AQUACOASTMARINE: Journal of Aquatic and Fisheries Sciences

Macroalgal Diversity in Intertidal Zone of Mbuluk Beach, Gunungkidul, Indonesia

Wed, 30 Apr 2025 00:00:00 +0700

Mbuluk Beach is one of the new tourist beaches in Kemadang Village, Tanjungsari District, Gunungkidul Regency, D. I. Yogyakarta. Mbuluk Beach is a small beach which is characterised by a rocky substrate along the coastal area and overgrown with macroalgae. This research aims to study the diversity of macroalgae in the intertidal zone of Mbuluk Beach and determine the physicochemical parameters that influence their distribution and diversity. This research was conducted on October 21st, 2023. The method used was systematic sampling for collecting samples and directly measuring physicochemical parameters. The calculated index of species diversity used is Shannon-Wiener’s formula. The result showed that seventeen species of macroalgae were identified, consisting of six species from Chlorophyta, two species from Phaeophyta, and nine species from Rhodophyta. The macroalgal diversity index in the intertidal zone of Mbuluk Beach is 1.9, which means that the level of species diversity is moderate. The type of substrate which is mostly rocky substrate and the physicochemical parameters obtained, including air temperature (22°C), water temperature (21.3°C), pH (7.4), salinity (35.1 ppt), light intensity (5219.5 Lux), characterized the environmental conditions in which the identified macroalgae species were present in the intertidal zone of Mbuluk beach

A review of the enzymes utilization in the feed for indigenous Indonesian fish

Tue, 29 Apr 2025 00:00:00 +0700

Enzymes play a vital role in improving nutrient absorption and digestion efficiency in fish feed, particularly for indigenous Indonesian fish species. This review aimed to comprehensively evaluate the current state of enzyme utilization in feed for native Indonesian fish, highlighting its benefits, challenges, and potential contributions to the advancement of sustainable aquaculture. It examined the role of endogenous enzymes and various exogenous enzymes, such as protease, lipase, phytase, Non-Starch Polysaccharides (NSP) enzymes, and multi-carbohydrase complexes, in enhancing feed efficiency and fish growth. The integration of these enzymes into feed formulations offers significant advantages in boosting growth performance, optimizing feed conversion efficiency, and promoting environmental sustainability. Additionally, this review discussed the potential benefits and challenges associated with enzyme application in fish feed. Looking ahead, the development of enzyme utilization in aquafeed holds great promise for enhancing the sustainability, efficiency, and productivity of the aquaculture sector. This review provides valuable insights into the potential of enzyme supplementation to maximize feed utilization for native Indonesian fish species, outlining both its advantages and challenges, while also exploring its future prospects in driving cost-effective and eco-friendly aquaculture practices.

Pengaruh Pengkayaan Nutrisi Cacing Sutra (Tubifex sp.) dengan Tepung Wortel (Daucus carota) dan Bit (Beta vulgaris) Terhadap Kualitas Warna Ikan Cupang (Betta sp.)

RhegitaMaulludda Gita, Eric Armando, Annisa Novita — Tue, 29 Apr 2025 00:00:00 +0700

Peningkatan kualitas warna tubuh ikan hias seperti ikan cupang (Betta sp) merupakan salah satu faktor penting dalam menunjang nilai jual dan daya tariknya. Salah satu upaya yang dapat dilakukan adalah melalui pemberian pakan alami yang diperkaya nutrisi. Penelitian ini bertujuan untuk mengevaluasi pengaruh suplementasi tepung wortel dan tepung bit pada cacing sutra (Tubifex sp.) terhadap kandungan nutrisi cacing serta dampaknya terhadap warna tubuh dan pertumbuhan ikan cupang. Penelitian dilaksanakan di Kramat Selatan, Magelang Utara, menggunakan metode Rancangan Acak Lengkap (RAL) dengan tiga perlakuan dan dua ulangan. Data dianalisis menggunakan Analysis of Variance (ANOVA) dan dilanjutkan dengan uji Duncan’s Multiple Range Test (DMRT). Variabel utama yang diamati meliputi kandungan nutrisi cacing sutra, intensitas warna tubuh ikan cupang, serta pertumbuhan bobot dan panjang ikan. Kualitas air dipantau sebagai variabel pendukung. Hasil penelitian menunjukkan bahwa suplementasi tepung wortel dan tepung bit meningkatkan kandungan nutrisi cacing sutra, terutama pada kadar abu, lemak, dan serat. Pemberian cacing sutra yang telah diperkaya tersebut berkontribusi terhadap peningkatan warna tubuh ikan cupang secara signifikan, dengan perlakuan P2 menunjukkan rata-rata intensitas warna sebesar 22,78% dan perbedaan nyata berdasarkan hasil analisis ANOVA dan DMRT (p<0,05). Kesimpulannya, suplementasi tepung wortel dan bit pada pakan cacing sutra efektif dalam meningkatkan kualitas nutrisi cacing dan memperbaiki kualitas warna tubuh ikan cupang