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.

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.

Daily growth rates and hatch date distributions of common two-banded seabream, Diplodus vulgaris inhabiting the Çanakkale shallow waters of Turkey

2014 ◽  
Vol 95 (1) ◽  
pp. 185-191 ◽  
Author(s):  
Hakan Ayyildiz ◽  
Ozcan Ozen ◽  
Aytac Altin
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Somatic Growth ◽  
Analysis Of Covariance ◽  
Shallow Waters ◽  
Daily Growth ◽  
Data Set ◽  
Sea Temperature ◽  
Growth Equations ◽  
Otolith Microstructure Analysis

Otolith microstructure analysis was used to determine daily age, growth rate and hatching periods of young of the year (YOY) common two-banded seabream, Diplodus vulgaris, collected at two sites by using beach seine from Çanakkale shallow waters between January and December 2007. Total length of the YOY D. vulgaris was between 12 and 86 mm and the daily ages ranged between 42 and 313 days. Somatic growth rate estimated by fitting a linear regression to the age–length data set was calculated as 0.273 mm day−1. According to the length–age regression analysis, maximum daily growth rates were found 0.277 mm day−1 in the lowest sea temperature period and minimum values of 0.274 mm day−1 were observed in the declining sea temperature period. Analysis of covariance indicated that there were no significant differences in the linear growth equations for the two cohorts (F = 0.4008, P = 0.527). Hatching period of the YOY was estimated to occur between October and March with relatively higher frequency in January. This study has shown that YOY D. vulgaris is a winter spawner in the Çanakkale shallow waters.

Growth of Macrocystis integrifolia in Barkley Sound, Vancouver Island, B.C.

1978 ◽  
Vol 56 (21) ◽  
pp. 2707-2711 ◽  
Author(s):  
Christopher S. Lobban
Keyword(s):  
Growth Rates ◽  
Southern California ◽  
Growing Season ◽  
Vancouver Island ◽  
Barkley Sound ◽  
Stipe Elongation ◽  
Macrocystis Integrifolia ◽  
Summer Maximum

Stipe elongation rates were measured over an 18-month period which included one normal summer and one in which there was unusually heavy epiphytism and defoliation. Calculated standard growth rates (G) followed atypical boreal pattern, rising in February through April, with a summer maximum of ca. 40 mm/day, and falling in October and November. This contrasts with M. pyrifera in southern California, which has G ca. 70 mm/day throughout the year. The maximum number of fronds that could be produced in the growing season by a frond series of M. integrifolia is about 20, but the number actually produced is 8; many frond initials are lost through grazing or abrasion or may be suppressed by high frond densities.

Simulated and observed response of the southwest Vancouver Island pelagic ecosystem to oceanic conditions in the 1990s

1999 ◽  
Vol 56 (12) ◽  
pp. 2433-2443 ◽  
Author(s):  
Clifford KL Robinson ◽  
Daniel M Ware
Keyword(s):  
Empirical Data ◽  
Coastal Upwelling ◽  
Condition Factor ◽  
Model Performance ◽  
Ecosystem Model ◽  
Vancouver Island ◽  
Pacific Herring ◽  
Pelagic Ecosystem ◽  
Clupea Pallasi ◽  
The Pacific

In this paper, we discuss changes in the ocean climate around La Perouse Bank off southwestern Vancouver Island, British Columbia, and its influence on the functioning of the pelagic ecosystem. We compare results of a one-dimensional simulation model of plankton and fish production and biomass dynamics with empirical data collected in the 1990s. Comparisons of simulation results with empirical data indicate that the La Perouse model can account for relative interannual changes in copepod biomass, euphausiid biomass and production, the consumption of Pacific herring (Clupea pallasi) by Pacific hake (Merluccius productus), and the growth condition factor of Pacific hake. The model is less successful at capturing changes in spring diatom biomass, the proportion of euphausiids in the Pacific hake diet, and interannual variability in the Pacific herring condition factor. A measure of overall model performance suggests that the La Perouse ecosystem model performs equally well in both strong and weak upwelling periods. The La Perouse ecosystem model has been used to generate an annual index of net phytoplankton and macrozooplankton production for the coastal upwelling region off southwestern Vancouver Island from 1967 to 1998.

Density, growth, and change in density of coho salmon and rainbow trout in three Lake Michigan tributaries

1983 ◽  
Vol 61 (5) ◽  
pp. 1120-1127 ◽  
Author(s):  
L. M. Carl
Keyword(s):  
Rainbow Trout ◽  
Growth Rates ◽  
Lake Michigan ◽  
Coho Salmon ◽  
Daily Growth ◽  
Salmon Fry ◽  
Daily Change ◽  
Early Fall ◽  
Growth And Change ◽  
Downstream Movement

Coho salmon spawning peaked in the late fall. Spawning densities ranged from fewer than 5 coho salmon per hectare up to 90 fish per hectare. Subyearling coho salmon densities ranged from 10 to 60 fish per 100 m2 in June and dropped to 5–20 fish by early fall. Coho salmon fry increased in length from 40 mm in early May, to over 120 mm by smolt out-migration in the following April. Coho salmon instantaneous daily change in density coefficients ranged from 0.004 to 0.019 and were dependent on initial coho density. Daily coho salmon growth rates ranged from 0.38 to 0.60 mm per day and were not dependent on initial coho salmon density. Downstream movement of rainbow trout fry began in May, and continued into July. In the spring 10–20 yearlings and one to five 2-year-olds per 100 m2 were present. Most fry emerged in June at a size of 25 mm and grew to 85 mm by fall. Daily growth rates varied from 0.23 to 0.45 mm per day for yearling rainbow trout and were not correlated with rainbow trout density.

Spread of oil from theTenyo Maru, off the Southwest coast of Vancouver Island

1993 ◽  
Vol 8 (1) ◽  
pp. 75-91 ◽  
Author(s):  
S. Venkatesh ◽  
William R. Crawford
Keyword(s):  
Vancouver Island ◽  
Southwest Coast

Reassessment of Maximum Growth Rates for C3 and C4 Crops

1978 ◽  
Vol 14 (1) ◽  
pp. 1-5 ◽  
Author(s):  
J. L. Monteith
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Growing Season ◽  
Maximum Growth ◽  
Maximum Growth Rate ◽  
Crop Growth ◽  
Close Inspection ◽  
Similar Difference ◽  
Photosynthetic Efficiencies

SUMMARYFigures for maximum crop growth rates, reviewed by Gifford (1974), suggest that the productivity of C3 and C4 species is almost indistinguishable. However, close inspection of these figures at source and correspondence with several authors revealed a number of errors. When all unreliable figures were discarded, the maximum growth rate for C3 stands fell in the range 34–39 g m−2 d−1 compared with 50–54 g m−2 d−1 for C4 stands. Maximum growth rates averaged over the whole growing season showed a similar difference: 13 g m−2 d−1 for C3 and 22 g m−2 d−1 for C4. These figures correspond to photosynthetic efficiencies of approximately 1·4 and 2·0%.

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