<abstract xmlns="http://www.w3.org/1999/xhtml">

Interspecific hybridization in the Cyprinidae family has been recorded worldwide, with <italic>Abramis brama</italic> (bream) and <italic>Rutilus rutilus</italic> (roach) as one of the often-reported hybridizing pairs. The only account of such an event in Bosnia and Herzegovina has been in Modrac Reservoir. Using morphological and molecular markers, the presence of hybrids was surveyed, the hybridization direction was determined and the hybrid group structure in this ecosystem was evaluated. Our findings confirmed unhindered natural hybridization between roach and bream in Modrac Reservoir. Over 50% of the hybrid specimens were classified as F2 hybrids by the NewHybrids software, while the rest were categorized as pure parental form, making it the first such finding in Europe. The analysis of mitochondrial cytochrome <italic>b</italic> showed that 90% of hybrid individuals were of bream maternal origin. The hybrid group expressed higher mean values of observed heterozygosity and gene diversity than both parental species. Signs of introgressive hybridization between parental species were detected. The hybrid zone of Modrac Reservoir appears to follow the intermediate or “flat” hybrid model based on the balanced distribution of parental and hybrid genotypes. Further investigation is needed to elucidate the factors that enable the survival and mating success of post-F1 individuals.
</abstract>

University of Sarajevo-Institute for Genetic Engineering and Biotechnology

University of Sarajevo-Faculty of Science

Molecular Structure and Hybridization Patterns of <italic>Abramis brama</italic> × <italic>Rutilus rutilus</italic> Hybrids from Modrac Reservoir, Bosnia and Herzegovina

<abstract xmlns="http://www.w3.org/1999/xhtml">

A total of 958 specimens of farmed common carp <italic>Cyprinus carpio</italic> from eight of the most significant and largest cyprinid aquaculture facilities in Macedonia (pond and cage culture systems) were examined for parasitological investigation for three years. The following parasite species of the genus <italic>Dactylogyrus</italic> were identified: <italic>Dactylogyrus extensus, Dactylogyrus minutus</italic> and <italic>Dactylogyrus anchoratus</italic>. The highest prevalence was determined for <italic>D. extensus</italic> (38.8%), followed by <italic>D. minutus</italic> (7.9%) and <italic>D. anchoratus</italic> (2.8%). The highest mean intensity was determined for <italic>D. extensus</italic> (6.2), followed by <italic>D. minutus</italic> (4.7) and <italic>D. anchoratus</italic> (3.8). By seasons, the highest prevalence (16.5%) was recorded for <italic>D. extensus</italic> in winter, while the lowest (0.6%) for <italic>D. minutus</italic> in autumn. The highest mean intensity (8.0) was also determined for <italic>D. extensus</italic> in winter, and the lowest (1.9) for <italic>D. minutus</italic> in spring.
</abstract>

Dactylogyrus Infestation in Farmed Common Carp <italic>Cyprinus carpio</italic> from Aquaculture Facilities in Macedonia

<abstract xmlns="http://www.w3.org/1999/xhtml">

Fish diversity of a riverine ecosystem became reduced due to different manmade and natural calamities. This study investigated the present fish biodiversity status of the Dharla River located (25.8103° N, 89.6487° E) in the northern part of Bangladesh from January to December 2018. In this study, the existing fish biodiversity status of the Dharla River was estimated in terms of diversity indices and threatened status (both global and local). Data was collected from the three sampling sites of the river using different fishing gears and three selected fish markets located in the Kurigram district of Bangladesh. A total of 76 fish species were identified belonging to 8 orders, 26 families and 57 genera. The Cyprinidae was the most dominant family represented by 14 species followed by the Danionidae (13 species), Bagridae (8 species) and few minor families. Apart from the indigenous species, nine exotic fish species were also recorded. The Shannon-Weaver diversity (<italic>H</italic>), Pielous evenness (<italic>e</italic>) and Margalef richness (<italic>D</italic>) indices ranged from 3.00 to 3.71, 0.62 to 0.94 and 3.94 to 7.95, respectively. Out of 76 indigenous species, 28 species (37%) were identified as threatened in Bangladesh, which included critically endangered (4), vulnerable (9) and endangered (15) species. Indiscriminate fishing through poisoning and destructive fishing gears were identified as the major threats to fish biodiversity of the Dharla River. Thus, the river serves as considerable support for threatened indigenous fishes. Therefore, necessary steps are needed to stop destructive fishing, establish permanent fish sanctuaries and proper monitoring for maintaining sustainable biodiversity in the Dharla River.
</abstract>

