in Purworejo becomes a migration route for eels where juvenile eels (glass eels) move from the ocean to freshwater passing through the estuary. During migration, glass eels will make efforts to survive, one of which is to manage their osmotic pressure (osmolarity). With regards to those, a study on the upstream migration of glass eels in Jali River was carried out. Glass eels samplings were conducted using hand-held lift nets at the new moon phase, from 20:00 pm to 4:00 am. Sampling stations included the estuary, a branch river, and below the dam. The osmolarity of both glass eels and media (river water) were measured. Furthermore, the chemical and physical parameters of the waters as the natural habitat for glass eels were also measured. Glass eel samples were then identified to species level. The results showed that glass eels entering the Jali River consisted of Anguilla bicolor bicolor and Anguilla nebulosa nebulosa with the former being the most common. Total length of glass eels ranged between 44.10 to 69.70 mm with total weights 0.08 to 0.54 g. Glass eel migration has a close relation with surface current and tide. The osmotic work level (OWL) of glass eels approaches 0.34 mOsm/l H2O which is close to iso-osmotic. This happened at salinity 0 o/oo so that the glass eels migrate to fresh water which has a lower salinity to achieve iso-osmotic condition. 
STRUKTUR KOMUNITAS IKAN PADANG LAMUN DI PERAIRAN BOLAANG MONGONDOW, SULAWESI UTARA Ibrahim, Putri Sapira; Yalindua, Fione Yukita; Indrawati, Ayuningtyas; Huwae, Rikardo
BAWAL Widya Riset Perikanan Tangkap Vol 13, No 2 (2021): (AGUSTUS) 2021
Publisher : Politeknik Kelautan dan Perikanan Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/bawal.13.2.2021.71-76

Abstract

Padang lamun Pantai Lolak-Sang Tombolang merupakan ekosistem yang memiliki keanekaragaman hayati yang tinggi pada daerah laut dangkal sehingga mampu mendukung potensi sumberdaya yang ada termasuk ikan. Ikan yang berasosiasi dengan ekosistem padang lamun merupakan ikan yang memiliki nilai ekonomi tinggi, seperti ikan-ikan dari famili Siganidae, Carangidae, Lutjanidae. Tujuan penelitian ini untuk menganalisis keanekaragaman jenis dan struktur komunitas ikan pada padang lamun di Perairan Lolak-Sang Tombolang Bolaang Mongondow, Sulawesi Utara. Metode penangkapan ikan dilakukan dengan swept area pada 5 stasiun berdasarkan persebaran lamun dan tingkat pemanfaatan masyarakat terhadap ekosistem padang lamun. Hasil yang ditemukan sebanyak 642 individu ikan dengan kelimpahan ikan pada setiap stasiun berbeda-beda dan spesies tertinggi yaitu Apogon nigrofasciatus (11,37%), diikuti oleh Halichoeres miniatus (8,26%), Siganus canaliculatus (6,54%), Halichoeres papilionaceus (6,39%), Monacanthus tomentosus (5,61%), Siganus spinus (3,89%), Pomacentrus coelestis (3,74%), Apogon margaritophorus (3,58%), dan Halichoeres argus (3,58%). Keanekaragaman spesies di Pantai Lolak-Sang Tombolang Bolaang Mongondow tergolong sedang dengan stabilitas komunitas berada dalam kondisi stabil, dengan indeks dominansi cenderung rendah.The seagrass meadow of Lolak-Sang Tombolang is an ecosystem with high biodiversity in shallow sea areas to support the potential of existing resources, including fish. Fish associated with seagrass ecosystems have high economic value, such as fish from the families Siganidae, Carangidae, Lutjanidae. This study aimed to determine the structure of the seagrass fish community in Lolak-Sang Tombolang Bolaang Mongondow waters of North Sulawesi. Data collection was carried out using the swept area method at 5 stations based on the distribution of seagrass and the level of community utilization of the seagrass ecosystem. Based on observations, the waters of Lolak-Sang Tombolang, North Sulawesi has seagrass fish species that are still relatively high in diversity. We found 642 individual fish with different fish abundances at each station. The tallest species was Apogon nigrofasciatus (11.37%), followed by Halichoeres miniatus (8.26%), Siganus canaliculatus (6.54%), Halichoeres papilionaceus (6.39%), Monacanthus tomentosus (5.61%), Siganus spinus (3.89%), Pomacentrus coelestis (3.74%), Apogon margaritophorus (3.58%), and Halichoeres argus (3, 58%). The diversity of species at Lolak-Sang Tomnolang Bolaang Mongondow is moderate with community stability in a stable condition and a low dominance index.