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

The endocrine-disrupting effects of triclosan, an antimicrobial agent, and its involvement in reproductive responses mediated through different modes of activity in various fish species have been documented. The present study aims to explore whether triclosan at environmentally relevant and sublethal concentrations could influence the reproductive physiology of the fish <italic>Anabas testudineus</italic> in the spawning phase. Fish were exposed to triclosan at environmentally relevant (0.009 and 9 µg L−1) and sublethal (176.7 µg L−1) concentrations for 4, 7, 30 and 60 d during the spawning phase for evaluating the reproductive potential of the fish. Triclosan exposure caused a significant (<italic>P</italic>&lt;0.05) reduction in the level of total protein in gonads and liver tissues while increasing blood plasma to meet the energy demand and overcome metabolic stress. Impairment in gonadal steroidogenesis was evidenced by the reduction in the activities of 3β- and 17β-hydroxysteroid dehydrogenases associated with alteration in the levels of serum gonadotropins, sex steroid hormones and vitellogenin. Triclosan exposure caused a reduction in the rate of fecundity in females and declined sperm counts, motility and viability in males. Histological lesions in gonadal tissues further confirmed the reproductive toxicity of triclosan, which in turn could contribute to the reproductive failure of the fish.
</abstract>

Triclosan Influences on Reproductive Physiology of Climbing Perch in the Spawning Phase

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

The study on the reproductive biology of shortfin mako shark is carried out through the commercial catches from artisanal boats active on the Moroccan Central Atlantic coast and landed in Sidi Ifni Port, for the period between October 2017 and August 2019. A total of 1690 individuals were examined, including 846 females and 844 males. As a result, the overall sex ratio of shortfin mako sharks tends towards equilibrium. The monthly sex ratio in shortfin mako sharks shows that males are more abundant compared to females in winter. In autumn and spring, we encounter more females. For the remainder of the year, the sex ratio tends to be balanced, with a slight predominance of males. Three stages of the maturity scale were found. Juvenile males with a rate of 50% were most frequently encountered during the study, followed by subadults with a rate of 32% and adults with a rate of 18%. The size at first sexual maturity of the male shortfin mako shark was estimated to be between 180 cm and 200 cm in total length, corresponding to an estimated age of 6 years.
</abstract>

Chouaib Doukkali University, Faculty of Sciences

Sex Ratio and Male Maturity for Shortfin Mako Shark in the Moroccan Central Atlantic Coast

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

Karimunjawa as a marine national park has attracted tourists to come and explore coral reefs. The reefs are under increasing pressure from the development of underwater tourist activities so it is necessary to pay attention to the reef condition to maintain its sustainability. This study was conducted in September 2019 by examining the condition of coral reefs in the most visited snorkeling spots based on information from tour operators, i.e. the Ujung Bintang, Maer and Karang Sendok spots. Data was collected using a 20 m line belt transect to count coral cover and was analyzed using coral morphology triangles to assess the Coral Condition Index (CCI) and Impact Severity Index (ISI). The condition of coral reef cover at the Ujung Bintang and Maer spots were in the “good” category based on the CCI, while at the Karang Sendok spot the corals were in the “bad” category based on the ISI. The three snorkeling spots have competition-adapted (K) morphology, which means that the coral reefs are dominated by non-Acropora corals associated with coral reefs with high waves. The dominant life form at the Ujung Bintang spot was foliose corals, at the Maer spot, it was foliose coral and non-Acropora branching corals, while at the Karang Sendok it was Acropora, which is more vulnerable than foliose and massive corals. The CCI at the three spots was in the “good” category as there are healthy coral colonies, whereas the ISI was in the “poor” category since partially and recently dead coral colonies were found there. The coral colony damage in the spots was dominated by bleached coral colonies and partially dead coral colonies.
</abstract>

Coral Reef Conditions At the Snorkeling Spots of the Karimunjawa National Park, Indonesia

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

A study of the interannual variability of the size-age composition of <italic>M. barbatus ponticus</italic>, inhabiting the south-western shelf of the Crimea, was carried out over a five-year period (between 2016 and 2020). The influence of habitat temperature on growth rate is considered. Equations obtained characterize the size-weight growth of <italic>M. barbatus ponticus</italic>. The influence of the sea temperature on the development of individuals is considered. It is shown that with an increase in the average annual water temperature, the average annual length (correlation coefficient <italic>r</italic> = 0.97), weight (<italic>r</italic> = 0.96) and condition factor (<italic>r</italic> = 0.93) of individuals increase. It was found that red mullet has a positive allometric growth in the study area. The analysis showed that there was a close correlation between changes in the average annual temperature and the allometric growth rate b (<italic>r</italic> = 0.97). The equations of length growth of <italic>M. barbatus ponticus</italic> showed retarded linear growth of the fish living on the south-western shelf of the Crimea in comparison with other areas, Sinop region (Black Sea) and the Aegean Sea. The comparison of the effect of temperature on the size and weight parameters of <italic>M. barbatus ponticus</italic> living in the south-eastern part of the Black Sea (Sinop region) and the Aegean Sea is carried out; general patterns and differences are noted.
</abstract>

Influence of Abiotic Environmental Factors on the Growth Rate of Red Mullet

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

The aim of this research is to analyse trends of anglers’ total catches of the most important fish species caught by angling in different parts of the Sava River Basin in Croatia (<italic>Cyprinus carpio, Silurus glanis, Esox lucius</italic> and <italic>Sander lucioperca</italic>). In all investigated counties, with the exception of Vukovar-Sirmium, common carp is the dominant fish species, usually present in significantly higher quantities compared to the other three species. Only in Vukovar-Sirmium county, northern pike is the dominant species caught. In most counties there are no dramatic changes in the catches of these four fish species, apart from the usual oscillations. Due to high fishing pressure and possibly inflow of polluted water from the Bosna River, Vukovar-Sirmium county is also particularly characterised by the trend of declining catches of all four species. The significant negative correlation between the average catch and the respective value of the coefficient of variation (CV) was also found for all data.
</abstract>

Trends in Total Anglers’ Catches At the Croatian Section of the Sava River Basin

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Croatian Journal of Fisheries

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