scholarly journals Growth rate, condition, and shell shape of Mytilus galloprovincialis: responses to wave exposure

2003 ◽  
Vol 246 ◽  
pp. 197-209 ◽  
Author(s):  
CN Steffani ◽  
GM Branch
Keyword(s):  
Growth Rate ◽  
Mytilus Galloprovincialis ◽  
Wave Exposure ◽  
Shell Shape ◽  
Rate Condition

Small spatial scale effects of wave action exposure on morphological traits of the limpet Lottia subrugosa

2019 ◽  
Vol 99 (06) ◽  
pp. 1309-1315
Author(s):  
Edson A. Vieira ◽  
Marília Bueno
Keyword(s):  
Spatial Scale ◽  
Scale Effects ◽  
Spatial Scales ◽  
Wave Exposure ◽  
Wave Action ◽  
Shell Shape ◽  
Small Scale ◽  
Small Spatial Scale ◽  
Large Spatial Scale ◽  
Exposed Shore

AbstractMany studies have already assessed how wave action may affect morphology of intertidal species among sites that vary in wave exposure, but few attempted to look to this issue in smaller scales. Using the most common limpet of the Brazilian coast, Lottia subrugosa, and assuming position on rocky boulders as a proxy for wave action at small scale, we tested the hypothesis that waves may also influence limpet morphology at a smaller spatial scale by investigating how individual size, foot area and shell shape vary between sheltered and exposed boulder sides on three shores in the coast of Ubatuba, Brazil. Limpets consistently showed a proportionally larger foot on exposed boulder sides for all shores, indicating that stronger attachment is an important mechanism to deal with wave action dislodgement at a smaller scale. Shell shape also varied in the scale investigated here, with more conical (dissipative) shells occurring in exposed boulder sides in one exposed shore across time and in the other exposed shore in one year. Shell shape did not vary regarding boulder sides across time in the most sheltered shore. Although we did not assess large spatial scale effects of wave action in this study, variations of the effect of waves at small spatial scale observed for shell shape suggest that it may be modulated by the local wave exposure regime. Our work highlights the importance of wave action at small spatial scales, and may help to understand the ecological variability of limpets inhabiting rocky shores.

scholarly journals Effect of Different Routes of Vaccination against Aeromonas salmonicida on Rearing Indicators and Survival after an Experimental Challenge of Pikeperch (Sander lucioperca) in Controlled Rearing

Vaccines ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 476
Author(s):  
Patrycja Schulz ◽  
Elżbieta Terech-Majewska ◽  
Andrzej Krzysztof Siwicki ◽  
Barbara Kazuń ◽  
Krystyna Demska-Zakęś ◽  
...  
Keyword(s):  
Growth Rate ◽  
Experimental Infection ◽  
Challenge Test ◽  
Aeromonas Salmonicida ◽  
Feed Conversion ◽  
Daily Growth ◽  
Rate Condition ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems ◽  
Controlled Rearing

Bacterial diseases are a significant problem in the controlled rearing of fish. Furunculosis (Aeromonas sp.), flavobacteriosis (Flavobacterium sp.), and pseudomonadosis (Pseudomonas sp.) are currently the most frequently identified diseases in recirculating aquaculture systems of various fish species. Such a situation is also observed in pikeperch rearing. Due to the emerging difficulties of effective prophylaxis using commercial vaccines, interest in the use of autovaccinations is increasing, not only in ichthyopathology but also in other veterinary fields. Our research aimed to assess the effect of the vaccination method on the overall condition of the fish and survival after the experimental infection with Aeromonas salmonicida. Pikeperch were vaccinated by (1) bath, (2) a single i.p. injection, or (3) feed. The fish were measured and weighed on day 0 and after 28 and 56 days of the experiment. Specific growth rate, daily growth rate, condition factor, and feed conversion ratio were calculated. On days 7, 14, 21, and 28 of the experiment, ceruloplasmin and lysozyme levels were rated. In addition, a challenge test was performed. The obtained results showed that the method of vaccination is important and affects the growth of fish, the overall condition of fish, and survival after experimental infection.

