Assessment of the conservation status of endemic sculpin<i>Cottus haemusi</i>(Cottidae) in the river Vit (Danube Tributary), northwest Bulgaria

Uzunova, E.

doi:10.1051/kmae/2011071

Cited by 1 publication

(2 citation statements)

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“…These speciation events occurred due to glacial periods [8,9]. These range-restricted species have been reported as endangered during the past few years, mostly due to habitat fragmentation [10][11][12][13]. The habitat fragmentation is aggravated by the intense human pressure, with additional threats such as habitat reduction caused by urban and agricultural pollution; water extraction for agriculture and damming; or unnatural flow regimes resulting from flow regulations which meet electrical power demands-often resulting in low water levels, followed by instantaneous high flow regimes [6,10,11,13].…”

Section: Introductionmentioning

confidence: 99%

“…These range-restricted species have been reported as endangered during the past few years, mostly due to habitat fragmentation [10][11][12][13]. The habitat fragmentation is aggravated by the intense human pressure, with additional threats such as habitat reduction caused by urban and agricultural pollution; water extraction for agriculture and damming; or unnatural flow regimes resulting from flow regulations which meet electrical power demands-often resulting in low water levels, followed by instantaneous high flow regimes [6,10,11,13]. This impact has reduced the distribution areas into smaller and isolated populations, which face serious risks such as environmental changes, demographic stochasticity, natural catastrophes and reduced genetic variability.…”

Section: Introductionmentioning

confidence: 99%

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First Captive Breeding Program for the Endangered Pyrenean Sculpin (Cottus hispaniolensis Bacescu-Master, 1964)

Manubens¹,

Comas²,

Valls³

et al. 2020

Water

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The strong decline of freshwater fish species in Europe implies that further ex-situ conservation plans should be implemented in the near future. The present study reflects our experience with the Pyrenean sculpin (Cottus hispaniolensis Bacescu-Mester, 1964)—a small cottid endemic to the Hispano-French Garona River basin. In recent years, the Spanish Pyrenean sculpin population has reached a limit situation. Because of that, the non-profit association ADEFFA—with support from the public administration—started the first captive breeding program for this species in 2006. Fourteen years later, this study presents the results and evaluates the different steps of the program, with the aim of discussing and improving the ex-situ conservation plans for this and other cold freshwater species. There is a description and a comparison between six consecutive phases during the captive breeding process: nesting behaviour, courtship, egg fixation, parental care (incubation), hatching and survival during juvenile development. The purposes of this project are to: (1) identify the most determining phases for a successful captive breeding; (2) identify the factors that had a major influence to the success of the critical phases; and (3) increase the number of the offspring. This study is based on thirty-three wild individuals collected from Garona River (Val d’Aran, Spanish Pyrenees). During the program, twelve couples spawned in captive conditions, with around 2300 eggs laid. Eight couples bred successfully, with 751 hatched individuals and 608 juveniles reared. The analysis of each step of the captive breeding does not reveal significant differences between phases, so it can be concluded that they are all critical at the same level. In the literature, similar study-cases of captive breeding programs identify incubation and survival phases as the most critical. Consequently, the management made for this project has probably allowed to overcome in part the main impediments described in other similar programs.

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