Daily Growth Rates as Indicated by Valve Ridges in Postlarval Giant Scallop (Placopecten magellanicus) (Bivalvia: Pectinidae)

1993 ◽  
Vol 50 (3) ◽  
pp. 456-464 ◽  
Author(s):  
G. Jay Parsons ◽  
Shawn M. C. Robinson ◽  
John C. Roff ◽  
Michael J. Dadswell
Keyword(s):  
Growth Rates ◽  
Larval Fish ◽  
Shell Height ◽  
Age Determination ◽  
Growth Patterns ◽  
Placopecten Magellanicus ◽  
Short Term ◽  
Daily Growth ◽  
Alizarin Red ◽  
Growth Increments

Postlarval giant scallop (Placopecten magellanicus) were examined for daily growth ridges and growth rates by marking the dissoconch shell with Alizarin red dye. The surface of the left valve of postlarvae was composed of concentric ridges, each consisting of a series of irregularly shaped raised nodules. Ridges were clear and distinct in newly settled scallop between ≈0.25 and 2.0 mm shell height. The shell of postlarvae >2 mm was pigmented and ribbed and ridges were no longer distinguishable. Estimated age was significantly correlated with actual age, suggesting that growth ridges were produced daily, under the environmental conditions of Passamaquoddy Bay. Mean growth rate ranged from 32 to 57 μm∙d−1 and was proportional to size and age, but growth of individual scallop showed no coherence in their daily growth patterns. The short-term growth ridges in postlarval giant scallop can be used to determine age and can be applied to comparative growth, mortality, and recruitment studies of newly settled individuals <2.0 mm (≈40 d old postsettlement). The high accuracy and precision of age determination for postlarval scallop differs from studies of short-term internal growth increments of bivalve shells and larval fish otoliths.

In situ growth rate estimates of Southern Ocean krill, Thysanoessa macrura

2019 ◽  
Vol 31 (3) ◽  
pp. 116-122 ◽  
Author(s):  
Jake R. Wallis ◽  
Jessica E. Melvin ◽  
Robert King ◽  
So Kawaguchi
Keyword(s):  
Growth Rate ◽  
Southern Ocean ◽  
Growth Rates ◽  
Somatic Growth ◽  
Growth Patterns ◽  
Daily Growth ◽  
Thysanoessa Macrura ◽  
Growth Method ◽  
Repeated Sampling ◽  
The Antarctic

AbstractGrowth, which is intrinsically linked to environmental conditions including temperature and food availability are highly variable both temporally and spatially. Estimates of growth rates of the Southern Ocean euphausiid Thysanoessa macrura are currently restricted to limited studies which rely upon repeated sampling and length-frequency analysis to quantify growth rates. The instantaneous growth method (IGR) was used to measure the growth rate of T. macrura successfully in the southern Kerulen Plateau region during summer, providing the first IGR parameters for the Southern Ocean euphausiid species. Results of the four-day IGR incubation indicate a period of low somatic growth for adult T. macrura. Males had a longer intermoult period (IMP) (62 days) than females (42 days), but the sexes exhibited similar daily growth rates of 0.011 mm day−1 and 0.012 mm day−1 respectively. Juveniles exhibited the fastest growth, with an IMP of 13 days and daily growth rate of 0.055 mm day−1 indicating a prolonged growth season, similar to the Antarctic krill E. superba. Consequently, we highlight the usability of the IGR method and strongly encourage its use in developing a comprehensive understanding of spatial and seasonal growth patterns of T. macrura.