Faculty of Fisheries, Hajee Mohammad Danesh Science and Technology University (HSTU)

Fish Diversity and Its Threatened Status of the Dharla River in Bangladesh

<abstract xmlns="http://www.w3.org/1999/xhtml">

The present survey aimed to explore the fish fauna diversity, abundance and conservation status in the Jamuna River, a tributary of the River Brahmaputra, Bangladesh. During the study period from November 2018 to October 2019, a total of 55 species of fish were recorded, belonging to 6 orders, 20 families and 41 genera from the five selected stations near the river. Orders Cypriniformes and Siluriformes were recorded as the dominant group in the fish fauna community that comprises 34.55% and 30.91% of total species, respectively. Various types of Small Indigenous Species (SIS) and a total of 26 International Union for Conservation of Nature (IUCN) red-listed species were recorded. Population indices, viz. Shannon–Weaver index (H), Simpson’s dominance index (D), Simpson’s index of diversity (1-D), Margalef’s index (d) and Evenness (E), were applied to demonstrate the species diversity, richness and evenness of fish, and their overall values were 1.28-1.48, 0.26-0.33, 0.67-0.74, 1.22-1.46 and 0.77-0.86, respectively. To sustain the prospect of fisheries biodiversity in the Jamuna River of Bangladesh, different fish management and conservation plan of action specifically establishing and maintaining fish sanctuaries, banning indiscriminate fishing and the use of destructive fishing gears for the protection of the breeding and nursery grounds of fish should be taken into consideration with utmost priority.
</abstract>

Bangabandhu Sheikh Mujibur Rahman Agricultural University

Department of Agricultural Extension and Rural Development

Fish Biodiversity, Threat Status and Conservation Significance of the Jamuna River, Bangladesh

<abstract xmlns="http://www.w3.org/1999/xhtml">

Non-indigenous parasite fauna of freshwater fish has not been studied extensively in Croatia, despite the long history of introductions and translocations of alien fish species into inland waters. Negative implications for aquaculture production and wild native fish species have been frequently associated with the introduction of non-native parasite species. Hence, the present paper attempts to lay out a historical overview of the suspected localities, time frames and pathways of introduction for non-indigenous fish parasites into inland waters of Croatia, therefore producing a list of species. In total, 16 non-native fish parasites have been recorded in inland waters of Croatia, aquaculture establishments being identified as initial points of introduction. However, a paucity of information exists on the overall prevalence of infection as well as the economic impact on aquaculture production. In addition, limited information is available about the presence and potential ecological impact of non-indigenous parasites on endemic fish fauna in areas of high biodiversity, such as the water bodies of the Adriatic Sea Basin. Therefore, there is an urgent need and opportunity for multidisciplinary cooperation between different stakeholders, including government, scientists, in both biological and veterinary disciplines, and the industry, with the aim of extensive surveys to determine the potential impact on aquaculture production and wild fish population of high conservation value.
</abstract>

Non-Indigenous Parasites of Fish in Inland Waters of Croatia

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Croatian Journal of Fisheries

Volume 79 (2021): Issue 4 (December 2021)

Molecular Structure and Hybridization Patterns of Abramis brama × Rutilus rutilus Hybrids from Modrac Reservoir, Bosnia and Herzegovina

Dactylogyrus Infestation in Farmed Common Carp Cyprinus carpio from Aquaculture Facilities in Macedonia

Fish Diversity and Its Threatened Status of the Dharla River in Bangladesh

Fish Biodiversity, Threat Status and Conservation Significance of the Jamuna River, Bangladesh

Non-Indigenous Parasites of Fish in Inland Waters of Croatia

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