Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Recovery of Haemal Lordosis in European Sea Bass Dicentrarchus labrax (Linnaeus 1758)

Version 1 : Received: 18 November 2021 / Approved: 19 November 2021 / Online: 19 November 2021 (12:43:54 CET)

How to cite: Fragkoulis, S.; Kourkouta, C.; Geladakis, G.; Printzi, A.; Glaropoulos, A.; Koumoundouros, G. Recovery of Haemal Lordosis in European Sea Bass Dicentrarchus labrax (Linnaeus 1758). Preprints 2021, 2021110352 (doi: 10.20944/preprints202111.0352.v1). Fragkoulis, S.; Kourkouta, C.; Geladakis, G.; Printzi, A.; Glaropoulos, A.; Koumoundouros, G. Recovery of Haemal Lordosis in European Sea Bass Dicentrarchus labrax (Linnaeus 1758). Preprints 2021, 2021110352 (doi: 10.20944/preprints202111.0352.v1).

Abstract

The lordosis of the haemal part of the vertebral column is a frequent abnormality in reared fish. Haemal lordosis develops during the late larval and early juvenile period, mainly due to the high swimming activity of the fish in the rearing tanks. In the present study we examined whether haemal lordosis recovers during the growth of European sea bass. Furthermore, we aimed to develop simple morphometric indices (PrAn1 and PrAn2) that could link the severity of lordosis at the juvenile stage with fish morphological quality at harvesting. At 111 days post-hatching (dph, 53±4 mm standard length, SL), 600 seabass juveniles with lordotic (L, 200 fish) or normal (N, 400 fish) external morphology were selected and introduced in a common tank. At 150 dph (75±7 mm SL), 350 fish were randomly selected, pit-tagged and transferred in a sea cage for on-growing up to 502 dph (234±16 mm SL). The morphological examination of the fish at 150 and 502 dph revealed that the 60% (46 out of 77) of L juveniles turned into normal phenotype by the end of on-growing period. Interestingly, 56% of the fish with recovered external morphology (N-Rec) presented either a completely normal vertebral column (31%) or minor abnormalities of individual vertebrae (25%). Following the results of geometric morphometric analysis, the differences in the body shape between N-Rec and N fish were not significant (p>0.05, canonical variate analysis). The examined morphometric indices were effective in discriminating the normal fish from the 58% (PrAn1) to 65% (PrAn2) of lordotic juveniles. Results are discussed with respect to the mechanism of lordosis recovery, as well as to their application for the quality control and cull out of the abnormal fish in the commercial hatcheries.

Keywords

skeletal abnormalities; vertebral column; quality index; body shape; finfish aquaculture

Subject

BIOLOGY, Animal Sciences & Zoology

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.