Influence of biomass and ocean climate on the growth of Pacific herring (Clupea pallasi) from the southwest coast of Vancouver Island

1997 ◽  
Vol 54 (12) ◽  
pp. 2782-2788 ◽  
Author(s):  
R W Tanasichuk
Keyword(s):  
Growth Rates ◽  
Growing Season ◽  
Vancouver Island ◽  
Pacific Herring ◽  
Daily Growth ◽  
Sea Temperature ◽  
Clupea Pallasi ◽  
Southwest Coast ◽  
Growth Increments ◽  
Adult Growth

I examined the growth of Pacific herring (Clupea pallasi) from the southwest coast of Vancouver Island using data for over 83 000 fish seined between 1975 and 1996. Size-at-age (length, total mass) of recruits (age 3) was negatively related to parental biomass. Length was also negatively related to sea temperature over the first growing season and positively related to salinity later in the third growing season. Prerecruit effects explained variations in mass and length for adult herring ages 4 and 5, respectively. Growth of adults was described as growth increments (growth rates). Seasonal growth in length for adults was assumed to be a linear function of time, and growth in mass an exponential function. Daily growth rates for length were negatively related to initial length. Instantaneous daily growth rates in mass were a negative function of initial mass, adult biomass, and sea temperature in August. Interannual variations in condition suggest that adults grow differently in mass than they do in length. I suggest that length is not synonymous with mass as a measure of adult growth. Consequently, it provides little, if any, information on surplus energy accumulation by adults and therefore adult fish contribution to stock productivity.

scholarly journals Age determination in merobenthic octopuses using stylet increment analysis: assessing future challenges using Macroctopus maorum as a model

2011 ◽  
Vol 68 (10) ◽  
pp. 2059-2063 ◽  
Author(s):  
Zoë A. Doubleday ◽  
Jimmy White ◽  
Gretta T. Pecl ◽  
Jayson M. Semmens
Keyword(s):  
Body Weight ◽  
Life History ◽  
Early Life ◽  
Age Determination ◽  
Early Life History ◽  
Daily Growth ◽  
Life History Stages ◽  
Growth Increments ◽  
Increment Formation ◽  
Future Challenges

Abstract Doubleday, Z. A., White, J., Pecl, G. T., and Semmens, J. M. 2011. Age determination in merobenthic octopuses using stylet increment analysis: assessing future challenges using Macroctopus maorum as a model. – ICES Journal of Marine Science, 68: 2059–2063. Stylet increment analysis (SIA) is a method recently developed to age octopuses; it involves the enumeration of daily growth increments within stylets (an internal shell). To examine the potential of SIA in a merobenthic octopus species, SIA was applied to Macroctopus maorum collected from southeast Australia and New Zealand (n = 147). The stylets had clear concentric growth increments and a core-like region. However, low increment counts (≤224 d) produced non-feasibly high (≤21.7% body weight per day) instantaneous growth rates, based on the assumption that increment number relates to age (d). In the light of these results, the issues surrounding the application of SIA to merobenthic octopuses is discussed, particularly in relation to the lack of understanding in regard to stylet development in the early life history stages and the importance of validating age at first increment formation.

Annual growth patterns in the inner shell layer of Mytilus edulis L.

1976 ◽  
Vol 56 (3) ◽  
pp. 723-731 ◽  
Author(s):  
R. A. Lutz
Keyword(s):  
Age Determination ◽  
Growth Patterns ◽  
Shell Morphology ◽  
Fossil Species ◽  
The Past ◽  
Growth Increments ◽  
Surface Shell ◽  
The Subject ◽  
Logical Research

INTRODUCTIONMolluscan age determination has long been the subject of both biological and paleonto-logical research (Mossop, 1922 a, b; Haskin, 1954; Merrill, Posgay & Nichy, 1965; Andrews, 1972). Several workers have listed difficulties associated with traditional methods of determining the age of an organism based upon surface shell morphology (Pannella & MacClintock, 1968; Farrow, 1971, 1972; Berry, 1971). Others, such as Craig & Hallum (1963) have attempted, with moderate success, to circumvent these problems statistically by using size-frequency relationships, but such methods are of little value in age analysis of isolated individuals. The principal difficulty encountered in shell surface analyses arises from an inability to distinguish spawning and disturbance lines from annual marks. Problems associated with this separation have been reduced over the past decade by the discovery of daily and tidal periodicity structures within the shells of numerous Recent and fossil species of pelecypods (Barker, 1964,1970; Pannella & MacClintock, 1968; Clark, 1968; House & Farrow, 1968; Farrow, 1971, 1972). The biological and paleontological significance of such growth increments have been discussed at length by Pannella & MacClintock (1968), Barker (1970), and Clark (1974). When present in continuous sequences, these periodicity structures facilitate an accurate age determination of individual specimens.

