Indonesia has a wide variety of fish resources and one of them is yellowfin tuna. Tuna in Palabuhanratu is caught by Tonda and swamp tuna. Tuna is an export commodity that causes an increase in catches and requires proper management of fish resources. One of the information needed in fisheries management is the relationship between weight-length and fish condition factors. The purpose of this study is to determine growth pattern and factors of yellowfin tuna conditions landed at Palabuhanratu Fishing Port. The study was conducted in Palabuhanratu from September 2021 to January 2022. Data collection was carried out at the fish landing site at Palabuhanratu Fishing Port. The data collected in this study consisted of primary data and secondary data. Primary data consist of data on the length and weight of the fish. As many as 200 yellowfin tuna was measured their total length and weight. The total lengths of the measured tuna ranged from 30.9 - 101.9 cm. The growth pattern model analysis showed b value of 2.7. This indicates that yellowfin tuna in the study area had a negative allometric growth pattern (b<3), which explains that the length gained was faster than the weight gained. Tthe condition factor of the yellowfin tuna fish ranged from 0.70 – 1.54, with an average of 1.0. The condition factor is influenced by the availability of food because Indian Ocean is available with sufficient food because the Indian Ocean is famous for its upwelling area.
Abstract. Manangkalangi E, Sembel L, Tebaiy S, Manuputty A, Rumayomi MR, Musyeri P, Sawaki D, Orissu D, Manumpil AW, Kaber Y. 2022. Evaluation of seagrass beds as a foraging and nursery habitat based on the structure of the fish community in Nusmapi Island, West Papua, Indonesia. Biodiversitas 23: 5539-5550. Seagrass beds are one of the ecosystems inhabited by various coastal aquatic fauna, including fish. However, information on the temporal role of this ecosystem for fish fauna, particularly diurnal and nocturnal, is still limited. Therefore, this study was conducted to describe daily variations in the fish species composition, their ecological index, developmental stages, and trophic groups in a seagrass bed on Nusmapi Isl., Manokwari. The species composition differed between day and night sampling periods based on the results obtained from 40 species of fish belonging to 21 families and 7 orders. Furthermore, fish species consisted of three trophic groups (omnivores, carnivores, and herbivores), with omnivores and carnivores dominating during the day and at night by 48.6% and 87.5%, respectively. Species found in seagrass beds majorly consisted of juvenile stage individuals (65.9%). Individual abundance varied from day to night and was mainly found among group-forming species, such as S. spinus, S. trilineata, S. punctatissimum, and M. pralinia. The index of diversity, evenness, and dominance at the two relatively similar sampling times described the overall stability of fish communities in seagrass beds. The results indicate that seagrass beds serve as foraging and nursery grounds for many fish species in coastal waters. In addition, the management and protection of fish biodiversity and coastal fishery resources are affected by the ecosystem function.
Kawasan pesisir memiliki peran yang penting sebagai ekosistem pendukung dari vegetasi khususnya mangrove. Namun di sisi lain, tekanan pembangunan membutuhkan lahan yang strategis diantaranya daerah pesisir tersebut. Hal ini terjadi secara khusus juga di kawasan pesisir sekitar Kabupaten Manokwari. Oleh karena itu, penelitian ini dilakukan untuk mengamati perubahan kawasan vegetasi khususnya mangrove dengan menggunakan pendekatan pengindraan jauh. Metode yang dilakukan adalah menganalisis kawasan mangrove pada dua periode yaitu tahun 2002 dan 2021. Selanjutnya, data yang diperoleh dalam bentuk luasan dibandingkan dan juga dioverlay dengan layer dari jalan, sungai, dan bangunan. Hasil penelitian menunjukkan bahwa terdapat penurunan luasan kawasan mangrove khususnya di daerah timur lokasi penelitian. Faktor pembangunan diduga menjadi penyebab karena terdapat konversi kawasan mangrove tersebut menjadi pemukiman dan kegiatan ekonomi. Hasil penelitian ini diharapkan dapat memberikan perhatian kepada pemerintah agar dapat memberi perhatian terhadap pengelolaan kawasan pesisir yang mana menjadi ekosistem dari vegetasi mangrove. Di sisi lain, konsep pembangunan berkelanjutan harus bisa mengakomodasi penurunan kawasan mangrove pada masa yang akan datang.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.