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

This study examined the effects of dietary supplementation of queen scallop <italic>Aequipecten opercularis</italic> with an indigenous strain of lactic acid bacteria (LAB), <italic>Lactiplantibacillus plantarum</italic> I, previously isolated from its digestive tract, on gut microbial populations and growth rates during cultivation under simulated climate change conditions (pH 7.8, T = 16 ± 2 °C). After one month of feeding, the results showed a noticeable reduction in aquaculture diseases causing pathogens while maintaining sufficient viable <italic>Lpb. plantarum</italic> I cells. A higher pH and temperature resulted in higher growth rates, measured by the weight and length of scallops, compared to the control group. The results obtained shed light on the influence of the addition of lactic acid bacteria on the growth of bivalve mollusks under normal and climate change conditions, and provide control of pathogenic microorganisms. In the context of climate change, host-pathogen interactions need to be recognized and put under control by applying natural solutions to minimize the environmental footprint.
</abstract>

Effect of Dietary Supplementation with <italic>Lactiplantibacillus plantarum</italic> I On Queen Scallop <italic>Aequipecten opercularis</italic> Under Simulated Climate Change Conditions

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

Devil firefish <italic>Pterois miles</italic> is an invasive alien species which has severely impacted biodiversity and ecological processes in invaded areas of the Mediterranean. In recent years, its presence has been documented in several countries of the Adriatic Sea. Based on the negative ecological and socio-economic impacts in other areas of the Mediterranean Sea, the potential invasiveness of devil firefish was analyzed for the coastal areas of the three eastern Adriatic countries (Albania, Croatia and Montenegro) using the <italic>Aquatic Species Invasiveness Screening Kit</italic>. Generally, based on the average value of the Basic Risk Assessment and the threshold used, the outcomes suggest that this species will be highly invasive in the eastern Adriatic countries. In addition, the results have shown that the most affected sector is represented by the local species populations and relative characteristics, while commercial sectors represent the least affected sector. However, considering that the negative impact of non-native species is not seen directly, the governments of these countries should address this issue as soon as possible.
</abstract>

Department of Aquaculture and Fisheries, Faculty of Agriculture and Environment

Potential Invasiveness of Devil Firefish <italic>Pterois miles</italic> (Bennett 1828) in the Eastern Adriatic Sea

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

<italic>Magallana bilineata</italic> is a commercially important oyster species in Malaysia. Despite its economic significance, the biology and ecology of this species, particularly its reproductive cycle, are poorly understood in the region. Therefore, this study aimed to investigate the reproductive cycle of <italic>M. bilineata</italic> in Mengkabong Bay, Tuaran, Sabah and its correlation with environmental factors. A total of 105 oyster specimens were collected and examined to determine the sex ratio, gonad developmental stages, maturity index (MI), and condition index (CI). The results revealed a sex ratio of 1:2.36 (♂:♀) in the oyster population of the bay, with a significantly higher proportion of females (<italic>P</italic> &lt; 0.05). Hermaphroditism was detected in 1.90% of the samples. <italic>M. bilineata</italic> was found to spawn throughout most months in the bay, with the highest MI and CI values recorded in November 2019 when most oysters were in mature or maturing stages. Salinity was found to be the primary factor influencing male gonad maturation, while temperature was the primary factor influencing female gonad maturation. Understanding the reproductive biology of this species is crucial for predicting its future survival and facilitating assisted spawning and hatchery spat production, thereby ensuring the conservation and sustainability of the oyster fishery in Malaysia.
</abstract>

Reproductive Biology and Spawning Pattern of Oyster <italic>Magallana bilineata</italic> in Mengkabong Bay, Sabah, Malaysia

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

<italic>Chlamydomonas</italic> spp. and <italic>Chlorella</italic> spp. are plankton genera that can be used to determine the level of balance in the aquatic environment. The purpose of this study is to determine the abundance of plankton <italic>Chlamydomonas</italic> spp. and <italic>Chlorella</italic> spp. and its relation to the clinical performance of red tilapia in silvofishery ponds. The research method used is an <italic>ex post facto</italic> causal design with random sampling. The results showed that the water quality in the silvofishery ponds was very good, except for the nitrate parameters of 0.00-1.50 mg/L and salinity of 2-11 gr/L, which exceeded the quality standards. In the silvofishery ponds, 5 plankton classes were found, namely Chlorophyceae, Cyanophyceae, Chrysophyceae, Protozoa, and Dinophysis, consisting of 15 genera. The dominant class Chlorophyceae had an abundance of 2.88E+06 cells/ml. The class Chlorophyceae is dominated by <italic>Chlorella</italic> spp. (2.63E+06 cells/ml) and <italic>Chlamydomonas</italic> spp. (2.20E+05 cells/ml). The abundance of <italic>Chlamydomonas</italic> spp. in silvofishery ponds is closely related to phosphate solubility (0.988). Based on observations of clinical symptoms on the eyes, gills, and fins of fish, no disease infections or physical abnormalities were found in the fish cultured in silvofishery ponds. Fish tend to live well with a growth rate of 0.44 g/day. The aquatic ecosystem of the silvofishery pond, which is dominated by the plankton <italic>Chlorella</italic> spp. and <italic>Chlamydomonas</italic> spp., had a good effect on the performance and condition of the farmed fish. This study concludes that the abundance of <italic>Chlamydomonas</italic> spp. and <italic>Chlorella</italic> spp. was very dominant compared to other plankton genera. The presence of <italic>Chlamydomonas</italic> spp. and <italic>Chlorella</italic> spp. illustrates good and stable environmental conditions in silvofishery ponds, followed by no clinical signs of disease infection in the fish reared during the study period.
</abstract>

