The relationship between specific growth rate and swimming performance in male fathead minnows (Pimephales promelas)

1995 ◽  
Vol 73 (11) ◽  
pp. 2165-2167 ◽  
Author(s):  
Alan S. Kolok ◽  
James T. Oris
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Swimming Speed ◽  
Specific Growth ◽  
Swimming Performance ◽  
Pimephales Promelas ◽  
Significant Negative Correlation ◽  
Fathead Minnows ◽  
Critical Swimming Speed ◽  
The Relationship

The objective of this study was to test the hypothesis that the specific growth rate of male fathead minnows (Pimephales promelas) was positively correlated with swimming performance. Subadult fish were allowed to grow into adults over a period of 31 – 55 days, after which the critical swimming speed of each fish was determined. Variation in critical swimming speed was substantial (greater than 50%), and a significant positive correlation was found between number of growing days and critical swimming speed, whereas a significant negative correlation was found between specific growth rate and critical swimming speed. A multiple regression using specific growth rate and number of growing days explained over 47% of the variation in swimming performance. Fathead minnows that grow fast are poor swimmers, suggesting a trade-off between swimming performance and specific growth rate in this species.

scholarly journals A comparison of two methods for estimating critical swimming speed (UCRIT) in larval fathead minnows: the laminar flow assay and the spinning task assay

2021 ◽  
Author(s):  
Julie C. Krzykwa ◽  
Gabriella S. Lamanteer ◽  
Marlo K. Sellin Jeffries
Keyword(s):  
Laminar Flow ◽  
Swimming Speed ◽  
Good Predictor ◽  
Swimming Performance ◽  
Fathead Minnows ◽  
Critical Swimming Speed ◽  
Suitable Alternative ◽  
Time Points ◽  
Alternative Method

Critical swimming performance (UCRIT) is considered a good predictor of swimming capabilities in fish. To estimate UCRIT, a fish is exposed to an incrementally-increasing laminar flow of water until it cannot maintain its position against the current. The spinning task assay has been proposed as an alternative method to traditional laminar flow methods; however, these methods have not been directly compared. Thus, the goal of this study was to determine whether the spinning task assay is a suitable alternative to traditional laminar flow assays. To that end, the performance of fathead minnows in each assay was compared at three time points (14, 19 and 24 days post fertilization, dpf). In 14 dpf fish, UCRIT estimates were similar regardless of the assay used. However, at 19 and 24 dpf, UCRIT estimates derived from the two assay types were significantly different. This indicates that the assays are not equivalent to one another and that the spinning task assay is not a suitable alternative to the laminar flow assay for the determination of UCRIT.

Effects of N/P Atomic Ratio on the Growth of Alexandrium Tamarense at Various Initial Phosphate Concentrations

2012 ◽  
Vol 455-456 ◽  
pp. 1289-1296
Author(s):  
Shi Yong Wen ◽  
Dong Zhi Zhao ◽  
Li Li Song ◽  
Hua Long
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Cell Density ◽  
Specific Growth ◽  
Red Tide ◽  
Atomic Ratio ◽  
Maximum Specific Growth Rate ◽  
Alexandrium Tamarense ◽  
Nutrient Input ◽  
The Relationship

To reveal the relationship between nutrient input and red tide outbreaks, the effects of N/P atomic ratio on the specific growth rate of Alexandrium tamarense is analyzed under various initial phosphate concentrations in laboratory cultures. The results show that both the cell density and the specific growth rate of A.tamarense first increased when the N/P atomic ratio ≤ (N/P)opt and then decreased when the N/P atomic ratio ≥ (N/P)opt in low-P-grown cultures, followed by those in medium-P-grown and high-P-grown cultures. And the highest cell density in low-P-grown, medium-P-grown, and high-P-grown cultures is 1776×104, 4094×104 and 6891×104 cells/L, respectively. The maximum specific growth rate is 4.022, 5.307 and 9.672 d-1, respectively. It seems that the higher the initial phosphate concentrations, the greater the probability of red tide outbreaks.

scholarly journals The Relationship Between the Biokinetic Parameters of an Aerobic Granular Sludge System and the Applied Operating Conditions

2021 ◽  
Vol 31 (1) ◽  
pp. 161-171
Author(s):  
Nur Ain Hamiruddin ◽  
Nik Azimatolakma Awang
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Biomass Production ◽  
Specific Growth ◽  
Granular Sludge ◽  
Maximum Specific Growth Rate ◽  
Operating Conditions ◽  
Aerobic Granular Sludge ◽  
Biokinetic Parameters ◽  
The Relationship

Abstract Biokinetic parameters help to describe the rate of substrate utilization and biomass production or growth by microbial action, which is important to the design process and performance optimization of wastewater treatment. Although studies of the biokinetic parameters of aerobic granular sludge (AGS) systems have been increasing lately, the significance for each value in terms of maximum specific growth rate (μmax), substrate concentration at one-half of the maximum specific growth rate (KS), and cell yield (Y) in relation to the applied operating conditions are rarely discussed. Therefore, this study investigates the relationship and significance between the above-stated biokinetic parameters with organic loading rate (OLR) and reactor height/diameter (H/D) ratio from five different batches of AGS treated sewage, using the independent t-test. The biokinetic parameters are summarized as biomass production (Y and μmax ) and relied upon the relative increase in the OLR and reactor H/D ratios. Additionally, aerobic granules developed in reactors with a high H/D ratio have a shorter setup time and are more active in contrast with low H/D ratio reactors.

scholarly journals Degradation of o-xylene by a novel strain, Zoogloearesiniphila HJ1: Identification, kinetics and metabolic pathway

2017 ◽  
Vol 19 (2) ◽  
pp. 241-250
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Maximum Specific Growth Rate ◽  
Ring Cleavage ◽  
Yield Coefficient ◽  
Metabolic Intermediates ◽  
Haldane Model ◽  
Catechol 1,2 Dioxygenase ◽  
The Relationship

Biodegradation has become a popular alternative remediation technology due to its economical and ecological advantages. A strain able to degrade o-xylene effectively was selected and identified as Zoogloearesiniphila HJ1. The organism, strain HJ1, could degrade o-xylene with concentration as high as 256 mg L–1 at pH 6.8 and 26.3 °C. The Haldane model adequately described the relationship between specific growth rate and substrate concentration. The maximum specific growth rate and yield coefficient were 0.118 h-1 and 0.2572, respectively. A high mineralization rate of 67.9% was observed. Theenzyme activity and metabolic intermediates analysis showed that the ring cleavage of o-xylene was catalyzed by catechol 1,2-dioxygenase, and 3,4-dimethylcatechol was the main metabolic product. The present study demonstrated that the isolated strain, Zoogloearesiniphila HJ1, had a great application prospect for remediation of o-xylene-contaminated environment.

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