<abstract xmlns="http://www.w3.org/1999/xhtml">Pelagic fisheries in the area of the eastern part of the Adriatic Sea, more precisely in the Croatian fishing grounds, are one of the most important types of fisheries in Croatia. In this paper, the quantitative and qualitative structure of catches obtained by the „ciplara“ purse seine in the Croatian part of the Adriatic Sea was analysed between 2013 and 2018. According to the data collected, the largest catches by this fishing gear were made in the coastal area, precisely in the fishing zones/sub-zones A/A4, E/E2, F/F2, C/C4 and G/G1. 70% of the catches consisted of targeted species, which indicates that the studied „ciplara“ purse seine is a selective fishing gear. Biological analyses are given for four target species.</abstract>

Qualitative-Quantitative Analysis of the „Ciplara“ Purse Seine Catches in the Adriatic Sea

<abstract xmlns="http://www.w3.org/1999/xhtml">The physico-chemical parameters, plankton and macro-benthic invertebrates of the Lagos Lagoon (Badore, Ajah), Lagos State, Nigeria were studied between February and July 2018 at four sampling stations in a disparate range of human activities and impact. The result of phytoplankton analysis indicated a total of 56 genera with 40 genera within Bacillariophyta, accounting for 72% of the abundance. Zooplankton comprised 26 genera with 82% of the abundance of crustacea. The benthic macroinvertebrates were composed of mollusca, arthropoda and annelida. Results also indicated that the main drivers affecting the abundance and distribution of planktonic and benthic invertebrates were water temperature, pH, TDS and EC. The monthly variations of physico-chemical parameters in the Lagoon could be the result of human activities associated with transportation, fishing and domestic sewage disposal from the surrounding settlements. Therefore, it is necessary that relevant authorities keep in check some of these activities around the Lagoon as well as educate the population on the necessity for the conservation of these water resources.</abstract>

Faculty of Science, Department of Zoology

Faculty of Sciences, Department of Animal and Environmental Biology

Anthropogenic Impact on Plankton and Benthos Assemblage in the Lagos Lagoon, Nigeria

<abstract xmlns="http://www.w3.org/1999/xhtml">The most commonly farmed fish species in Bosnia and Herzegovina’s aquaculture are from the family Salmonidae, including brook trout <italic>Salvelinus fontinalis</italic> which is reared both for consumption and stocking purposes. A number of farmers complained about the elevated frequency of anatomical deformities in the smolts and fingerlings of brook trout, decreasing their fitness rate and causing significant financial loss. Since it has been shown that occurrence of deformities is correlated with the low genetic diversity and high inbreeding, this study aimed to assess intra- and interpopulation diversity of <italic>Salvelinus fontinalis</italic> from different freshwater fish farms in Bosnia and Herzegovina by observing variation in mitochondrial and nuclear genome. Total of 109 samples of brook trout from three hatcheries located at the Neretva River were analyzed for the mitochondrial control region and seven nuclear microsatellite loci. Both PCR-RFLP and sequencing revealed only one haplotype of the control region in all investigated trout. Overall, a low number of genotypes was evident across all the observed loci. Values of genetic diversity and polymorphic information content followed the increase in the number of alleles per locus. In general, values of inbreeding coefficient were generally very high, while the genetic diversity and observed heterozygosity had low rates. The results of our study are congruent with the findings of previous studies in which developmental deformities were concomitant with the low genetic diversity and inbreeding depression. It is, therefore, strongly advised to regularly supplement the broodstock with new, unrelated individuals, as it is of vital importance for sustaining a satisfying level of genetic diversity and preventing inbreeding depression. Additionally, maintaining good management practices regarding the fluctuation of water temperature, exposure to pollution, nutrition, etc., will further contribute to the prevention of this detrimental condition.</abstract>

Genetic Characteristics of Brook Trout <italic>Salvelinus fontinalis</italic> (Mitchill, 1848) Broodstocks from Hatcheries in Bosnia and Herzegovina

<abstract xmlns="http://www.w3.org/1999/xhtml">Marine Protected Areas and other managed marine sites are designated to improve the status of coastal fish assemblages and protect valuable habitats. The implementation of management practices relies on data collected through monitoring activities. The monitoring of fish assemblages using the standard non-destructive methods requires significant financial resources and time. A new approach to monitoring fish assemblages in the coastal waters was recently implemented in the Mediterranean – Fish Assemblage Survey Technique (FAST). It is based on Citizen Science where trained volunteer divers collect the data following a pre-established protocol. Considering the differences in species presence/absence and their sizes between the Mediterranean and the Adriatic Sea, a modification of the method was necessary. This study presents 23 main fish species and four ‘<italic>joker</italic>’ species selected for the Croatian FAST list and their respective sizes that will be considered Large (>2/3 of the total size) for implementing the method in the Croatian part of the Adriatic Sea.</abstract>

Department of Ecology, Agronomy and Aquaculture

Fast, Not Furious - Adaptation of the Species List and Fish Size Classes for Fish Assemblage Survey Technique (FAST) for the Adriatic Sea

<abstract xmlns="http://www.w3.org/1999/xhtml">Evaluation of histamine levels at various stages of manufacturing fish meal made from European pilchard <italic>Sardina pilchardus</italic> by-products was conducted on two batches which are distinguished by the quality of raw materials expressed through total volatile basic nitrogen (TVBN) content. The goal was also to assess the impact of the reuse of the concentrated stickwater, the liquid from the pressing process of fish meal. The results revealed that the level of raw material deterioration influenced the level of histamine in the finished product. When the freshness of the raw material is acceptable (TVBN content: 30 mg/100 g), histamine contents recorded in the finished product remain clearly below the limit value of 500 ppm. In this case, incorporation of concentrated stickwater into press cake before drying did not affect the concentration of histamine accumulated in the finished product. When the raw material was spoiled (TVBN content: 120 mg/100 g), the recorded histamine content was twice the limit value (975.1 ± 33.9 ppm).</abstract>

Evaluation of Histamine Contents during the Fish Meal Production Process

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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 78 (2020): Issue 4 (December 2020)

Qualitative-Quantitative Analysis of the „Ciplara“ Purse Seine Catches in the Adriatic Sea

Anthropogenic Impact on Plankton and Benthos Assemblage in the Lagos Lagoon, Nigeria

Genetic Characteristics of Brook Trout Salvelinus fontinalis (Mitchill, 1848) Broodstocks from Hatcheries in Bosnia and Herzegovina

Fast, Not Furious - Adaptation of the Species List and Fish Size Classes for Fish Assemblage Survey Technique (FAST) for the Adriatic Sea

Evaluation of Histamine Contents during the Fish Meal Production Process

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