scholarly journals Daily Increments in the Otolith of Repomucenus valenciennei

1998 ◽  
Vol 64 (5) ◽  
pp. 838-839 ◽  
Author(s):  
Kou Ikejima ◽  
Naoki Mizuno ◽  
Hisashi Kurokura ◽  
Makoto Shimizu
Keyword(s):  
Daily Increments ◽  
Repomucenus Valenciennei

Validation of daily increments and a marine-entry check in the otoliths of sockeye salmon Oncorhynchus nerka post-smolts

2015 ◽  
Vol 87 (1) ◽  
pp. 169-178 ◽  
Author(s):  
C. Freshwater ◽  
M. Trudel ◽  
T. D. Beacham ◽  
C.-E. Neville ◽  
S. Tucker ◽  
...  
Keyword(s):  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Daily Increments

scholarly journals A Critical Analysis of Corona Related Data: What the More Reliable Data Can Imply for Western-Europe

2020 ◽  
Vol 10 (10) ◽  
pp. 3398
Author(s):  
Robert J. Meier
Keyword(s):  
Western Europe ◽  
Real Life ◽  
European Countries ◽  
Initial Increase ◽  
Local Concentration ◽  
Related Data ◽  
Daily Increments ◽  
Human Contact ◽  
Exponential Increase ◽  
Real Life Data

We present a less common type of discussion about COVID-19 data, beginning with the observation that the number of people reported deceased following COVID-19 infection is currently the most reliable dataset to be used. When the available real-life data are visualized for a number of European countries, they reveal the commonly seen exponential increase, though with different absolute rates, and over time different periods. More interesting information is obtained upon inspection of the daily increments in deaths. These curves look very similar to those for China, and seem to indicate that in European countries that have imposed more strict human–human contact measures, in particular Italy and Spain, where we have seen a decrease in daily deaths since early April, it is to be expected it will take 40–50 days from the end of March until this number has fallen to negligible levels. Taking the initial increase in the number of deaths for Germany, and combining this with typical values for the mortality reported in the literature and the published number of daily contacts for the working population, we calculated an initial increase in infections of 20 per day by a single infected person with an average human–human contact number of 22, decreasing to 5.5 after the first 10 days. The high number at the outset is likely related to outbreaks in a high local concentration of people.

Coryphopterus kuna, a new goby (Perciformes: Gobiidae: Gobiinae) from the western Caribbean, with the identification of the late larval stage and  an estimate of the pelagic larval duration

Zootaxa ◽  
2007 ◽  
Vol 1526 (1) ◽  
pp. 51-61 ◽  
Author(s):  
BENJAMIN C. VICTOR
Keyword(s):  
Larval Stage ◽  
Gene Sequence ◽  
Pelagic Larval Duration ◽  
Larval Duration ◽  
Sequence Matching ◽  
Daily Increments ◽  
Black Spots ◽  
Fin Ray ◽  
Western Caribbean ◽  
Pelvic Fin

A new goby, Coryphopterus kuna, is described from the Atlantic coasts of Panama and Mexico. The species is distinguished from other Coryphopterus spp. by the low median fin and pectoral fin ray counts and the morphology of the pelvic fin. The pelvic fins are fully joined with a rounded outline and have branched and longer innermost pelvic fin rays. There is no frenum connecting the two pelvic fin spines and the fin is heavily speckled with black spots in the male holotype. The late larval stage of C. kuna is identified by DNA sequence matching and is morphologically similar to other larval Coryphopterus spp. but has a distinct melanophore pattern. Examination of the otolith microstructure reveals a relatively long pelagic larval duration of 63 days with a narrowing of the later daily increments suggesting delayed metamorphosis. The species is the first vertebrate to include gene sequence barcoding under the Barcode of Life Data System (BOLD) in the species description.

