Genetic Diversity and Population Genetic Structure of Korean Black Scraper Thamnaconus modestus in Korea and Japan Based on the mtDNA Marker

Gwak, Woo-Seok; Roy, Animesh

doi:10.1007/s12601-021-00017-z

Cited by 4 publications

(2 citation statements)

References 55 publications

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“…Lipase activity was detected throughout the early developmental stages in our study, and similar results were found for California halibut (Alvarez-Gonzaĺez et al, 2005) and common dentex, Dentex dentex (Gisbert et al, 2009). Furthermore, it was previously reported that lipase was actively found in 4 dph T. modestus larvae (Gwak and Lee, 2009). However, lipase activity was detected until 13 dph in the Mayan cichlid, Cichlasoma urophthalmus (Loṕez-Ramıŕez et al, 2011) and until 20 dph in turbot (Cousin et al, 1987).…”

Section: Changes In Activities Of the Main Digestive Enzymes Of T Mod...supporting

confidence: 90%

Changes in growth, morphology, and levels of digestive enzymes and growth-related hormones in early ontogeny of black scraper, Thamnaconus modestus

Liu,

Zeng,

Zhang

et al. 2024

Front. Mar. Sci.

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IntroductionThe black scraper, Thamnaconus modestus, is a highly valued marine fish species, but its output has gradually decreased in recent years, which may be due to its low survival rate during early ontogenesis.MethodsTherefore, in this study, we assessed the changes in growth, morphology, digestive enzymes, and hormone levels in T. modestus from 0–60 days post-hatching (dph) and revealed growth turning points by morphological measurement and determination of digestive enzyme activities and hormone levels. We found that ontogenesis could be divided into the larval (0–20 dph) and juvenile (20–60 dph) stages. Acid and alkaline protease activity significantly increased and decreased, respectively, from 12–25 dph, likely due to the development of stomach and gastric glands. Acid phosphatase levels significantly increased at 0 and 4 dph, which may be related to the regulation of metabolism and immune protection. A sharp increase in alkaline phosphatase levels at 20 and 25 dph was observed and was likely due to the development of the brush border membrane of enterocytes. The amylase level was significantly higher at 25, 30, and 35 dph, possibly due to better digestion and absorption during the transition from consuming Artemia to compound feed. In newly hatched larvae, the level of thyroid hormones triiodothyronine (T3) and thyroxine (T4) gradually increased and peaked at 35 dph, highlighting the importance of these hormones during the development of T. modestus. Growth hormone (GH) levels first increased from 0–8 dph, with a plateau at 8–20 dph, and then increased at 25–30–35 dph. For insulin-like growth factor 1 (IGF-1), a significant increase with a subsequent plateau was observed between 8 and 20 dph, followed by a substantial decrease between 30 and 35 dph. These results suggest that the regulating functions of GH and IGF-1 are synchronised. Digestive enzyme activity and hormone levels of abnormal fry at 30 dph were lower than those of normal fish, highlighting the importance of specific hormones, especially T4 and IGF-1, in the development of T. modestus.

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Section: Changes In Activities Of the Main Digestive Enzymes Of T Mod...supporting

confidence: 90%

Changes in growth, morphology, and levels of digestive enzymes and growth-related hormones in early ontogeny of black scraper, Thamnaconus modestus

Liu,

Zeng,

Zhang

et al. 2024

Front. Mar. Sci.

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“…Nonetheless, all molecular markers are routinely used in population genetics analysis (Wei et al, 2013;Silva & Gardner, 2015;Gwak & Roy, 2021;Saha et al, 2021;Gardner et al, 2022;Zheng et al, 2022;Yamazaki et al, 2022) with some categories (e.g., microsatellites and mtDNA) being more appropriate than others for specific purposes (Tsykun et al, 2017;Hauser et al, 2021;Alam & Pálsson, 2021; Walton et al, 2022).…”

Section: Single Nucleotide Polymorphisms (Snps)mentioning

confidence: 99%

Population genetic and genomic approaches for the management of the blackfoot paua, Haliotis iris Gmelin 1791, within the genus context

