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All Journal Jurnal Agroqua: Media Informasi Agronomi dan Budidaya Perairan
Neksidin
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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MOLECULAR IDENTIFICATION AND PHYLOGENETIC ANALYSES OF ECTOPARASITES AND ECTOSYMBIONTS THAT INFECT BLUE SWIMMING CRABS (PORTUNUS PELAGICUS) Heirina, Anna; Murtini, Sri; Neksidin
Jurnal Agroqua: Media Informasi Agronomi dan Budidaya Perairan Vol 22 No 2 (2024): Jurnal Agroqua
Publisher : University of Prof. Dr. Hazairin, SH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32663/ja.v22i2.4740

Abstract

The decline in blue swimming crab populations can be caused by overfishing and several factors of the aquatic environment, such as anthropogenic pollution, water quality and the presence of ectoparasite in the crab. Molecular studies are essential to validate a particular species of ectoparasites and ectosymbionts that infect Crab. A total of 143 crabs were sampled from fishermen in Demak, Muara Gembong and Labuhan Maringgai. Six ectoparasite and ectosymbionts species, Chelonibia testudinaria (Crustacea), Dianajonesia tridens (Crustacea), Octolasmis angulata, O. warwicki (Crustacea), Ostrea puelchana (Mollusca) and Thompsonia sp. (Crustacea) were isolated. Three ectoparasite and ectosymbionts species that were successfully validated based on the COI mtDNA genes were C. testudinaria, D. tridens, Oc. angulata. Validation of isolated ectoparasites infecting P. pelagicus was performed using the mtDNA marker COI gene to identify three ectoparasite species molecularly, namely C. testudinaria, D. tridens, and Oc. angulata. The results of the five sample analyses of ectoparasites based on the number of specific nucleotide sites in each sample show that the suspected species C. testudinaria, D. tridens and Oc. angulata had missense mutations.
Efektivitas Rumpon Sebagai Struktur Habitat Dalam Menekan Kanibalisme Pada Benih Ikan Baung (Mystus nemurus) Di Kolam Bulat Sri Murtini; Kadek Adi Suwandana; Neksidin; Selviana Anggraini; Mahadi Suroso
Jurnal Agroqua: Media Informasi Agronomi dan Budidaya Perairan Vol 24 No 1 (2026): Jurnal Agroqua
Publisher : University of Prof. Dr. Hazairin, SH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32663/ja.v24i1.5456

Abstract

This study investigated the effectiveness of artificial shelter structures (rumpon) in reducing cannibalism and improving the survival rate of baung fish (Mystus nemurus) fry cultured in circular ponds. Cannibalism is one of the major constraints in baung fish hatchery production because it significantly decreases fry survival and productivity. A Completely Randomized Design (CRD) consisting of four treatments, namely control (without rumpon), full rumpon, ¾ rumpon, and ½ rumpon, with three replications for each treatment was applied. Parameters observed included survival rate and water quality (temperature, pH, and dissolved oxygen). Data were analyzed using analysis of variance (ANOVA), while water quality parameters were analyzed descriptively. The results showed that the full rumpon treatment produced the highest survival rate (56%), followed by ½ rumpon (50%), ¾ rumpon (45%), and control (13%). The presence of rumpon increased habitat complexity, reduced direct interactions among fry, minimized cannibalistic behavior, and consequently improved survival. This study demonstrates that coconut leaf rumpon can serve as a simple, environmentally friendly, and low-cost habitat modification technology to enhance baung fish hatchery performance.
Co-Authors Heirina, Anna Kadek Adi Suwandana Mahadi Suroso Selviana Anggraini Sri Murtini sri murtini .