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1

Artificial off-season spawning of Eurasian perch Perca fluviatilis L.

100%
Szczerbowski A., Kucharczyk D., Mamcarz A., Luczynski M. J., Targonska K., Kujawa R.
Archives of Polish Fisheries
|
2009
|
tom 17
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nr 2
2

Oxygen consumption and ammonia excretion by Eurasian perch (Perca fluviatilis L.) reared under optimal thermal conditions

84%
Zakes Z., Demska-Zakes K.
Archives of Polish Fisheries
|
2005
|
tom 13
|
nr 2
The aim of the study was to determine the oxygen consumption (OC, mg O₂ kg⁻¹h⁻¹) and ammonia production (AE, mg TAN kg⁻¹h⁻¹) of perch reared in a recirculating system at the optimal temperature for this species of 23°C. The studies were conducted when the fish were undergoing intense fattening on artificial feed. Measurements of metabolic rate were taken 24 hours per day in six size groups of fish (mean body weights (BW) in each group - 18.4, 30.7, 46.4, 56.5, 67.8, 82.3 g). Within the studied perch size range, OC decreased from 336.2 to 185.0 mg O₂ kg⁻¹h⁻¹, and AE from 22.0 to 5.6 mg TAN kg⁻¹h⁻¹. An increase in body weight by 1 g led to an average decrease in oxygen consumption by a mean of 2.53 mg O₂ kg⁻¹h⁻¹ and ammonia excretion by 0.28 mg TAN kg⁻¹ h⁻¹. During the analyzed period, the body weight of perch, the arithmetic dependence between OC-BW and AE-BW, was linear and the determination coefficients R² of the linear regression equations describing these relationships were highly statistically significant at a value exceeding 0.9.
3

Artificial spawning of Eurasian perch, Perca fluviatilis L. using Ovopel

84%
Kucharczyk D., Szczerbowski A., Luczynski M. J., Kujawa R., Mamcarz A., Wyszomirska E., Szabo T., Ratajski S.
Archives of Polish Fisheries
|
2001
|
tom 09
|
nr 1
Spermiation and ovulation in the Eurasian perch Perca fluviatilis L. were induced with Ovopel, pellets containing GnRH, and then compared with hCG and CPE. Males from the control group produced a significantly smaller volume of milt (average about 17mlkg BW⁻¹) than those from the hormonally-treated groups (over 24 ml kg BW⁻¹). Spermatozoa motility was similar in both the treated and untreated males, but the fertilization ability varied significantly between individual males. Over 90% of the treated females ovulated. Ovulation in the control group was noted in a limited number of females. Mean embryo survival to the eyed-egg-stage was over 50% in the treated groups, in contrast to 7.5% in the control group. The poor quality of perch gametes might result from high water temperature oscillations before the natural spawning season. The quality of eggs, expressed as survival to the eyed-egg-stage, decreased with latency time.
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