<abstract>
<title style='display:none'>Abstract</title>
The reproductive cycle of the crustacean family Portunidae on the coast of the Pacific is not well known. Therefore, the reproductive cycle and the size at first maturity of brown crab <italic>Callinectes bellicosus</italic> and its relationship with environmental factors in the El Colorado Lagoon, Ahome, Sinaloa has been determined. A total of 360 females were collected from March 2012 to March 2013. The gonads were fixed in 10% formalin, histological cuts were made by the paraffin inclusion method and the hematoxylin and eosin staining technique. The diameter of oocytes was determined by stage. The size at first maturity was estimated by a logistic model. Females showed gametogenic activity during the entire study period. The maturity period was from March to November 2012, with two spawning peaks, in September 2012 and March 2013. Maturity was inversely influenced by temperature (r = -0.4454, P &lt; 0.05) and no influence by salinity was observed (P &gt; 0.05). The diameter of the oocytes showed significant differences between the development stages of the gonad (P = 0.001). The size at first maturity was 11.57 cm of carapace width for females of <italic>C. bellicosus</italic>.
</abstract>

Reproductive Cycle and Size at First Maturity in Females of Brown Crab <italic>Callinectes Bellicosus</italic> (Stimpson 1859) in the Southwestern Gulf of California, Mexico

<abstract>
<title style='display:none'>Abstract</title>
A fish kill is characterised by the death of a large number of fish in a given area within a short period of time. This is an indicator that water quality and ecosystem conditions in general have deteriorated. Remote sensing data from the MODIS instrument on the Aqua and Merra-2 satellites were accessed from 18 to 22 March 2020, a period that spans before and after the fish kill was reported. Analysis of the remote sensing data shows that the fish kill was preceded by strong winds, i.e. major and sustained wind events. The maps of sea surface temperatures prior to the fish kill show that high-temperature water masses flowed from the equator toward the Bonny-Andoni coast. The dates of occurrence of the high-temperature surface water masses and high wind events around the Bonny-Andoni coastal area were consistent with the location and timing of the fish kill, as indicated by community reports. We hypothesise that the low-oxygen, high-temperature surface water masses passing from the equator on the windward side of the coast may have encountered migrating croakers and trapped an entire school of this benthopelagic fish species, causing acute respiratory distress. The results and hypothesis confirm local reports of gasping fish about 2 nautical miles off the Bonny-Andoni coast. This study confirms the relationship between wind patterns, temperature, and fish kills, providing the first empirical account of probable causes. Because fish kills occur episodically and often leave no trace, this report and future analyses of remote sensing data may be the best way to elucidate this event.
</abstract>

First Report of Fishkill Incidence in Bonny-Andoni Coastal Area, Nigeria

<abstract><title style='display:none'>Abstract</title>The distribution data of <italic>Alburnus sava</italic> and <italic>Telestes souffia</italic> has been updated in Croatia in comparison to the previously known data. <italic>Alburnus sava</italic> is much more widespread in the Sava drainage and also occurs in the River Sava near the town of Županja, rivers Drina and Bosna. <italic>Telestes souffia</italic> has a much more restricted range in Croatia than previously believed and is only known from the Bregana, small, right tributary of the River Sava on the Croatian-Slovenian border. Both species are poorly known and threatened.</abstract>

New distribution data for <italic>Alburnus sava</italic> Bogutskaya, Zupančič, Jelić, Diripasko &amp; Naseka, 2017 and <italic>Telestes souffia</italic> (Risso, 1827) in the Western Balkans

<abstract>
<title style='display:none'>Abstract</title>
For aquaculture assessments, the length-weight relationship and condition factor are considered as standard methods for determining fish growth, its health and the potential yield. A year-long study was conducted to calculate length-weight relationships (LWRs) and condition factor (K) for seven fish species, <italic>Schizothorax niger</italic> (Alghad or snowtrout), <italic>S. curvifrons</italic> (Sattar snowtrout), <italic>Cyprinus carpio</italic> (Common carp), <italic>Carassius carassius</italic> (Crucian carp), <italic>Pethia conchonius</italic> (Rosy barb), <italic>Crossocheilus diplochilus</italic> (Kashmir latia) and <italic>Gambusia holbrooki</italic> (Mosquito fish) in Manasbal Lake. The results revealed that four captured fish species (<italic>S. niger, S. curvifrons, C. diplochilus</italic> and <italic>G. holbrooki</italic>) exhibited negative allometric growth, while other fish species (<italic>C. carpio, C. carassius, P. conchonius</italic>) exhibited positive allometric growth. LWR was significant at <italic>P</italic> &lt; 0.01 in all seven fish species, with a coefficient of determination (R2) ranging between 0.73 to 0.96. The K was higher in <italic>C. carpio</italic> than <italic>C. carassius</italic>, <italic>P. conchonius, G. holbrooki, C. diplochilus, S. niger</italic> and <italic>S. curvifrons</italic>. The current study providing the LWRs and condition factor of seven fish species from Manasbal Lake, Kashmir will be helpful for the management of fish species as well as for assessing the ecological condition of the Lake.
</abstract>

