Ontogenetic dynamics of mercury accumulation in Northwest Atlantic sea lamprey (Petromyzon marinus)

2006 ◽  
Vol 63 (5) ◽  
pp. 1058-1066 ◽  
Author(s):  
Paul E Drevnick ◽  
Martin J Horgan ◽  
James T Oris ◽  
Boyd E Kynard
Keyword(s):  
Petromyzon Marinus ◽  
Sea Lamprey ◽  
High Variability ◽  
Mercury Accumulation ◽  
Maternal Transfer ◽  
Life Stages ◽  
Connecticut River ◽  
High Mercury ◽  
Wet Weight ◽  
Isotope Analyses

We examined the ontogenetic dynamics of mercury accumulation in sea lamprey (Petromyzon marinus) from the Connecticut River, USA. Mercury concentrations in eggs (mean 84 ng·g–1 wet weight) were lowest of all life stages and correlated to concentrations in females. There was a higher rate of maternal transfer of mercury to eggs compared with teleosts. Ammocoetes had high mercury concentrations for their trophic level (e.g., mean of age-4 ammocoetes 492 ng·g–1 wet weight). A further investigation of four streams showed that ammocoetes reflected the level of contamination in their nursery streams. Concentrations of mercury decreased during metamorphosis from ammocoete to adult. Mercury concentrations in adults ranged from 83 to 942 ng·g–1 wet weight and, unlike teleosts, showed no relation to sex, length, or weight. We provide evidence from stable isotope analyses that this high variability is due to feeding ecology. There are fundamental differences in mercury accumulation between sea lamprey and teleosts.

Mercury accumulation in sea lamprey (Petromyzon marinus) from Lake Huron

2014 ◽  
Vol 470-471 ◽  
pp. 1313-1319 ◽  
Author(s):  
Charles P. Madenjian ◽  
Nicholas S. Johnson ◽  
Michael J. Siefkes ◽  
John M. Dettmers ◽  
Joel D. Blum ◽  
...  
Keyword(s):  
Petromyzon Marinus ◽  
Sea Lamprey ◽  
Lake Huron ◽  
Mercury Accumulation

scholarly journals Gut Microbiota Associated With Different Sea Lamprey (Petromyzon marinus) Life Stages

2021 ◽  
Vol 12 ◽  
Author(s):  
Prince P. Mathai ◽  
Muruleedhara N. Byappanahalli ◽  
Nicholas S. Johnson ◽  
Michael J. Sadowsky
Keyword(s):  
Gut Microbiota ◽  
Bacterial Communities ◽  
Petromyzon Marinus ◽  
Adult Life ◽  
Alpha Diversity ◽  
Sea Lamprey ◽  
Life History Stage ◽  
Significant Shift ◽  
Life Stages ◽  
Adult Lamprey

Sea lamprey (SL; Petromyzon marinus), one of the oldest living vertebrates, have a complex metamorphic life cycle. Following hatching, SL transition into a microphagous, sediment burrowing larval stage, and after 2–10+ years, the larvae undergo a dramatic metamorphosis, transforming into parasitic juveniles that feed on blood and bodily fluids of fishes; adult lamprey cease feeding, spawn, and die. Since gut microbiota are critical for the overall health of all animals, we examined the microbiota associated with SLs in each life history stage. We show that there were significant differences in the gut bacterial communities associated with the larval, parasitic juvenile, and adult life stages. The transition from larval to the parasitic juvenile stage was marked with a significant shift in bacterial community structure and reduction in alpha diversity. The most abundant SL-associated phyla were Proteobacteria, Fusobacteria, Bacteroidetes, Verrucomicrobia, Actinobacteria, and Firmicutes, with their relative abundances varying among the stages. Moreover, while larval SL were enriched with unclassified Fusobacteriaceae, unclassified Verrucomicrobiales and Cetobacterium, members of the genera with fastidious nutritional requirements, such as Streptococcus, Haemophilus, Cutibacterium, Veillonella, and Massilia, were three to four orders of magnitude greater in juveniles than in larvae. In contrast, adult SLs were enriched with Aeromonas, Iodobacter, Shewanella, and Flavobacterium. Collectively, our findings show that bacterial communities in the SL gut are dramatically different among its life stages. Understanding how these communities change over time within and among SL life stages may shed more light on the role that these gut microbes play in host growth and fitness.

Origin of iron in sea lamprey, Petromyzon marinus, tissues during embryogenesis and early larval life

1996 ◽  
Vol 74 (12) ◽  
pp. 2206-2210 ◽  
Author(s):  
Kelly K. Tsioros ◽  
John A. Holmes ◽  
John H. Youson
Keyword(s):  
Petromyzon Marinus ◽  
Sea Lamprey ◽  
Maternal Transfer ◽  
Larval Life ◽  
Exogenous Feeding ◽  
Sea Lampreys ◽  
Fe Uptake ◽  
Rapid Accumulation ◽  
Influence Of Substrate

Iron (Fe) concentration was measured in unfertilized eggs, embryos, prolarvae, and young larvae (up to day 56) of sea lampreys (Petromyzon marinus) raised in two substrates to determine (i) the importance of maternal transfer to Fe accumulation in sea lampreys and (ii) the influence of substrate on Fe uptake in young larvae. Unfertilized eggs contained about 35 ng of Fe, supporting the maternal transfer hypothesis. There were no significant changes in Fe concentration in developing embryos and prolarvae after hatching. Young larvae rapidly accumulated Fe from their burrowing substrate and the amount accumulated depended on the amount of Fe in the substrate. Since this rapid accumulation coincides with the beginning of exogenous feeding, as well as burrowing, environmental sources of Fe appear to be important contributors to Fe body burdens in larval sea lampreys.

