Some biological characteristics, habitat requirements and implications for conservation of endemic freshwater fish Capoeta aydinensis (Turan, Küçük, Kaya, Güçlü & Bektaş, 2017) in Tersakan stream (Muğla)

Aspects of the biology of the Australian Grayling Prototroctes maraena Günther (Pisces : Prototroctidae)

Marine and Freshwater Research ◽

10.1071/mf9780743 ◽

1978 ◽

Vol 29 (6) ◽

pp. 743 ◽

Cited By ~ 9

Author(s):

KA Bishop ◽

JD Bell

Keyword(s):

Freshwater Fish ◽

Frequency Distribution ◽

Fish Species ◽

Spawning Season ◽

Habitat Requirements ◽

Length Frequency Distribution ◽

Length Frequency ◽

Freshwater Fish Species ◽

Australian Grayling ◽

Effective Conservation

The Australian grayling, P. maraena, is generally regarded as Australia's most endangered freshwater fish species. A sample of 312 specimens from the Shoalhaven River, N.S.W., provided data on various aspects of its biology. The sample showed a bimodal length frequency distribution of 1 + and 2+ fish aged by otoliths. Grayling appear to suffer severe mortality, possibly as a result of spawning at age 2. The spawning season in the Shoalhaven River was from early February to early March and available data suggest that grayling are anadromous. P. maraena is a microphagic omnivore, and stomachs sampled contained principally cladocerans, algae and small insects. The need for further research to elucidate the grayling's habitat requirements and to determine effective conservation measures is stressed.

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Habitat Preferences of Italian Freshwater Fish: A Systematic Review of Data Availability for Applications of the MesoHABSIM Model

Frontiers in Environmental Science ◽

10.3389/fenvs.2021.634737 ◽

2021 ◽

Vol 9 ◽

Author(s):

Giovanni Negro ◽

Stefano Fenoglio ◽

Emanuele Quaranta ◽

Claudio Comoglio ◽

Isabella Garzia ◽

...

Keyword(s):

Systematic Review ◽

Freshwater Fish ◽

Fish Species ◽

Grey Literature ◽

Habitat Preferences ◽

Data Availability ◽

Regulated River ◽

Habitat Requirements ◽

Physical Habitat ◽

Freshwater Fish Species

The MesoHABitat SImulation Model (MesoHABSIM) is the preferred method to calculate spatio-temporal variation in the fish habitat availability in Italian rivers. With the aim of improving the applicability of the MesoHABSIM approach in the Italian territory, we carried out a systematic review of physical habitat preferences for 31 freshwater fish species and three freshwater lampreys, representing 75% of the total indigenous freshwater fish community of Italy. Information related to suitable ranges of depth, flow velocity, biotic/abiotic substrates, covers/shelters was collected and summarized for two critical life stages (adult and juvenile) and two bioperiods (rearing/growth and spawning). Overall, 250 publications were reviewed, classified as 206 peer-reviewed papers, 20 books, 7 PhD thesis, and 17 grey literature sources. Our analysis revealed substantial deficits of information about habitat requirements for more than 30% of Italian freshwater fish species. This information is particularly scarce for the most threatened endemic species, especially for their most critical bioperiod (i.e., spawning). With the aim of preserving freshwater fish biodiversity as required in the EU Biodiversity Strategy for 2030 (European Commission, 2020), accurate information on physical habitat requirements for spawning is crucial. As an example application of MesoHABSIM, the collected habitat preference information was used to define and apply mesohabitat suitability criteria for one fish species (Telestes muticellus) in a regulated river reach of Argentina Creek (Province of Imperia, Italy). This analysis demonstrates the potential for applying information from the current review to other fish species.

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