EJPAU, 1999, Volume 2, Issue 2
Fisheries

 

No /
Available Online		 Discipline
Sort By:
Date - Title
Abstracts:
Hide Abstracts
Title
Autors
2(2) #01
01 Sep 1999		 Fisheries
A PRELIMINARY BIOLOGICAL AND MORPHOMETRIC CHARACTERISTICS OF RIVER LAMPREY (Lampetra fluviatilis (L.)) FROM LAKE DABIE
Mariusz Raczyński, Jarosław Filipiak
citation  abstract  html pdf 
The river lamprey caught in Lake Dabie in the autumn seasons of 1997 (35 individuals) and 1998 (53 individuals) had mean individual weights of 145.1 and 139.3 g, respectively, their respective mean body lengths being 443.9 and 400.8 mm. The largest and the smallest individuals weighed 226.9 and 70.4 g, respectively. The post-dorsal lengths was the only plastic character, out of the 16 characters determined separately in females and males (sex ration of 2.1:1), which showed a substantial between-sexes difference.
2(2) #02
01 Sep 1999		 Fisheries
EFFECTS OF INTRAVENTRICULAR MELATONIN MICROINJECTIONS ON HYPOTHALAMIC CATECHOLAMINE ACTIVITY IN CARP FEMALES DURING A YEAR
Włodzimierz Popek, Piotr Epler
citation  abstract  html pdf 
Assays, made on 64 mature carp females aged 5 years, were performed during the spawning season (summer) and in mid-winter. Some fish were subject to intraventricular melatonin microinjections, while other had their pineal gland excised. Intensity of fluorescence in the hypothalamic aminergic nuclei was determined with the fluorescence histochemical method. The lowest fluorescence intensity was revealed in those individuals lacking the pineal gland, the highest intensity being typical of the fish subject to intraventricular melatonin microinjections. In the winter series, all the fish showed a similar fluorescence intensity in the hypothalamic region studied. The results demonstrate a relationship between the pineal gland, melatonin, and the hypothalamic aminergic system, present in carp during the spawning period.
2(2) #03
01 Sep 1999		 Fisheries
COMPARISON OF THE EFFECTS OF CAGE–REARING OF STERLET (Acipenser ruthenus) AND RUSSIAN × SIBERIAN STURGEON (Acipenser gueldenstadetdti × A. baeri) HYBRID FRY IN COOLING WATER
Jarosław Filipiak, Przemysław Czerniejewski, Jacek Sadowski, Rajmund Trzebiatowski
citation  abstract  html pdf 
Within 17 September – 31 October 1997, fry of the Russian × Siberian sturgeon hybrid of 31.1 g mean individual weight and sterlet fry of 25.4 g mean individual weight were fed two trout feeds: the Dana–ex 4.85 and the Safir differing, i.a., in their gross energy content (5470 and 5173 Kcal·g–1, respectively), each feed being offered in triplicate. The fish were kept in cages, stocked at 80 ind./cage, placed in power station cooling water of temperature changing within 12.2–23°C. Water temperature–dependent differences in fish growth were revealed: the hybrid grew better at 19–23°C, while the sterlet growth was better at 12–18°C. In both fish groups, the Dana–ex 4.85 produced better food conversion rate (FCR) and apparent net protein utilisation (aNPU).
2(2) #04
01 Sep 1999		 Fisheries
THE EFFECT OF TIME AND TEMPERATURE ON MOTILITY OF SPERMATOZOA OF COMMON AND GRASS CARP
Barbara Jezierska, Małgorzata Witeska
citation  abstract  html pdf 
The sperm collected from common and grass carp males was stored at 5oC, and activated with water of various temperatures (20, 26, and 30oC). Time of spermatozoa motility was measured. Motility decreased with time after milt collection. Common carp spermatozoa were active longer, up to 70–80 s. In most series their activity was reduced after 24 hours. Spermatozoa of grass carp were active up to 30–55 s, and their motility shortened already in 8 hours post collection. After 24 hours they were motile less than 10 s. The effect of temperature of activation was observed – the spermatozoa were active for the longest time at 20oC. Spermatozoa motility time was also affected by temperature of storage. Even short–term (15 min) keeping spermatozoa at 20oC shortened their motility time in both species, and after 2 hour storage common carp sperm motility was reduced by about 50%. Storage or acclimation at high temperature reduced also spermatozoa viability (ability to undertake
2(2) #05
01 Sep 1999		 Fisheries
ARTIFICIAL SPAWNING OF IDE (LEUCISCUS IDUS) UNDER CONTROLLED CONDITIONS
Dariusz Kucharczyk, Roman Kujawa, Andrzej Mamcarz, Elżbieta Wyszomirska, Dariusz Ulikowski
citation  abstract  html pdf 
The present paper describes the results of induction spermiation and ovulation of ide (Leuciscus idus L.) during and out of spawning season using CPE with addition of hCG, hCG and ovopel - GnRH containing pellets. Males from control group produced significantly smaller volume of milt (season) than those from hormonally treated groups. Significant differences in spermatozoa motility was noted between treated and control males. The percent of ovulated females from groups treated with CPE and ovopel was 100%. Fish from control groups and treated with hCG did not ovulate. The total spawners mortality was quite high, especially in fish treated with ovopel. Generally, all recorded parameters in out of spawning season were lower than those obtained during artificial propagation in natural spawning time.
Legend:  Citation Citation Information     Abstract View Abstract     Article (HTML) View Article (HTML)     Article (PDF) View Article (PDF)