scholarly journals Moonlight enhances growth in larval fish

2020 ◽  
Author(s):  
Jeffrey Shima ◽  
SE Swearer
Keyword(s):  
Life History ◽  
Growth Rates ◽  
Larval Fish ◽  
Fish Larvae ◽  
Larval Growth ◽  
Negative Influence ◽  
Life History Strategies ◽  
Foraging Efficiency ◽  
Daily Growth ◽  
Pelagic Larvae

© 2018 by the Ecological Society of America Moonlight mediates trophic interactions and shapes the evolution of life-history strategies for nocturnal organisms. Reproductive cycles and important life-history transitions for many marine organisms coincide with moon phases, but few studies consider the effects of moonlight on pelagic larvae at sea. We evaluated effects of moonlight on growth of pelagic larvae of a temperate reef fish using “master chronologies” of larval growth constructed from age-independent daily increment widths recorded in otoliths of 321 individuals. We found that daily growth rates of fish larvae were enhanced by lunar illumination after controlling for the positive influence of temperature and the negative influence of cloud cover. Collectively, these results indicate that moonlight enhances growth rates of larval fish. This pattern is likely the result of moonlight's combined effects on foraging efficiency and suppression of diel migrations of mesopelagic predators, and has the potential to drive evolution of marine life histories.

scholarly journals Moonlight enhances growth in larval fish

2020 ◽  
Author(s):  
Jeffrey Shima ◽  
SE Swearer
Keyword(s):  
Life History ◽  
Growth Rates ◽  
Larval Fish ◽  
Fish Larvae ◽  
Larval Growth ◽  
Negative Influence ◽  
Life History Strategies ◽  
Foraging Efficiency ◽  
Daily Growth ◽  
Pelagic Larvae

© 2018 by the Ecological Society of America Moonlight mediates trophic interactions and shapes the evolution of life-history strategies for nocturnal organisms. Reproductive cycles and important life-history transitions for many marine organisms coincide with moon phases, but few studies consider the effects of moonlight on pelagic larvae at sea. We evaluated effects of moonlight on growth of pelagic larvae of a temperate reef fish using “master chronologies” of larval growth constructed from age-independent daily increment widths recorded in otoliths of 321 individuals. We found that daily growth rates of fish larvae were enhanced by lunar illumination after controlling for the positive influence of temperature and the negative influence of cloud cover. Collectively, these results indicate that moonlight enhances growth rates of larval fish. This pattern is likely the result of moonlight's combined effects on foraging efficiency and suppression of diel migrations of mesopelagic predators, and has the potential to drive evolution of marine life histories.

Juveniles recruitment and daily growth of the southern stock of Mugil liza (Actinopterygii; Fam. Mugilidae): new evidence for the current life-history model

2017 ◽  
Vol 99 (1) ◽  
pp. 215-221 ◽  
Author(s):  
Damián L. Castellini ◽  
Daniel Brown ◽  
Nicolás A. Lajud ◽  
Juan M. Díaz De Astarloa ◽  
Mariano González-Castro
Keyword(s):  
Life History ◽  
Fishery Management ◽  
Atlantic Coast ◽  
Age Determination ◽  
Calculated Data ◽  
Small Scale ◽  
Daily Growth ◽  
Western Atlantic ◽  
Fishery Resource ◽  
Growth Increments

