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Harini Nurcahya
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harininurcahya@gmail.com
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biodiversityjurnal@gmail.com
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INDONESIA
Journal of Tropical Biodiversity
Published by Universitas Nasional Jakarta
ISSN : -     EISSN : 27744116     DOI : -
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Immunology & microbiology
Journal of Tropical Biodiversity, ISSN : 2774-4116 (Online) is an international journal that publishes articles on all aspects of biological diversity-its description, analysis and conservation, and its controlled rational use by humankind. The scope of Biodiversity and Conservation is wide and multidisciplinary, and embraces all life-forms. published by Universitas Nasional Jakarta
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Hewan dan Zoologi
Articles 82 Documents
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External Quality Of Merawangarab Chicken Eggs With Different Genetic Composition Rafif Nurwansyah; Harini Nurcahya; Ikhsan Matodang; Sri Darwati
Journal of Tropical Biodiversity Vol 6 No 1 (2025): December 2025
Publisher : Universitas Nasional Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59689/bio.v6i1.329

Abstract

Eggs, as a food ingredient, possess complete nutritional value that is beneficial for human health, are readily available, affordable, and popular with the public. Likewise, hatching eggs provide the nutrients needed for the development of chicken embryos. Therefore, eggs for consumption as food and hatching eggs. The external quality of eggs is one indicator of egg quality. Merawang chickens and arab chickens are local Indonesian chickens. Crossbreeding of the two chickens is expected to produce superior offspring in production and egg quality. This study aimed to evaluate the external quality of merawangarab crossbred chicken eggs with different merawangarab genetic compositions (M), namely 25% M, 50% M, 62.5% M, and 75% M with a total of 30 hens. The materials used were eggs from merawangarab crossbred chickens. This study used a randomized block design (RAK) and continued with Tukey's further test. The external quality of eggs observed was shape index, egg weight, shell weight, and shell ratio. Different genetic compositions did not affect the external quality of merawangarab crossbred chicken eggs. Eggs from four crossbred merawangarab chickens were (25% M, 50% M, 62.5% M and 75% M) classified as small
Fish Diversity and Catch Composition of Purse Seine Fisheries Across Multiple Fishing Grounds in Weru Village, Lamongan Regency M Ainul Labib; Tatang Mitra Setia; Nonon Saribanon
Journal of Tropical Biodiversity Vol 6 No 1 (2025): December 2025
Publisher : Universitas Nasional Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59689/bio.v6i1.330

Abstract

Purse seine fisheries represent an important component of capture fishing activities conducted by local fishers in Weru Village, Lamongan Regency. However, spatial variations in catch composition and fish diversity across different fishing grounds are still poorly documented. This study aims to analyze fish community structure at four purse seine fishing locations through assessments of catch composition and ecological indices. Data were collected during July–August 2025 through direct observations at landing sites by recording the number of individuals for each species. Analytical procedures included the Shannon-Wiener Diversity Index (H’), Pielou’s Evenness Index (E), and Simpson’s Dominance Index (C) to evaluate community differences among locations. The results reveal clear spatial differences in fish community structure. In total, the purse seine fishery recorded 11 fish species with a total of 15,041 individuals across four fishing locations, indicating a marked disparity in catch abundance across the sites. Locations A and B were dominated by Hilsa kelee, with high catch numbers (3,886 and 7,286 individuals), resulting in low diversity (H’ = 0.18 and 0.06) and high dominance (C = 0.94 and 0.98). In contrast, location D demonstrated a more balanced and stable fish community structure, reflected in its notably higher diversity (H’ = 1.29), high evenness (E = 0.66), and low dominance (C = 0.40). These findings offer important baseline insights to support spatially informed management of small pelagic fisheries in the coastal.

Page 9 of 9 | Total Record : 82

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