Growth Rate, Condition and Survival of Red Grouse Lagopus lagopus scoticus Chicks

1993 ◽  
Vol 24 (4) ◽  
pp. 303 ◽  
Author(s):  
R. Moss ◽  
A. Watson ◽  
R. A. Parr ◽  
I. B. Trenholm ◽  
M. Marquiss
Keyword(s):  
Growth Rate ◽  
Red Grouse ◽  
Rate Condition ◽  
Lagopus Lagopus ◽  
Lagopus Lagopus Scoticus

scholarly journals Intra-Specific Variability in Whorl Growth-Rate among Land Gastropods with Conispirally-Coiled Shells

2021 ◽  
pp. 59-69
Author(s):  
Jean Béguinot
Keyword(s):  
Growth Rate ◽  
Statistical Significance ◽  
Repeated Measurements ◽  
Species Level ◽  
Shell Shape ◽  
Snail Species ◽  
Strong Positive Correlation ◽  
Shell Size ◽  
Strong Negative Correlation ◽  
Species Specific

For most conispirally-coiled Gastropods with determinate growth, the geometry of spirally-winding whorls is usually constrained by a strong negative correlation between whorl growth rate and the number of whorls reached at adulthood, as originally reported by the late S.J. Gould. Yet, beyond the tight control of shell-shape at the species level – resulting from this constraint – what about the amplitude of the intra-specific variability of whorl growth-rate, partly contributing to the variability of the overall shell-size at the species level? I address the issue by designing and implementing a new, indirect method for routinely evaluating whorl growth-rate, thereby aiming at considerably saving measurement time, and making it possible to easily achieve repeated measurements across samples large enough to reach statistical significance. This approach was applied to a series of eight common land snail species. The amplitude of intra-specific variability in whorl growth, evaluated this way, proves: (i) being markedly different among the eight investigated species (by a factor that can exceed 2x); (ii) being, yet, high enough, in all cases, to require compensating variations in the adult number of whorls, so as to limit the resulting consequences on the amplitude of the intra-specific variability of adult shell-size. Despite those marked differences in the amplitudes of intra-specific variability of whorl growth-rate among species, no significant relationship was observed between intraspecific variability of whorl growth rate and species-specific shell-shape types (discoidal/globular/elongate) and only weak positive relationship was observed with species-specific typical shell sizes. However, a rather strong positive correlation was found, as expected, between the degree of intra-specific variability of the whorl growth-rate and the degree of intra-specific variability of the number of whorls reached at adulthood (with the yet unexplained exception of one among the eight investigated species).

scholarly journals Feeding and growth coupling during different development larvae phases of the Mediterranean mussel Mytilus galloprovincialis L. from Amsa Bay

2021 ◽  
Vol 298 ◽  
pp. 03007
Author(s):  
Mohamed Ali El Moussaoui ◽  
Yassine Ouagajjou ◽  
Adil Aghzar ◽  
El Mustafa Ait Chattou ◽  
Younes Saoud ◽  
...  
Keyword(s):  
Growth Rate ◽  
Mytilus Galloprovincialis ◽  
Total Biomass ◽  
Growth Reduction ◽  
Development Stages ◽  
Length Growth ◽  
Spat Collection ◽  
Mediterranean Mussel ◽  
Feeding Effect ◽  
Effect Of Feeding