scholarly journals Rh glycoprotein immunoreactivity in the skin and its role in extrabranchial ammonia excretion by the sea lamprey (Petromyzon marinus) in fresh water

2017 ◽  
Vol 95 (2) ◽  
pp. 95-105 ◽  
Author(s):  
S.D. Blair ◽  
M.P. Wilkie ◽  
S.L. Edwards
Keyword(s):  
Larval Stage ◽  
Life Stage ◽  
Petromyzon Marinus ◽  
Ammonia Excretion ◽  
Aquatic Organisms ◽  
Sea Lamprey ◽  
Life Stages ◽  
Relative Importance ◽  
Sea Lampreys ◽  
Protein Rich

Aquatic organisms employ various strategies to excrete ammonia across the gills, skin, and (or) renal routes. During three different stages of their life cycle, we hypothesized that the basal vertebrate sea lamprey (Petromyzon marinus L., 1758) used the skin as a route for ammonia excretion. Measurements of ammonia excretion using divided flux chambers revealed that extrabranchial sites (skin plus renal) of ammonia excretion were quantitatively more important in larval sea lampreys, but following metamorphosis, the gills became the dominant route of excretion in juvenile sea lampreys. Despite the greater relative importance of the skin in the larval stage, Rh glycoprotein isoforms Rhbg, Rhcg1, and Rhcg2 were detected in the skin in all three sea lamprey life stages examined, but the patterns of expression were dependent on the life stage. We conclude that, during the relatively sedentary filter-feeding larval stage, extrabranchial routes play an equally important role as the gill in facilitating ammonia excretion. However, the gills by virtue of their extensive branchial vasculature become the dominant route of ammonia excretion following metamorphosis because of the need to offload greater amounts of ammonia arising from higher rates of basal ammonia production and the potential to excrete higher amounts of ammonia following ingestion of protein-rich blood in the parasitic stage.

scholarly journals Migratory behavior of adult sea lamprey and cumulative passage performance through four fishways

2017 ◽  
Vol 74 (5) ◽  
pp. 790-800 ◽  
Author(s):  
Theodore Castro-Santos ◽  
Xiaotao Shi ◽  
Alex Haro
Keyword(s):  
Migration Rate ◽  
Cox Regression ◽  
Petromyzon Marinus ◽  
Sea Lamprey ◽  
Native Range ◽  
Slow Movement ◽  
Apparent Effect ◽  
Connecticut River ◽  
Flow Temperature ◽  
Repeated Passage

This article describes a study of PIT-tagged sea lamprey (Petromyzon marinus) ascending four fishways comprising three designs at two dams on the Connecticut River, USA. Migration between dams was rapid (median migration rate = 23 km·day−1). Movement through the fishways was much slower, however (median = 0.02–0.33 km·day−1). Overall delay at dams was substantial (median = 13.6–14.6 days); many fish failed to pass (percent passage ranged from 29% to 55%, depending on fishway), and repeated passage attempts compounded delay for both passers and failers. Cox regression revealed that fishway entry rates were influenced by flow, temperature, and diel cycle, with most lampreys entering at night and at elevated flows, but with no apparent effect of sex or length. Overall delay was influenced by slow movement through the fishways, but repeated failures were the primary factor determining delay. These data suggest that although some lamprey were able to pass fishways, they did so with difficulty, and delays incurred as they attempted to pass may act to limit their distribution within their native range.

scholarly journals Corrigendum: Gut Microbiota Associated With Different Sea Lamprey (Petromyzon marinus) Life Stages

2021 ◽  
Vol 12 ◽  
Author(s):  
Prince P. Mathai ◽  
Muruleedhara N. Byappanahalli ◽  
Nicholas S. Johnson ◽  
Michael J. Sadowsky
Keyword(s):  
Gut Microbiota ◽  
Petromyzon Marinus ◽  
Sea Lamprey ◽  
Life Stages

Classification of Sea Lamprey (Petromyzon marinus) Attack Marks on Great Lakes Lake Trout (Salvelinus namaycush)

1980 ◽  
Vol 37 (11) ◽  
pp. 1989-2006 ◽  
Author(s):  
Everett Louis King Jr.
Keyword(s):  
Great Lakes ◽  
Lake Trout ◽  
Petromyzon Marinus ◽  
Attachment Site ◽  
Sea Lamprey ◽  
Salvelinus Namaycush ◽  
Oral Disc ◽  
Field Assessment ◽  
Sea Lampreys

Criteria for the classification of marks inflicted by sea lamprey (Petromyzon marinus) into nine categories were developed from laboratory studies in an attempt to refine the classification system used in field assessment work. These criteria were based on characteristics of the attachment site that could be identified under field conditions by unaided visual means and by touching the attachment site. Healing of these marks was somewhat variable and was influenced by the size of lamprey, duration of attachment, severity of the wound at lamprey detachment, season and water temperature, and by other less obvious factors. Even under laboratory conditions staging of some wounds was difficult, especially at low water temperatures. If these criteria are to be used effectively and with precision in the field, close examination of individual fish may be required. If the feeding and density of specific year-classes of sea lampreys are to be accurately assessed on an annual basis, close attention to the wound size (as it reflects the size of the lamprey's oral disc) and character of wounds on fish will be required as well as consideration of the season of the year in which they are observed.Key words: sea lamprey, attack marks, lake trout, Great Lakes

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