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  • 1
    Online Resource
    Online Resource
    Physiological mechanisms of buoyancy in eggs from brackish water cod
    Wiley ; 1996
    In:  Journal of Fish Biology Vol. 48, No. 3 ( 1996-03), p. 457-477
    Details
    In: Journal of Fish Biology, Wiley, Vol. 48, No. 3 ( 1996-03), p. 457-477
    Abstract: Newly fertilized eggs of brackish water (Gotland, Baltic Sea) and marine (Lofoten, Norway) cod were investigated with regard to specific gravity, wet and dry weight, water content, chorion weight, and content of protein, free amino acids (FAA), and ions. The eggs had neutral buoyancies equivalent to a salinity of 14 . 3% (range 11 . 5–16 . 2%) in brackish water, and 33 . 0% (range 31 . 8–34 . 5%) in the marine environment. A buoyancy model was developed and showed that this difference was mainly caused by differences in egg water content which was 96.6 ± 0 . 47% and 92.7 ± 0.45% in the brackish and marine eggs, respectively. The higher water content of the brackish eggs resulted from increased water uptake during final oocyte maturation due to higher intracellular contents of FAA, Cl – and NH 4 + . SDS polyacrylamide gel electrophoresis of eggs and oocytes, and measurements of egg protein content suggested that the FAA pool of both egg types originated from hydrolysis of specific yolk proteins. The main contributor seemed to be a protein with a molecular weight of 100 kDa.
    Type of Medium: Online Resource
    ISSN: 0022-1112 , 1095-8649
    URL: Issue
    URL: Article
    DOI: 10.1111/jfb.1996.48.issue-3
    DOI: 10.1111/j.1095-8649.1996.tb01440.x
    Language: English
    Publisher: Wiley
    Publication Date: 1996
    detail.hit.zdb_id: 410564-3
    detail.hit.zdb_id: 1471958-7
    SSG: 21,3
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Fecundity of Northeast Arctic Greenland halibut ( Reinhardtius hippoglossoides )
    Northwest Atlantic Fisheries Organization (NAFO) ; 1999
    In:  Journal of Northwest Atlantic Fishery Science Vol. 25 ( 1999-12), p. 29-36
    Details
    In: Journal of Northwest Atlantic Fishery Science, Northwest Atlantic Fisheries Organization (NAFO), Vol. 25 ( 1999-12), p. 29-36
    Type of Medium: Online Resource
    ISSN: 0250-6408 , 1682-9786 , 1811-8224
    URL: Article
    DOI: 10.2960/J.v25.a3
    Language: English
    Publisher: Northwest Atlantic Fisheries Organization (NAFO)
    Publication Date: 1999
    detail.hit.zdb_id: 2139640-1
    detail.hit.zdb_id: 155652-6
    SSG: 21,3
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  • 3
    Online Resource
    Online Resource
    Variation in annual egg production in individual captive Atlantic cod ( Gadus morhua )
    Canadian Science Publishing ; 1996
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 53, No. 3 ( 1996-03-01), p. 610-620
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 53, No. 3 ( 1996-03-01), p. 610-620
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f95-215
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    Effects of ration on the maturation and fecundity in captive Atlantic herring ( Clupea harengus )
    Canadian Science Publishing ; 1998
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 55, No. 4 ( 1998-04-01), p. 900-908
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 55, No. 4 ( 1998-04-01), p. 900-908
    Abstract: We examined the effects of amount of food on vitellogenic oocyte size and number (fecundity) between two experimental groups of Atlantic herring (Clupea harengus) kept in separate but identical compartments of a large seawater tank. Growth and maturation were monitored for 1.5 years. Each group of 200 fish was fed exclusively on krill. At the end of the experiment, a high-ration group, fed 12 mg ·g fish -1 ·day -1 , had similar weights-at-length as wild specimens of the same stock. A low-ration group fed about half the amount of the high-ration group had significantly lower weights-at-length. Ration had no effect on oocyte size and relative potential fecundity (oocytes per gram), but mean potential fecundity (oocytes per fish) of the low-ration fish was 26% lower than that of the high-ration fish. The relative intensity of early stages of atresia was quantified histologically. Atresia is a common phenomenon in Atlantic herring and increases markedly with suboptimal feeding. Mean relative atretic intensities were estimated at about 3 and 6% for the high- and low-ration groups, respectively, but with large intragroup variation. Modeled realized fecundity (spawned eggs per fish) indicated a 9 and 40% reduction compared with the measured potential fecundities, respectively.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f97-305
