Winter Survival and Growth of Chondrus crispus in Onshore Culture Tanks

1986 ◽  
Vol 43 (2) ◽  
pp. 263-268 ◽  
Author(s):  
Peter F. Shacklock ◽  
James S. Craigie
Keyword(s):  
Environmental Conditions ◽  
Stocking Density ◽  
Ice Cover ◽  
Winter Survival ◽  
Chondrus Crispus ◽  
Eastern Canada ◽  
Net Production ◽  
Survival And Growth ◽  
Reliable Methods ◽  
Natural Irradiance

Commercial aquaculture of Chondrus crispus in eastern Canada required the development of reliable methods for ensuring the winter survival of a healthy, vegetative inoculum. Two procedures were investigated. Agitated cultures of C. crispus (stocking density <6 kg∙m−2) in running seawater grew at average rates of 0.21–0.34 kg∙m−2∙wk−1 during two winters under natural irradiance. Cultures maintained in undisturbed, outdoor tanks of seawater over three winters showed little or no net production; however, survival was excellent provided that the stocking density remained below approximately 10 kg∙m−2. The plants were capable of resuming growth when environmental conditions improved. We found no difference in the responses of the several haploid and diploid isolates examined. Large vegetative inocula required for commercial aquaculture can be maintained simply and reliably in tanks of clean seawater if they are undisturbed and an ice cover is allowed to form.

The Influence of Stocking Density On Survival and Growth of Buenos Aires Tetra (Hemigrammus Caudovittatus) Larvae Reared Under Controlled Conditions

2008 ◽  
Vol 23 (4) ◽  
pp. 881-887 ◽  
Author(s):  
Krzysztof Kupren ◽  
Dariusz Kucharczyk ◽  
Maja Prusińska ◽  
Sławomir Krejszeff ◽  
Katarzyna Targońska ◽  
...  
Keyword(s):  
Buenos Aires ◽  
Stocking Density ◽  
Controlled Conditions ◽  
Survival And Growth

Interactive effects of family and stocking density on survival and growth of the sea urchin Strongylocentrotus intermedius

2019 ◽  
Vol 50 (5) ◽  
pp. 969-982
Author(s):  
Weijie Zhang ◽  
Xiaohui Chen ◽  
Huijie Jiang ◽  
Zhong Wang ◽  
Baofeng Wang ◽  
...  
Keyword(s):  
Sea Urchin ◽  
Stocking Density ◽  
Interactive Effects ◽  
Strongylocentrotus Intermedius ◽  
Survival And Growth

The ecology of terricolous lichens of the Northern Conifer – Hardwood forests of central Eastern Canada

1968 ◽  
Vol 46 (8) ◽  
pp. 1043-1078 ◽  
Author(s):  
J. D. H. Lambert ◽  
P. F. Maycock
Keyword(s):  
Environmental Conditions ◽  
Ground Level ◽  
Hardwood Forests ◽  
Deciduous Tree ◽  
Eastern Canada ◽  
Central Canada ◽  
Terricolous Lichens ◽  
Moisture Conditions ◽  
Tree Composition ◽  
Lichen Growth

A quantitative analysis of the terricolous (ground) lichens in the Northern Conifer – Hardwood forests of central Canada is presented. Seventy-one forest stands were sampled to determine the composition of the tree and lichen strata. Tree composition was expressed in terms of a series of importance values determined from measures of frequency, density, and dominance on a relative basis, with the importance values for all trees in a stand totalling 300. A statistical analysis of lichen distribution showed that while lichens reacted in a similar manner to moisture conditions as the trees they were more commonly found in stands on dry sites. An ordination of stands indicated that optimum environmental conditions for lichen growth were found in dry young conifer stands of low absolute dominance with fairly open canopies, with slowly decomposing ground litter of decidedly acidic reaction.The increase of deciduous tree species in the mesic segments of the moisture gradient produced environmental conditions unsuitable for most of the lichen species recorded. The reduced occurrence of lichens in such sites was interpreted as being related to the lack of suitable substrates, reduction in light intensity at ground level, increased litter, and a more rapid turnover of organic matter.

scholarly journals Density-dependent Growth of Endangered Labeo bata (Hamilton, 1822) in Nursery Ponds

2016 ◽  
Vol 9 (1) ◽  
pp. 67-73
Author(s):  
MA Samad ◽  
MM Rasid ◽  
MR Haque ◽  
AK Paul ◽  
H Ferdaushy
Keyword(s):  
Survival Rate ◽  
Growth Performance ◽  
Stocking Density ◽  
Ammonia Nitrogen ◽  
Average Weight ◽  
Mean Values ◽  
Labeo Bata ◽  
Survival And Growth ◽  
The Mean ◽  
Dependent Growth

The effect of stocking density on growth performance and survival rate of endangered Labeo bata, was conducted in nursery ponds from 14th June to 13th August, 2013. Three different stocking densities viz. 500, 600 and 700 piece-1 decimal were assigned as treatment T1, T2 and T3, respectively. The initial average weight of L. bata was 0.15±008 g. Hatchlings in all the nursery ponds were fed indigenous feed (26.95% crude protein) for 8 weeks. Temperature, ammonia nitrogen, pH had no significant differences (P<0.05). Final weight (g) was found to be the highest (4.06±0.06) in T1 and the lowest (3.20±0.03) in T3. The mean values of weight gain (g) was the highest (3.91±0.06) in T1 and the lowest (3.05±0.03) in T3. SGR was highest (5.49±0.02) in T1 and lowest (5.09±0.02) in T3. Yet again, survival rate was highest (70.33±0.88) in T1 where stocking density was the lowest among those aforementioned three treatments and lowest (61.00±0.58) in T3 where the stocking density was the highest among the treatments. And finally production (kg-1ha) was found highest (352.66±4.42) in T1 and lowest (337.50±3.19) in T3. Rearing of the Labeo bata fry in those three different stocking densities showed significant (p<0.05) variation both in highest survival and growth performance. Overall production of L. bata in treatment T1 was significantly higher than that of the other two treatments T2 and T3. Despite of this, consistently higher CBR was found from treatments T1 (1:1.78) than from treatment T2 (1:1.25) and T3 (1:1.06).J. Environ. Sci. & Natural Resources, 9(1): 67-73 2016

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