Length-Weight Relationship and Condition Factor of Seven Fish Species in Manasbal Lake, Kashmir, India

<abstract><title style='display:none'>Abstract</title> Orsinogobius croaticus is a freshwater fish with a small and limited distribution range in the Adriatic basin in Croatia and Bosnia-Herzegovina, where it inhabits cold karstic rivers and springs. The main threats to its populations include habitat fragmentation, declining habitat quality and the introduction of alien species. Conservation recommendations are proposed to improve effective habitat preservation and to expand the knowledge about this species.</abstract>

Threatened Fishes of the World: Orsinogobius Croaticus (Mrakovčić, Kerovec, Mišetić and Schneider, 1996) (Teleostei: Gobiidae)

<abstract><title style='display:none'>Abstract</title>
Season and water quality are essential indicators in the life cycle of pond ecosystems. The season is a natural factor affecting the level of water quality dynamics in shrimp cultivation in ponds. This study aims to evaluate the dynamics of differences in water quality parameters in intensive <italic>Litopenaeus vannamei</italic> ponds during dry and rainy seasons. This current study applied an <italic>ex post facto</italic> causal design based on actual field conditions. During the rainy season, water quality parameters tended to fluctuate dynamically, with the parameters of phosphate (PO4), nitrite (NO2), and total organic matter (TOM) exceeding the threshold value of water quality standards for aquaculture, with a PO4 value of 0.734 mg/L, a NO2 of 0.180 mg/L, and a TOM of 101.29 mg/L. In the dry season, water quality parameters remained stable, with only the phosphate parameter showing a value above the water quality standard threshold of 0.633 mg/L. Based on the trend of fluctuations in the two seasons, a model of equation Y = 3.979 + 0.814x was made with a significance value &lt;α (0.05), which means that the two seasons positively correlated with the impact on fluctuations of water quality in the ponds. The results of the dynamic modelling analysis showed contradictions in water quality and nutrients during rainy and dry seasons. Water quality parameters in intensive <italic>L. vannamei</italic> cultivation during dry and rainy seasons fluctuated dynamically and differed according to the type of weather conditions and the current season.
</abstract>

Water Quality Fluctuations in Shrimp Ponds During Dry and Rainy Seasons

<abstract>
<title style='display:none'>Abstract</title>
Nile tilapia <italic>Oreochromis niloticus</italic> is one of the most important fishery resources and a valuable fish species for aquaculture programmes. It is found in almost all waters and is widely dispersed. Several natural populations of this species have been impacted by genetic pollution despite their significant economic relevance. Understanding population structure is a crucial first step in protecting this species in its native habitats as well as in choosing which wild stocks to use in hatchery initiatives. To demonstrate the genetic-population structure of this species, genetic differences among three geographically secluded populations of <italic>O. niloticus</italic> were investigated utilizing mitochondrial DNA cytochrome b gene sequences. The results were used to estimate the levels of genetic variability within and among the populations. The 56 cyt b (821 bp) sequences analysis revealed 21 haplotypes, with a nucleotide diversity of 0.0510 and a haplotype diversity of 0.881. In each of the populations, seven (7) singleton variable sites and 19 informative-parsimony sites, genetic diversity could be identified and few population haplotypes were found, indicating a minor genetic distinction between them. For the purpose of conservation and/or Nile tilapia breeding programmes, this information would assist in choosing the fish populations that maintain greater genetic variation in <italic>O. niloticus</italic>.
</abstract>

Genetic Analysis of Three Geographically Secluded Populations of Nile Tilapia <italic>Oreochromis niloticus</italic> (Cichlidae)

<abstract>
<title style='display:none'>Abstract</title>
Carotenoids are naturally occurring pigments in plants, algae, fungi, insects, and crustaceans. Krill and prawns contain high levels of some value-added nutrients for the aquaculture industry, such as astaxanthin which is used as a colouring agent. In birds with ornamental plumage, such as canaries, the carotenoid-pigmented plumage and red hues are exclusively due to the diet. In this regard, our aim was to study the possibilities of using shrimp waste for feather colouring in canary <italic>Serinus canaria domestica</italic>. Shrimp <italic>Pandalus borealis</italic> dried waste was included in the feed of six female red lipochrome mosaic canaries <italic>Serinus canaria domestica</italic> for three months during their third molt. The basic diet consisted of a seed mixture (canary seed, sunflower seed without shell, linseed, and rapeseed), rearing food (Quiko®Bianco), and conditioning food (Quiko®Rusk) with the supplementation of an oil suspension of dried shrimp waste (3%). The <italic>ad libitum</italic>-fed birds had additional free access to pasta (Legazin® Procria White Morbida). To evaluate the effect of shrimp waste on feather colouring, covert feathers were taken from the tail in the region of the uropygial gland. Diffuse reflectance spectroscopy of the most intensely coloured parts of the feathers was measured by a spectrophotometer. The chromaticity coordinates in a CIE xyY colour space were calculated from the measured spectroscopy. The results of the experiment showed that shrimp waste increased chromaticity and had no negative effect on the canaries. On this basis, the authors assumed that dried shrimp waste could be an alternative to synthetic dyes.
</abstract>