Spat supply for mussel farming in Morocco is essentially based on seed capture and collection from natural beds. However, natural irregularity recruitment in exploited areas and encountered difficulties during spat collection operations have led to develop and improve reproduction techniques under controlled conditions in hatcheries. The present study focused on the larvae phase aiming at assessing growth rate varies between different development stages. Trocophore larva stage had a size of 63.25 μm and reached the pedivilegere stage with a size of 272.56 μm in 18 culture days. Length growth was more significant than width growth for both H-batch and T-batch. For instance, larvae grew in terms of length quickly in H-batch than T-batch (11.10± 1.30 and 9.67 ± 1.17 μm day-1), and the same pattern was observed for T-batch larvae. Inversely, the total biomass consumed was higher during T-batch larvae rearing than H-batch ones. In contrast, the effect of feeding on growth was observed more significantly for H-batch larvae (t=7.55, df=23, p<0.001) than T-batch ones (t=4.13, df=23, p<0.001). However, the specific feeding effect was revealed higher for I. galbana for both batches rather than C. calcitrans and T. suecica. However, the larvae growth reduction is linked to the beginning of tissue synthesis.

Within-raft variability of the growth rate of mussels, Mytilus galloprovincialis, cultivated in the Rı́a de Arousa (NW Spain)

Aquaculture ◽  
2000 ◽  
Vol 189 (1-2) ◽  
pp. 39-52 ◽  
Author(s):  
José Fuentes ◽  
Victoria Gregorio ◽  
Ramón Giráldez ◽  
José Molares
Keyword(s):  
Growth Rate ◽  
Mytilus Galloprovincialis ◽  
Nw Spain

Continuous Growth of Buffer/Drift Epitaxial Stack Based on 4H-SiC by Quick Change of N2 Flow Rate under High Growth Rate Condition

2019 ◽  
Vol 963 ◽  
pp. 97-100
Author(s):  
Yoshiaki Daigo ◽  
Akio Ishiguro ◽  
Shigeaki Ishii ◽  
Takehiko Kobayashi
Keyword(s):  
Growth Rate ◽  
Carrier Concentration ◽  
Flow Rate ◽  
High Speed ◽  
High Growth ◽  
High Growth Rate ◽  
Average Growth ◽  
Rate Condition ◽  
Continuous Growth ◽  
Drift Layer

N-type 4H-SiC homo-epitaxial films were grown under high growth rate condition by high speed wafer rotation vertical CVD tool, and dependence on N2 flow rate for in-wafer distribution of thickness and carrier concentration was investigated. By adjusting only the N2 flow rate from 0.33 to 130 sccm, average carrier concentration of the SiC film was controlled within a range from 3 x 1015 to 1 x 1018 cm-3, while maintaining good in-wafer uniformity less than ±7.0%. Average growth rate higher than 54 μm/h and in-wafer uniformity less than ±3.1% were maintained and no dependence for thickness distribution on N2 flow rate was observed. Buffer/drift epitaxial stack using quick change of N2 flow rate was fabricated, and the crystalline quality and steepness of N concentration at buffer/drift interface were also investigated. The epitaxial stack showed lower defect density compared with single drift layer and showed steep interface between buffer layer and drift layer.

Growth of Lampsilis radiata (Bivalvia: Unionidae) in Sand and Mud: A Reciprocal Transplant Experiment

1986 ◽  
Vol 43 (3) ◽  
pp. 548-552 ◽  
Author(s):  
Scott G. Hinch ◽  
Robert C. Bailey ◽  
Roger H. Green
Keyword(s):  
Growth Rate ◽  
Shape Change ◽  
Unit Length ◽  
Shell Growth ◽  
Shell Shape ◽  
Transplant Experiment ◽  
Reciprocal Transplant Experiment ◽  
Rate Analysis ◽  
Two Populations

To examine the effects of habitat on shell growth and form, freshwater unionid clams (Lampsilis radiata) were reciprocally transplanted between a sandy and a muddy site in Inner Long Point Bay, Lake Erie. There were significant differences in the initial shell dimensions of the two populations, with the sand clams being larger and less obese than the mud clams. Pretransplant growth rate analysis, using annual rings, showed that long-term growth in the sand was greater than that in the mud. After 16 wk the transplanted clams were recovered. Overall growth rate was affected by the source of the clams, while transplant destination affected shape change (height growth per unit length growth). This suggests that shell growth rates may be under direct genetic control, while shell shape can be adaptively modified by environmental cues.

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