Sex ratio in the dragonet,Repomucenus valenciennei

1999 ◽  
Vol 46 (4) ◽  
pp. 426-428 ◽  
Author(s):  
Kou Ikejima ◽  
Makoto Shimizu
Keyword(s):  
Sex Ratio ◽  
Repomucenus Valenciennei

larval growth and mortality of japanese spanish mackerel (scomberomorus niphonius) in the central seto inland sea, japan

2005 ◽  
Vol 85 (5) ◽  
pp. 1255-1261 ◽  
Author(s):  
jun shoji ◽  
tsutomu maehara ◽  
m. tanaka
Keyword(s):  
Fish Larvae ◽  
Larval Mortality ◽  
Larval Growth ◽  
Survival Strategies ◽  
Seto Inland Sea ◽  
Larval Feeding ◽  
Spanish Mackerel ◽  
Daily Increments ◽  
Absolute Growth ◽  
Scomberomorus Niphonius

growth and mortality rates of larval japanese spanish mackerel (scomberomorus niphonius) were estimated by using otolith daily increments in 1997 and 1998 in the sea of hiuchi, central seto inland sea. there was no day–night difference in the abundance and size-distribution of s. niphonius larvae in the 3–10 mm size-classes, indicating the larvae were efficiently collected by the larva-net used for sampling (1.3 m mouth diameter, 0.5 mm mesh). mean absolute growth rate (0.748 mm d−1 in 1997, 0.821 mm d−1 in 1998), weight specific growth coefficient (g: 0.402 in 1997, 0.444 in 1998) and mortality coefficient (m: 0.784 in 1997 and 0.625 in 1998) were among the highest reported for marine fish larvae. scomberomorus niphonius seems to have evolved survival strategies characterized by fast growth with strong piscivory that can reduce duration of the larval period with the high mortality. in 1997, spatial distribution of the larvae was not well corresponded to that of their prey, clupeid larvae, and the larval feeding incidence was lower than in 1998. recruitment potential assessed by examining the ratio of g:m was lower in 1997 (0.513 in 1997, 0.711 in 1998) due to the lower g and higher m values. prey fish availability may be one of the important determinants for the recruitment potential by controlling the larval mortality due to starvation and/or starvation-related predation.

Daily Growth Increments in Otoliths of Starry Flounder (Platichthys stellatus) and the Influence of Some Environmental Variables in Their Production

1982 ◽  
Vol 39 (7) ◽  
pp. 937-942 ◽  
Author(s):  
Steven E. Campana ◽  
John D. Neilson
Keyword(s):  
Environmental Conditions ◽  
Environmental Variables ◽  
Daily Basis ◽  
Otolith Growth ◽  
Daily Growth ◽  
Environmental Regime ◽  
Starry Flounder ◽  
Daily Increments ◽  
Growth Increments ◽  
Platichthys Stellatus

Tetracycline injected into juvenile starry flounders (Platichthys stellatus) was incorporated into the periphery of the sagittal otoliths within 24 h. The resulting band, visible under ultraviolet light, was used as a dated mark on the otolith growth increments. This technique was used to verify that increments were laid down on a daily basis, both in field and laboratory environments. Subdaily increments were visible in otoliths of fishes reared under most environmental conditions. The production of daily increments in juvenile starry flounders preconditioned to a natural environmental regime was unaffected by photoperiod or temperature fluctuation, suggesting the presence of an internal circadian rhythm.Key words: starry flounder, Platichthys stellatus; otoliths, daily rings, growth increments, circadian, tetracycline

Slower Growth Results in Larger Otoliths: An Experimental Test with Guppies (Poecilia reticulata)

1989 ◽  
Vol 46 (1) ◽  
pp. 108-112 ◽  
Author(s):  
David Reznick ◽  
Eric Lindbeck ◽  
Heather Bryga
Keyword(s):  
Growth Rate ◽  
Food Quality ◽  
Experimental Test ◽  
Growth Rates ◽  
Aquatic Environment ◽  
Genetic Background ◽  
Poecilia Reticulata ◽  
Daily Increments ◽  
Otolith Size ◽  
Age Structures

We demonstrate that slowly growing guppies (Poecilia reticulata) have larger otoliths than equal-sized, rapidly growing guppies. This relationship has been suggested by previous authors, but they compared wild or pond-reared fish from different poopulations, thereby confounding their observations with the different environments. Our experiment controlled for the genetic background, food quality, and the aquatic environment and assessed the influences of food availability and growth rate on relative otolith size. This difference in relative otolith dimensions could aid in comparing growth rates among populations or could improve the use of otolith dimensions for estimating population age structures. In both cases, these methods could also complement data based on counting daily increments or annuli on otoliths and other structures to characterize growth rates and age structures.

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