Trauzzi

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The blackfoot pāua, Haliotis iris Gmelin 1791 is one of three endemic species of abalone (Haliotis spp.) found in New Zealand. This marine gastropod is a taonga (highly prized or treasured) species and a traditional kai moana (seafood) in the Māori culture. The increase in commercial interest around the exploitation of pāua shells and meat in the early 1960s led to the development of fishing restrictions and in 1986/87 and to the pāua fishery management system based on quota management areas (QMAs). In 2016, the Kaikōura earthquake generated a coastal uplift along the Kaikōura region where one of the country’s most productive pāua fisheries is located. Pronounced mortality of seaweed and marine intertidal invertebrates was reported in the affected region. Subsequently, the pāua fishery along approximately 110 km of coastline and encompassing two QMAs (PAU3A and PAU7) was closed for 5 years with substantial losses in annual revenue. It was reopened for 3 months on the 1st December 2021. The fishery was closed again at the end of February 2022 and at the time of writing remains closed. The goals of this thesis are to: 1) identify patterns of global population genetic structure and genetic connectivity within the genus Haliotis by reviewing the published literature to provide context to the findings obtained for the blackfoot pāua from New Zealand; 2) describe the population genetic connectivity, genetic diversity and population genetic structure of pāua populations from the Kaikōura region before and after the 2016 earthquake for the first time through genotyping-by-sequencing (GBS)-derived molecular markers (single nucleotide polymorphisms - SNPs); 3) investigate potential genotypic-environmental associations (GEAs) between the variation at microsatellite markers and environmental variation for pāua populations at the national scale; and 4) identify significant GEAs between neutral genetic variation at SNP loci for pāua at Kaikōura and environmental (i.e., ecological and oceanographic data) data before and after the 2016 earthquake. Abalone are widely understudied and the literature is strongly biased towards certain species of economic relevance in developed countries where most biological stocks do not correspond to fishing management units. Abalone species worldwide are generally characterised by weak population genetic structure that can be explained by the geomorphology of the coasts (i.e., headlands, bays) and correlated physical oceanography (i.e., ocean currents and upwelling). For the blackfoot pāua from Kaikōura, weak genetic structure (differentiation from other sites) was found at Cape Campbell, a headland, the northernmost site in the region and a well-known biogeographic boundary in New Zealand. High levels of gene flow and the large effective population sizes (Ne) of all populations in the Kaikōura region may have counterbalanced the effects of the Kaikōura earthquake on this species. Based on the current dataset, no direct effect of the 2016 earthquake was evident for the pāua populations from Kaikōura. Differences in the genetic connectivity patterns between adults and juveniles in PAU3A were detected. This finding could be explained by different scenarios including but not limited to local recruitment, variability in ocean currents and/or cohort effect. Collection of long-term genomic data may further clarify the stability of this pattern and its possible causes. Seascape genetics revealed the association between the genetic differentiation of pāua at Cape Campbell with higher sedimentation levels and higher sea surface temperatures (SST) that may act as barriers to gene flow for pāua to other (regional) sites. Chlorophyll-a and SST were also associated with patterns of genetic connectivity in juveniles in PAU3A and loosely followed a geographic pattern. Multiple estimates of SST, proxies for ocean currents, oceanic fronts and productivity levels of the waters around New Zealand, were significantly associated with variation at microsatellite loci for pāua at the national scale. This research reports the successful development of high throughput genomic data and its applications to pāua management in New Zealand at regional scales and the use of novel genetic analyses to pāua at the national scale. The overlap between the genetic split detected for pāua at Cape Campbell and the original boundary between the two QMAs (based on the boundary between iwi tribes) denoted how the QMS in New Zealand took into consideration Māori stewardship over marine resources since its beginning. The detection of a genetic break at small spatial scales supports the ongoing shift towards a finer scale fishery management in New Zealand and suggests the implementation of advanced genomic tools to inform management decisions. Seascape genetics analyses carried out in this thesis highlighted a relationship between genetic and environmental variations for pāua at both small and large spatial scales that could inform restoration efforts as well as focus on stocks at potential risk. Increased levels of sedimentation and high SST were recorded in the Marlborough region where pāua stocks are declining. Attention to pāua stocks in areas where these two environmental factors are increasing is suggested especially considering climate global change. The integration of genomic tools into fishery management represents the next big advancement in the long-term sustainable exploitation of pāua stocks in New Zealand.

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Conservation genomics of an endangered floodplain dragonfly, Sympetrum pedemontanum elatum (Selys), in Japan

Higashikawa,

Yoshimura,

Nagano

et al. 2023

Conserv Genet

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Genetic Diversity and Population Genetic Structure of Korean Black Scraper Thamnaconus modestus in Korea and Japan Based on the mtDNA Marker

Cited by 4 publications

References 55 publications

Changes in growth, morphology, and levels of digestive enzymes and growth-related hormones in early ontogeny of black scraper, Thamnaconus modestus

Changes in growth, morphology, and levels of digestive enzymes and growth-related hormones in early ontogeny of black scraper, Thamnaconus modestus

Population genetic and genomic approaches for the management of the blackfoot paua, Haliotis iris Gmelin 1791, within the genus context

Conservation genomics of an endangered floodplain dragonfly, Sympetrum pedemontanum elatum (Selys), in Japan

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