Unusual records of marine organisms in the Neretva River (Croatia and Bosnia and Herzegovina)

Tutman, Pero; Vekić, Josip; Bukvić, Višnja; Glamuzina, Luka; Dulčić, Jakov; Dragičević, Branko

doi:10.32582/aa.62.2.2

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…The intensity of injection depends on the tides, wind action and, most importantly, on the current in the river, which is mainly gen- 2012). As a result of the strong influence of saltwater in the Neretva, migrations of some marine cephalopods and fish have therefore been recorded (GLAMUZINA & DOBROSLAVIĆ, 2020;TUTMAN et al, 2021).…”

Section: Study Areamentioning

confidence: 99%

Ingression of the hydromedusa Neotima lucullana (delle chiaje, 1822) into the ecosystem of the Neretva river estuary (south-eastern Adriatic, Croatia

Garić

Hure

Njire

et al. 2022

Acta Adriat. (Online)

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Hydromedusa Neotima lucullana is an endemic species of the Mediterranean Sea. In this study we document the first numerous and permanent occurrence of N. lucullana in the estuary of the Neretva River, an unusual habitat for this typical marine species. We provide COI barcode sequence of this species, which is also first genetic sequence ever published of N. lucullana. Weekly data on the occurrence and abundance of N. lucullana were obtained from reports and records of autonomous divers and local fishermen in the area from Opuzen to Metković from mid-June to the end of October 2021. The individuals were always located in the layer above the bottom with salinity between 35.2 and 38.2. The diameters of the jellyfish bells ranged from 15 mm to 72 mm, most of them between 40 mm and 58 mm. Differential development of the gonads was observed in all specimens larger than 25 mm. In mid-June, the specimens were common but solitary. A week later, the jellyfish were more frequent and in smaller aggregations. From late June to mid-September, the jellyfish were constantly observed in larger aggregations. Toward the autumn, the number of individuals gradually decreased, and by the last week of October, only single individuals were observed. Our results indicate significant changes in the ecosystem of the Neretva estuary and confirm the observed composition of zooplankton communities dominated by marine species in summer and autumn.

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Section: Study Areamentioning

confidence: 99%

Ingression of the hydromedusa Neotima lucullana (delle chiaje, 1822) into the ecosystem of the Neretva river estuary (south-eastern Adriatic, Croatia

Garić

Hure

Njire

et al. 2022

Acta Adriat. (Online)

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“…Similar recent examples of unusual crosssystem estuarine movements exist. The combined eff ects of drought prevalence and reduced freshwater discharge due to climate change have periodically increased the salinity in river deltas, and consequently, the movements of marine organisms into these historically more freshwater environments [18]. The Neretva River system is the most signifi cant and largest habitat by watershed area of this species and in months preceding specimen capture, the area has been subject to heavy rain conditions that have raised the river level (Glamuzina, pers.…”

Section: Resultsmentioning

confidence: 99%

Unusual fi ndings of soft mouth trout Salmo obtusirostris (Actinopteri: Salmonidae) in the marine environment along the middle Eastern Adriatic coast as a consequence of extreme weather events

Tutman¹,

Kennedy²,

Matić‐Skoko³

et al. 2023

Naše more

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The discovery of individuals of softmouth trout Salmo obtusirostris in the marine environment has been recorded several times in the period from 2015 to the present day in the wider area of the Neretva River delta and southern Adriatic coast. Although this phenomenon appears to be happening more frequently along the Adriatic coast, scientific reports regarding family Salmonidae species found in the marine environment are still very rare in the eastern Adriatic, especially for the softmouth trout. The findings reported here represent the first marine records of this endemic freshwater species. An increasing frequency of these findings may indicate that a higher number of individuals are ending up in the coastal environment during heavy storm events or other unusual hydrologic occurrence. Extreme weather conditions have become more frequent in recent years, mainly as a result of climate change and have led to unexpected phenomena and impacts on nature. The long-term effects on fish and community structure of rivers flowing into the sea require further research, as these weather-induced situations can be expected to become more common. Further investigation into the physiological costs and population consequences of these unusual ecological findings is warranted.

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The ichthyofauna of the upper Neretva River

Neuburg,

Friedrich,

Haring

et al. 2023

Nat Slov

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Fish were sampled at nine locations of the upper Neretva River, upstream of Glavatičevo. Evidence of the endangered softmouth trout (Salmo obtusirostris) was obtained as well as the presence of other native and non-native salmonids. Genetic analysis suggests that the native brown trout (Salmo trutta) in the upper Neretva is homogeneous with no significant introgression by introduced Atlantic-lineage brown trout and quantitative catch data show that their populations are healthy with densities above 1,000 ind/ha. However, the relatively low biomass estimates may be the result of overharvesting. A new haplotype of the mitochondrial control region of the bullhead (Cottus gobio) was detected and confirmation of native S. trutta, Barbatula barbatula, Phoxinus sp., and C. gobio in the upper reaches, underlining the importance of this river stretch. The planned expansion of hydropower plants in the upper Neretva and its tributaries will have a significant negative impact on the largely untouched ichthyofauna, as is clearly demonstrated by the conditions found in the middle course of the river, which has been dedicated to hydropower production.

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Unusual records of marine organisms in the Neretva River (Croatia and Bosnia and Herzegovina)

Cited by 3 publications

References 6 publications

Ingression of the hydromedusa Neotima lucullana (delle chiaje, 1822) into the ecosystem of the Neretva river estuary (south-eastern Adriatic, Croatia

Ingression of the hydromedusa Neotima lucullana (delle chiaje, 1822) into the ecosystem of the Neretva river estuary (south-eastern Adriatic, Croatia

Unusual fi ndings of soft mouth trout Salmo obtusirostris (Actinopteri: Salmonidae) in the marine environment along the middle Eastern Adriatic coast as a consequence of extreme weather events

The ichthyofauna of the upper Neretva River

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