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
    Location Call Number Limitation Availability
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  • 5
    Online Resource
    Online Resource
    Oocyte size and structure in relation to blood plasma steroid hormones in individually monitored, spawning Atlantic cod
    Wiley ; 1996
    In:  Journal of Fish Biology Vol. 49, No. 6 ( 1996-12), p. 1197-1215
    Details
    In: Journal of Fish Biology, Wiley, Vol. 49, No. 6 ( 1996-12), p. 1197-1215
    Abstract: A series of seasonal blood and ovarian tissue samples were taken from five female Atlantic cod Gadus morhua at different times between various batches of eggs and subsequently examined for oocyte size, plasma steroid hormones and ultrastructure of the cortex oocyte cytoplasm and follicle layer. This detailed protocol demonstrated that the spawning cod ovary is vitellogenically very active. Individual oocytes were able to develop at different rates, and at least two cohorts of oocytes with a different developmental status were present simultaneously. The concentration of estradiol‐17β varied between batches and decreased over the season. The levels of 17,20β‐P and 11‐deoxycortisol were generally low. Oocytes of an advanced developing cohort showed numerous coated vesicles and closely apposed oocytic and follicular microvilli located in the chorionic pores. The number of oocytic microvilli was estimated at about 1–8 million cell −1 , which increased the oocyte surface area by a factor of 12. Furthermore, the oocytic microvilli were found to stretch during final maturation. This stage‐specific mobility of microvilli is discussed in relation to further incorporation of yolk and the relevant actin‐based cytoskeleton observed for other classes of animals.
    Type of Medium: Online Resource
    ISSN: 0022-1112 , 1095-8649
    URL: Issue
    URL: Article
    DOI: 10.1111/jfb.1996.49.issue-6
    DOI: 10.1111/j.1095-8649.1996.tb01789.x
    Language: English
    Publisher: Wiley
    Publication Date: 1996
    detail.hit.zdb_id: 410564-3
    detail.hit.zdb_id: 1471958-7
    SSG: 21,3
    SSG: 12
    Location Call Number Limitation Availability
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  • 6
    Online Resource
    Online Resource
    Differences in growth performance between Arcto‐Norwegian and Norwegian coastal cod reared under identical conditions
    Wiley ; 1996
    In:  Journal of Fish Biology Vol. 49, No. 1 ( 1996-07), p. 108-119
    Details
    In: Journal of Fish Biology, Wiley, Vol. 49, No. 1 ( 1996-07), p. 108-119
    Abstract: Offspring from seven family groups of Arcto‐Norwegian cod (AN) and a genetically marked Norwegian coastal cod (NC) broodstock, were mixed at metamorphosis and raised in the same rearing unit. The fish were transferred subsequently to a net‐pen and held under standard farming conditions. In December 1992, 466 cod juveniles were measured, weighed, and tagged individually. Length and weight changes were monitored until the fish matured (January 1994). Genotyping of each individual was performed using enzyme electrophoresis to identify the fish to strain. Prespawning females were examined for organ weights and stage of maturity. There were population specific Differences in growth performance. NC displayed significantly higher specific growth rate (SGR) and daily length increment (DLI) during spring/summer season. The AN had significantly lower hepatosomatic and gonadosomatic indices, and were thinner than the NC, indicating Differences in body form and energy allocation pattern between the two strains. All NC (both sexes) became sexually mature at the age of 2 years while 2% of fish in the AN group were still immature at the end of the experiment.
    Type of Medium: Online Resource
    ISSN: 0022-1112 , 1095-8649
    URL: Issue
    URL: Article
    DOI: 10.1111/jfb.1996.49.issue-1
    DOI: 10.1111/j.1095-8649.1996.tb00008.x
    Language: English
    Publisher: Wiley
    Publication Date: 1996
    detail.hit.zdb_id: 410564-3
    detail.hit.zdb_id: 1471958-7
    SSG: 21,3
    SSG: 12
    Location Call Number Limitation Availability
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    Online Resource
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