Department of Aquaculture, Faculty of Fisheries

Department of Aquaculture, Faculty of Agriculture and Natural Resources

Relationship Between Abundance of <italic>Clamydomonas</italic> spp and <italic>Chlorella</italic> spp on Clinical Performance of Red Tilapia <italic>Oreochromis niloticus</italic> in Silvofishery Ponds

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

The aim of this study is to analyse the development of artisanal fish catch by species in the Croatian section of the Sava River. For Abramis brama and <italic>Silurus glanis</italic>, a significant decline in catches (in kg) was observed throughout the study period (2004-2021). Since 2013, this has also been the case for <italic>Cyprinus carpio, Esox lucius, Sander lucioperca,</italic> other autochthonous species and alochthonous species, while catches of <italic>Leuciscus idus</italic> have declined significantly since 2014. The catches of three species (<italic>Acipenser ruthenus, Leuciscus aspius</italic> and <italic>Tinca tinca</italic>) fluctuated without a trend, which can be attributed to the low quantities. This decline in catches of the most sought-after species in the Sava was greater than that of the other less sought-after autochthonous species (mainly other cyprinids), whose share of the total catch increased significantly.
</abstract>

Decline of Artisanal Fish Catch by Species in the Croatian Section of the Sava River

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Croatian Journal of Fisheries

 The Croatian Journal of Fisheries was established in 1938 and today possesses a long-term tradition of publishing papers that deal with both freshwater and marine fisheries. Areas covered by the Journal include ichthyology, aquaculture, ecology and diseases of fish and other aquatic organisms, problems of open waters and other topics related to the fisheries field.  Prior to publication, articles pass through rigorous review by senior scientists from around the world. The Journal features articles that reflect original research, interpretative content and subject matter of interest to the fisheries profession. The journal owner Faculty of Agriculture (FAZ) University of Zagreb, founded in 1919, is the leading higher education and scientific institution in the field of agriculture and related sciences in the Republic of Croatia, occupying an important position within the country's educational, scientific and research system. The FAZ organization is based on 28 departments with 417 members of the staff and 6 experimental stations.  The Croatian Journal of Fisheries (CJF) is committed to real and immediate open access for academic work. All of the CJF’s articles are free to access immediately from the date of publication. There are no author charges (APCs) prior to publication, and no charge for any reader to download articles and reviews for their own scholarly use. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author (see Copyright). This is in accordance with the BOAI definition of open access. To facilitate this the CJF depends upon the financial underwriting provided by the Croatian Ministry of Science, Education and Sport, Faculty of Agriculture, Croatian Chamber of Economy, journal subscribers, the goodwill of its editorial team and the continuing support of its network of peer reviewers.  Copyright:  Commercial distribution of journal articles in any form (printed or digital) is strictly forbidden. All published content in CJF is licensed under Creative commons Attribution-NoDerivs 3.0 licence. Authors of articles published in CJF retain the copyright of their articles and they are free to reproduce and disseminate their work under the terms of the Creative commons Attribution which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.  Why subscribe and read:  CJF is an English-language (additional abstract in Croatian language) peer-reviewed quarterly journal, publishing original research papers from the wide area of fisheries. It contains editorials, original scientific papers, preliminary and short communications, review papers, professional papers and supplements to fishing profession authored by researchers from all over the world, who appreciate fast, fair and constructive peer review provided by experts in the field of our profile. CJF reviewers have prompt and rapid response to the authors according to the schedule. At the time of paper submission, author will get unique paper ID and can check their paper status online. Also, CJF has simple and standard Template which can ease the submission procedure.  Why submit:  By submitting manuscripts in Croatian Journal of Fisheries authors can rely on fast peer review process and thorough editing by sector experts. CJF changed the Editorial Board to the Associate Editors system. In this way papers are more rigorously reviewed and the reviewing process is much faster. Consequently, the published papers are of much better quality.  Rejection rate:   30%   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 

Croatian Journal of Fisheries

Volume 82 (2024): Issue 1 (March 2024)

Effect of Dietary Supplementation with Lactiplantibacillus plantarum I On Queen Scallop Aequipecten opercularis Under Simulated Climate Change Conditions

Potential Invasiveness of Devil Firefish Pterois miles (Bennett 1828) in the Eastern Adriatic Sea

Reproductive Biology and Spawning Pattern of Oyster Magallana bilineata in Mengkabong Bay, Sabah, Malaysia

Relationship Between Abundance of Clamydomonas spp and Chlorella spp on Clinical Performance of Red Tilapia Oreochromis niloticus in Silvofishery Ponds

Decline of Artisanal Fish Catch by Species in the Croatian Section of the Sava River

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