On the trail of detecting genetic (co)variation between resistance to parasite infections (Diplectanum aequans and Lernanthropus kroyeri) and growth in European seabass (Dicentrarchus labrax)

Papapetrou, Maria; Kazlari, Zoi; Papanna, Kantham; Papaharisis, Leonidas; Oikonomou, Stavroula; Manousaki, Tereza; Loukovitis, Dimitrios; Kottaras, Lefteris; Dimitroglou, Arkadios; Gourzioti, Evgenia; Pagonis, Charalampos; Kostandis, Andreas; Tsigenopoulos, Costas S.; Chatziplis, Dimitrios

doi:10.1016/j.aqrep.2021.100767

Cited by 2 publications

(2 citation statements)

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“…Such approaches have successfully been developed and implemented for ectoparasites in multiple finfish genetic improvement programs (Gharbi et al 2015;Houston 2017;Taylor et al 2016), in numerous cases revealing significant additive genetic variation in susceptibility to ectoparasites, and-as might be expected, given the multitude of traits, species, challenge systems, and environments encompassed by such studies-highly variable estimates of genetic correlations with harvest weight (e.g. Bassini et al 2019;Gjerde et al 2011;Lhorente et al 2012;Papapetrou et al 2021;Yáñez et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program

et al. 2022

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In 2017, the base population of a family-based silver carp (Hypophthalmichthys molitrix) genetic improvement program was spawned in Bangladesh. This program aims to improve the growth rate of silver carp under polyculture production systems, through direct selection on the primary trait of harvest-age weight. The objective of this study was to quantify genetic variation in, and genetic correlations between, harvest-age weight (assessed on 8012 fish from 184 families) and a set of secondary traits (assessed on 1603 fish from 175 families). Secondary traits examined included feeding and digestive system traits (i.e. gill raker sponginess and gut length as a ratio of standard length), a morphometric trait (i.e. extent of overlap of pectoral and pelvic fins) and health traits (i.e. presence of Lernaea and prevalence of red spots — sites of inflammation/haemorrhaging). Despite not being under direct selection, genetic change in secondary traits is possible across generations in closed genetic improvement populations as a result of a correlated response to selection for the primary trait (i.e. indirect selection), adaptation to culture conditions, inbreeding and/or genetic drift. It was found that the additive genetic variance within genetic groups was significantly different from zero for all but the studied health traits. Heritability estimates for harvest-age weight and pectoral/pelvic fin overlap were moderate (0.24 and 0.22, respectively) but were low for gill raker score and relative gut length (0.12 and 0.09, respectively). Genetic correlations between harvest-age weight and secondary traits were not significantly different from zero, indicating that selection for harvest-age weight will not result in a correlated response to selection in the studied secondary traits.

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Section: Discussionmentioning

confidence: 99%

Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program

et al. 2022

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“…Formalin and H 2 O 2 appear to have limited efficacy against copepods and isopods affecting Mediterranean species so in this case, alternative bath treatments (Table 7) or supporting oral treatments have been suggested (Table 4). For the particular case of C. oestroides , manual removal during grading or vaccination has been an efficient management process, while in the case of European seabass infected by L. kroyeri , genetic improvement for disease resistance traits has shown promise, 237 in addition to dietary EMB which seems an effective anti‐lice therapy. Additional control strategies used in other farmed species, like light traps and chemotropic disruption equipment could target sea lice in cage culture, 238 while skirts or surface nets may prevent contact between swimming stages and farmed fish 86 .…”

Section: Recommendations On Treatment Strategies Targeting Important ...mentioning

confidence: 99%

Antiparasitic approaches and strategies in European aquaculture, with emphasis on Mediterranean marine finfish farming: Present scenarios and future visions

Rigos,

Padrós,

Golomazou

et al. 2023

Reviews in Aquaculture

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Parasitic infections can be occasionally severe in the European marine aquaculture industry, including the Mediterranean region, as they can incur considerable financial losses. Due to the lack of commercial vaccines, therapeutic approaches seem the only measure to battle parasitic outbreaks. Integrated strategies and increased resilience of the hosts, may limit to some degree the level of infestation. Ectoparasitic therapy is traditionally based on baths, with few exceptions. Several antiparasitic compounds have been registered in European aquatic medicine to combat mainly salmon sea lice; however, few of them are readily used against Mediterranean fish parasites. Formalin and less commonly hydrogen peroxide baths are applied against ectoparasites in the Mediterranean region. Most of the registered anti‐lice antiparasitics have limited potential perhaps due to their adverse environmental impact. Future therapies against fish parasites will rely mainly on effective substances ensuring consumer, animal, and environmental welfare. Ideally, dietary antiparasitics such as praziquantel exhibiting mild environmental impact and high efficacy against a wide range of pathogens should be adopted. Moreover, combined strategies such as integrated pest management, involving various management practices with limited use of chemicals, should be a priority for specific parasitic outbreaks. The information presented in this review can guide future research and promote effective and prudent parasite control practices for Mediterranean‐farmed fish.

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On the trail of detecting genetic (co)variation between resistance to parasite infections (Diplectanum aequans and Lernanthropus kroyeri) and growth in European seabass (Dicentrarchus labrax)

Cited by 2 publications

References 42 publications

Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program

Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program

Antiparasitic approaches and strategies in European aquaculture, with emphasis on Mediterranean marine finfish farming: Present scenarios and future visions

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