Carotenoids from Shrimp Waste as a Natural Dye for the Feather Colouring of Canary Birds <italic>Serinus canaria domestica</italic>

<abstract>
<title style='display:none'>Abstract</title>
Huchen or Danube salmon <italic>Hucho hucho</italic> (Linnaeus 1758) is one of the largest salmonid species in the world and the largest species native to the Danube basin in Europe. In Serbia, this species inhabits the Drina river system, as well as the upper reaches of the River Ibar. It has already been introduced into the rivers Moravica and Đetinja, which are part of the Zapadna Morava catchment area. Most recently, huchen was stocked from its native habitat into the rivers Jerma and Nišava in the Južna Morava river system, and into the River Mlava which flows into the Danube. Huchen is listed as an endangered (EN) species on the IUCN Red List of Threatened Species and is protected in Serbia, and a Conservation Action Plan has already been adopted. In this report, we present the first record of this species in the River Grza, which is a part of the Velika Morava river system, outside its native range. The ichthyofauna of this recipient river consists of brown trout <italic>Salmo trutta</italic> L. and Eurasian minnow <italic>Phoxinus phoxinus</italic> L. In a small river of a fragile ecosystem such as this, the introduction of huchen as an apex predator can seriously harm the species of the native fish community, which warns of the illegal stocking measures currently in process.
</abstract>

First Record of Huchen <italic>hucho hucho</italic> (Linnaeus 1758) in the Grza River: Human-Caused Introduction from its Native Habitat in Serbia

<abstract>
<title style='display:none'>Abstract</title>
A study was conducted on the changes in sea surface temperature (SST) on the southwestern shelf of the Crimea between 2000 and 2020. The equations of trends in the change of SST were found. It is shown that the following three periods can be distinguished according to the nature of changes in the average annual sea temperature: 2000 - 2007, 2008-2013 and 2014 - 2020. The influence of changes in the average annual SST on the development of pelagic fish of the cold-water complex was considered (using the example of the Black Sea sprat). Changes in the main parameters of the populations and their relationship with the change in the average annual SST were determined. It was found that the increase in sea temperature negatively affected the development of the sprat population, and the average age of the population decreased by 1.3 times. In general, the population was rejuvenated, and the average size and weight of individuals decreased.
</abstract>

The Influence of the Temperature Factor on the Changes in the Growth Parameters of Sprat (2000 - 2020)

<abstract>
<title style='display:none'>Abstract</title>
<italic>Litopenaeus vannamei</italic>, a highly adaptable shrimp species known for its growth, thrives in environmental conditions with proper water quality. However, salinity stress poses a significant challenge, compromising shrimp survival and growth. To optimize shrimp feed, the inclusion of alginate and <italic>Spirulina</italic> sp. offers benefits such as enhanced growth and resistance to environmental stress. This research aims to assess the impact of adding <italic>Spirulina</italic> sp., alginate, and their combination on the survival rate, resistance to the salinity shock test, and growth of <italic>L. vannamei</italic>. In this study, a completely randomized design (CRD) method with nine different feed doses was used. The treatments included control, supplementation of Alg 1 (alginate 1 g/kg feed), Alg 3 (alginate 3 g/kg feed), Alg 5 (alginate 5 g/kg feed), Sp 3 (spirulina 3 mg/kg feed), Sp 6 (spirulina 6 mg/kg feed), Sp 9 (spirulina 9 mg/kg feed), AS 1+1 (alginate 1 g/kg feed + spirulina 1 mg/kg feed), AS 2+3 (alginate 2 g/kg feed + spirulina 3 mg/kg feed), and AS 3+5 (alginate 3 g/kg feed + spirulina 5 mg/kg feed). The supplementation of feed was given during the fourteen-day rearing period. The results of the study show that the supplementation of Sp 9 (spirulina 9 mg/kg feed) led to a significant growth (<italic>α</italic> = 0.05). All treatments supplemented with alginate and/or <italic>Spirulina</italic> sp. water extract had a significant effect (<italic>α</italic> = 0.05) on the resistance to the salinity shock test. The different treatments in <italic>L. vannamei</italic> feed supplementation significantly influenced (<italic>α</italic> = 0.05) shrimp survival. Polysaccharides and antioxidant properties in alginate and <italic>Spirulina</italic> sp. have an important role in increasing the growth and resistance to salinity shock of <italic>L. vannamei</italic>.
</abstract>

