First report of a cystic malformation on the upper jaw of hatchery‐reared allis shad <i>Alosa alosa</i>

Wünnemann, Hannah; Bergmann, Sven; Eskens, U.; Scharbert, Andreas; Hundt, Matthias; Lierz, Michael

doi:10.1111/jfd.12488

Cited by 2 publications

(1 citation statement)

References 41 publications

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“…Yung 1901;Antipa 1909;Gudger 1929), which suggests that the pressure from the eyeball on the cartilage during early ontogeny may mechanically stabilize the head formation. Some species may also develop similar deformities associated with cyst formation on the upper jaw during post-hatch development (Wünnemann et al 2017).…”

Section: Environmental Causationmentioning

confidence: 99%

Pugheadedness in Fishes

Näslund

Jawad

2021

Reviews in Fisheries Science & Aquaculture

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This review summarizes the current state of knowledge of pugheadedness in fish. Records in the scientific literature range from detailed descriptions to brief notes and mere remarks. In total, at least 164 species from 60 families were identified to exhibit pugheadedness, with records published over a span of 465 years (1555 − 2020). The main osteological feature behind pugheadedness appears to be shortening or deformation of the parasphenoid bone, which leads to additional deformations of the ethmovomer-and frontal region. Several other deformations and abnormalities of other cranial bones, eyes, and tongue are occasionally observed, depending on the severity of the pugheadedness. Possible cases in elasmobranchs are also encountered, although the developmental causation may differ from actinopterygians, since their crania have a different organization. Natural cases of pugheadedness are found world-wide, covering a wide range of environments and lifestyles (freshwater-, brackish-and marine environments; benthic, neritic and pelagic species). Cases are found in all life-stages, from embryo to mature adults, suggesting that it does not necessarily lead to early-life mortality. There is some evidence for natural selection acting against pugheaded individuals, likely because of e.g. inappropriately functioning mouth parts, sense organs, and possibly brain deformation. High numbers of pugheads are mainly found in aquaculture, but moderate numbers have been found at some localities also in the wild. Abnormally high occurrence in the wild is commonly attributed to pollution, non-normal water chemistry parameters, or temperature. The causation, however, it typically speculated upon. Based on the reviewed literature, there is support for several causative factors, including genetic mutation and embryonic environmental conditions (toxic and non-toxic) affecting development. Pugheadedness, as the term has been used in the literature, is not a single well-defined pathology, but rather a suite of pathological conditions with similar phenotypic expression.

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Section: Environmental Causationmentioning

confidence: 99%

Pugheadedness in Fishes

Näslund

Jawad

2021

Reviews in Fisheries Science & Aquaculture

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Human health risks of metalloids and metals in muscle tissue of silver carp Hypophthalmichthys molitrix (Valenciennes, 1844) from Lake Flag Boshielo, South Africa

Sara

Marr

Chabalala

et al. 2018

African Journal of Aquatic Science

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The Olifants River, a major tributary of the Limpopo River, is one of the most polluted rivers in South Africa. Consequently, concerns regarding the human health impact of long-term consumption of fish from the Olifants River have been raised in recent studies. Nevertheless, Lake Flag Boshielo situated on the main stem of the Olifants River has been proposed as a site for an inland fishery. Planktivorous silver carp Hypophthalmichthys molitrix (Valenciennes, 1844) is among the potential target species for such a fishery. Therefore, a desk-top human health risk assessment was conducted for silver carp from Lake Flag Boshielo. From January to November 2013, muscle samples from 50 specimens were collected and analysed for metals and metalloids. The hazard quotient based on a weekly meal of 150 g exceeded the acceptable level for As, Cd, Cr, Co, Pb, Hg, Se, V and Zn. Compared with previous studies from Lake Flag Boshielo, muscle tissue concentrations of As, Cr, Pb, Hg, Se, V and Zn for H. molitrix were higher. Based on the metal and metalloid concentrations reported in this study, long-term consumption of silver carp from Lake Flag Boshielo might pose a health risk to impoverished rural communities.

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First report of a cystic malformation on the upper jaw of hatchery‐reared allis shad Alosa alosa

Cited by 2 publications

References 41 publications

Pugheadedness in Fishes

Pugheadedness in Fishes

Human health risks of metalloids and metals in muscle tissue of silver carp Hypophthalmichthys molitrix (Valenciennes, 1844) from Lake Flag Boshielo, South Africa

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