Mugil liza is distributed along the western Atlantic coast. It is a commercially exploited species in Argentina, supporting a small-scale fishery conducted by an artisanal fleet. Age determination of fishes constitutes an important key issue for fishery management. The age, growth and recruitment of M. liza juveniles in Mar Chiquita coastal lagoon and Las Brusquitas creek (Buenos Aires, Argentina), were estimated by means of the analysis of the sagittal otoliths of fish collected during January to December of 2014. Ages were estimated by counting and measuring daily growth increments in otoliths under a light microscope. A total of 735 specimens ranging from 19 to 71.5 mm SL and from 67 to 212 days age was analysed. Lengths at previous ages were determined by back-calculation, a linear growth model was fitted to the back-calculated data: SL = 0.2468 + 2.0516; R2 = 0.9945. Two peaks of recruiters were observed from February to March, and from October to November in 2014. Mean ages in days of Querimana and juveniles at the recruitment time were 84.07 ± 14.43 days and 87.56 ± 19.51 days, respectively. The hatching dates of specimens showed two spawning seasons. One was from December 2013 to January 2014, and the second one from July to August 2014. The assessment carried on this work generated age determination values that support previous findings, contributing to make a more accurate description of the life-history model currently used. In addition, valuable information has been generated to give better advice for improving the management of the fishery resource.

scholarly journals Age verification of boarfish (Capros aper) in the Northeast Atlantic

2011 ◽  
Vol 69 (1) ◽  
pp. 34-40 ◽  
Author(s):  
Karin Hüssy ◽  
Julie O. Coad ◽  
Edward D. Farrell ◽  
Lotte A. W. Clausen ◽  
Maurice W. Clarke
Keyword(s):  
Stock Assessment ◽  
Age Determination ◽  
Fishing Industry ◽  
Daily Growth ◽  
Northeast Atlantic ◽  
The Past ◽  
Growth Increments ◽  
Recent Interest ◽  
Marginal Increment ◽  
Age Verification

Abstract Hüssy, K., Coad, J. O., Farrell, E. D., Clausen, L. A. W., and Clarke, M. W. 2012. Age verification of boarfish (Capros aper) in the Northeast Atlantic. – ICES Journal of Marine Science, 69: 34–40. The boarfish (Capros aper) is a pelagic species of recent interest to the fishing industry, with landings increasing by >500% over the past 3 years. The objective of the study was to provide a method for age determination based on whole sagittal otoliths, with the results to be used in stock assessment. Translucent zones laid down at regular intervals are identified by marginal increment analysis as seasonally recurring. Translucent zones are formed between September/October and March/April, regardless of fish age. The occurrence of the first annulus is validated by analysis of presumed daily growth increments. Subsequent annulus deposition is homogenous between individuals and allows general guidelines to be derived for interpreting the age of boarfish using their otoliths.

Growth and reproductive rates of Littorina neritoides (L.) in North Wales

1980 ◽  
Vol 60 (3) ◽  
pp. 591-599 ◽  
Author(s):  
Roger N. Hughes ◽  
Derek J. Roberts
Keyword(s):  
Growth Rates ◽  
Egg Production ◽  
Feeding Activity ◽  
Shell Height ◽  
Growth Parameter ◽  
Spawning Season ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Asymptotic Size ◽  
Growth Increments

Growth rates in shell height on the shore and the number of eggs released in the laboratory during the spawning season were extremely variable among Littorina neritoides from a population on Anglesey, N. Wales. Much of this variability was attributed to the effects of unpredictable weather conditions on feeding activity. Thirtyper cent of the individually tagged snails in the population did not grow during 1976–8. Growth increments of the remaining snails were used to estimate the growth parameter, k, of the von Bertalanffy growth equation, and the asymptotic size, h∞, used in the equation was estimated to be 7·5 mm, corresponding to the largest individual found in the population. The von Bertalanffy equation was then used to construct a growth schedule for L. neritoides from post-settlement to the attainment of the asymptotic size. From this schedule, snails were expected to take at least 9 months to grow to a shell height of 2 mm and at least 5 years to grow to 7 mm. This growth schedule agrees closely with growth rates observed by Lysaght (1941) in a population at Plymouth, but predicts much lower growth rates than those estimated by Daguzan (1976) for a population in Brittany. Eggs were released from March to June in 1977 and from January to June in 1978. The extreme individual variability in egg production largely obscured the underlying relationship between fecundity and body size. The maximum observed fecundity was for a 71 mm snail which released a total of 3866 eggs during the 1978 spawning season. The average fecundity was 22 eggs per day during the 1978 spawning season, or about 300 eggs per season.

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