Benefits of Alginate and Spirulina Supplementation to the Growth and Resistance Against Salinity Exposure in <italic>Litopenaues vannamei</italic> Post-Larvae

<abstract>
<title style='display:none'>Abstract</title>
<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><title style='display:none'>Abstract</title>A checklist of the freshwater fish fauna of Croatia is presented for the first time. It is based on 1360 publications of historical and recent data in the literature. According to the literature review, there were 137 fish species in 30 families and 75 genera recorded in Croatia. The checklist is systematically arranged and provides distributional data of the freshwater fish fauna as well as whether the species is endemic, introduced or translocated.</abstract>

A Review of Extant Croatian Freshwater Fish and Lampreys

<abstract><title style='display:none'>Abstract</title>A global problem of today is the large amount of waste in the seas and oceans, primarily plastic waste. It is estimated that every year 1.25 to 2.41 million tons of plastic material is being carried by rivers into the seas and oceans. Waste is a major problem for marine organisms, causing entanglement, choking, strangulation, malnutrition and death. In 1972 the problems caused by microplastics, particles smaller than 5 mm, were first observed. Such particles bind pathogenic microorganisms on to their surface. Increasing quantities of microplastics have been found in the stomachs of fish, and also in shellfish that feed by filtering sea water. Ingested by marine organisms, such plastics may eventually pass through the food web and can end up ingested by humans. In addition, plastic releases chemical compounds whose effect on marine organisms and humans has still not been studied. Many international and state organizations offer solutions through recycling plastic waste, as well as reducing the production of plastic materials and informing the public about the problem.</abstract>

The Problem of Plastic Waste and Microplastics in the Seas and Oceans: Impact on Marine Organisms

<abstract><title style='display:none'>Abstract</title> We have limited knowledge of determinants of consumer preferences for wild-caught versus farmed-raised fish, so this work aims to investigate the impact of sociodemographics, habits and frequency of fresh fish consumption, such as involvement in cooking, on the preferences for wild versus farmed fish. A survey was done on a sample of 1151 fish consumers in Croatia. Results showed that female, older consumers, consumers with higher income and those living in coastal parts of Croatia give higher preferences for wild fish and they detect differences between the taste of wild and farmed fish. Consumers with higher levels of habits of fresh fish consumption, who eat fresh fish often and are more involved in cooking, prefer wild-caught fish. These findings provide valuable information for the aquaculture sector, especially for planning marketing strategies for the promotion of farmed fish.</abstract>

Wild-Caught Versus Farmed Fish – Consumer Perception

<abstract><title style='display:none'>Abstract</title>The objective of the present study was to examine the length-weight relationships and condition factors of snapper <italic>Lutjanus russellii</italic>, ponyfish <italic>Aurigequula fasciata</italic> and white-spotted spinefoot <italic>Siganus canaliculatus</italic> harvested from Ulelhee Bay, Banda Aceh City, Indonesia. These species are the predominant fishes caught by traditional beach trawl in Ulelhee Bay, Banda Aceh City, Indonesia. The sampling was conducted for three months from April to June 2015 at one-week interval. A total of 900 fish samples (300 individuals for each species) were measured for the total length and body weight. The length-weight relationships were calculated using Linear Allometric Model (LAM), while the relative weights (Wr) and Fulton’s condition (K) factors were calculated to assess the condition of the fish samples. The results showed that the <italic>b</italic> value of 3.04 in snapper indicates isometric growth pattern, while ponyfish and white-spotted spinefoot fish had the b values of 1.41 and 1.75, respectively, and these species display an allometric growth pattern. The average Fulton’s condition factor (K) of snapper was 3.01 for male and 2.49 for female; female ponyfish has the K value of 2.92 and 2.92 for male. In addition, the average K value of whitespotted spinefoot was 2.61 and 2.59 for female and male, respectively. The relative weight condition factor ranges from 58.73 to 166.09 for snapper, from 70.55 to 129.65 for ponyfish, and from 71.63 to 133.53 for white-spotted spinefoot. In general, the relative weight condition factors tendedto be 100. It is concluded that snapper has isometric growth pattern, while ponyfish and white-spotted spinefoot display the negative allometric growth pattern. The condition factors are in excellent condition and indicate a balance of prey and predator.</abstract>

Length-Weight Relationships and Condition Factors of the Three Dominant Species of Marine Fishes Caught by Traditional Beach Trawl in Ulelhee Bay, Banda Aceh City, Indonesia

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Croatian Journal of Fisheries

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 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...

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 The Croatian Journal of Fisheries was established in 1938 and today possesses a long-term tradition of publishing papers that deal...

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