Abstract
Long-term data on the numbers of eggs of cod Gadus morhua callarias in ichthyoplankton and the seasonal variation of their distribution in the Gdansk Deep of the Baltic Sea are considered. The spring peak of spawning was observed for the years 1948–1954 and 1960–1964; the spring-summer peak for 1968–1977; and the summer peak for 1955–1959 and 1995–2001. Maximum egg numbers of cod were recorded from the late 1940s to the early 1950s; minimums were recorded in the late 1980s and the late 1990s. The decrease in the numbers of cod eggs in the ichthyoplankton, in general, coincided with a decrease in the proportion of spawners maturing at the beginning of the season of mass reproduction and a decrease in the oxygen content in the near-bottom layer of the Gdansk Deep. It is suggested that a shift of the spawning peak of cod from spring to summer is related to a decrease in the volume of near-bottom waters providing favorable conditions for the reproduction of this population.
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References
F. E. Alekseev and E. I. Alekseeva, Determination of Maturity Stages in Gonads and the Study of Sexual Cycles, Egg Production, and the Rate of Sexual Maturation in Marine Commercial Fish. Methodical Guide (AtlantNIRO, Kaliningrad, 1996).
F. E. Alekseev and E. I. Alekseeva, “Spatial Differentiation and the Rate of Sexual Maturation in Cod of the Southeastern Baltic Regions,” in Commercial-Biological Studies of AtlantNIRO in the Baltic Sea in 1996–1997 (Atlant. NII Rybn. Khoz. Okeanogr., 1998), pp. 36–44.
Anonym. Report of the Baltic International Fish Survey Working Group. Copenhagen. ICES CM 2002/G:05.
Atlantic Cod: Biology, Ecology, and Fishery, Ed. by G. G. Matishov and A. V. Rodin (Nauka, St. Petersburg, 1996) [in Russian].
O. Bagge, F. Thurov, E. Steffensen, and J. Bay, “The Baltic Cod,” Dana 10, 1–28 (1994).
K. Brander, “Comparison of Spawning Characteristics of Cod (Gadus morhua) Stocks in the North Atlantic,” NAFO Sci. Council Stud., No. 18, 13–20 (1993).
F. Chrzan, “Investigation on the Stock Composition of Cod-Catches in the South-Eastern Baltic in 1948–1951,” Rep. Sea Fish. Inst. Gdynia, No. 7, 11–32 (1954).
G. Claireaux, D. M. Webber, S. R. Kerr, and R. G. Boutilier, “Physiology and Behaviour of Free-Swimming Atlantic Cod (Gadus morhua) Facing Fluctuating Salinity and Oxygen Conditions,” J. Exp. Biol. 198, 61–69 (1995).
Commercial Atlas of the Baltic Sea (Subarea 26, the RF Zone) for 1999 (AtlantNIRO, Kaliningrad, 2000).
Commercial Atlas of the Baltic Sea (the RF Zone of Subarea 26) for 2000 (AtlantNIRO, Kaliningrad, 2001).
Commercial Atlas of the Baltic Sea (the RF Zone of Subarea 26) for 2001 (AtlantNIRO, Kaliningrad, 2002).
CORE. Mechanisms Influencing Long-Term Trends in Reproductive Success and Recruitments of Baltic Cod: Implications for Fisheries Management (AIR2-CT94-1126. Final Rep. (1997).
T. F. Dement’eva, “On the State of Stocks of Cod (Gadus) and Baltic Herring (Clupea harengus membra) in the Baltic Sea,” Tr. Vses. Nauchno-Issled. Inst. Rybn. Khoz. Okeanogr. 26, 79–101 (1954).
V. N. Feldman, N. A. Nazarov, and A. S. Zezera, “Multi-Term Dynamics of Stocks of Commercial Fishes of the Baltic Sea and the Effects on Them of the Environmental Factors and Fishery in the Baltic Regions,” in Commercial-Biological Studies of AtlantNIRO in the Baltic Sea in 1996–1997 (Atlant. NII Rybn. Khoz. Okeanogr., 1998), pp. 6–12.
V. Feldman, N. A. Nazarow, A. S. Zezera, and E. S. Zezera, “Salinity/Oxygen Regime of Water in the South-Eastern Part of Baltic Proper in 1992–1995 and Demersal Fish Living Conditions,” ICES CM, 1995/J:21 (1995).
K. T. Frank, K. F. Drinkwater, and F. H. Page, “Possible Causes of Recent Trends and Fluctuations in Scotian Shelf/Gulf of Maine Cod Stocks,” ICES Mar. Sci. Symp. Cod Climate Change 198, 110–120 (1994).
D. J. Garrod and A. Schumacher, “North Atlantic Cod: The Broad Canvas,” ICES Mar. Sci. Symp. Cod Climate Change 198, 59–76 (1994).
A. Glowinska, “Stany Hydrologichne Poludniowego Baltyku,” Prace Morsk. Instytutu Rybackiego. Tom jubileuszowy. Gdynia, 201–232 (1971).
G. B. Grauman, “Some Data on the Reproduction of Baltic Cod from 1954 to 1957,” Tr. Balt. Nauchno-Issled. Inst. Rybn. Khoz. Okeanogr., No. 4, 327–334 (1958).
G. B. Grauman, “Features of the Cod Spawning in the Baltic in 1961,” Ann. Biol., No. 18, 128–129 (1963).
G. B. Grauman, “Investigations of Factors Influencing Fluctuations in Abundance of Baltic Cod,” Rapp. et Proc.-Verb. Reun. Commis. Int. Explor. Sci. Mer. Mediterr. 164, 73–76 (1973).
G. B. Grauman, “Specific Ecological Features of Reproduction of the Main Pelagophilous Fish in the Baltic Sea,” Fissherei-Forsshung. Rostock 8(2), 77–81 (1980).
M. V. Gulidov, “The Effects of Environmental Gas Conditions on Animal Embryogenesis,” in Environment and the Developing Organism (Nauka, Moscow, 1977), pp. 174–209 [in Russian].
E. M. Karasiova, “The Reproductive Strategy of the Baltic Cod and Some Aspects of Formation of the Numbers of Its Generations,” Vopr. Rybolovstva (Suppl. 1): Materials of the All-Russia Conference on the Early Stages of Development of Hydrobionts as a Basis for Formation of Bioproductivity and Stocks of Commercial Species in the World Ocean, 114–116 (2001)
E. M. Karasiova, “The Long-Term Variation of the Egg Numbers of Cod (Gadus) and Sprat (Sprattus) in the Ichthyoplankton of the Baltic Sea as an Indicator of the Dynamics of Its Ecosystem in the 20th Century,” Izv. Tikhookean. Nauchno-Issled. Inst. Rybn. Khoz. Okeanogr. 137, 196–206 (2004).
E. M. Karasiova, “On the Possible Relation of the Cod Peak Spawning Timing with the Environmental Conditions in the Gdansk Deep of the Baltic Sea,” ICES CM, 1999/Y:29, 1–15 (1999).
E. M. Karasiova and R. Voss, “Long-Term Variability of Cod and Sprat Eggs Abundance in Ichthyoplankton of the Baltic Sea,” ICES CM 2004/L:07, 1–30 (2004).
I. V. Karpushevskii, “Distribution of Cod (Gadus morhua callarias L.) in the Economic Zone of Russia in the Period of Performing Trawl Surveys in 1993–2000. The Course of Maturation of Cod Represented in Commercial Catches,” in Commercial-Biological Studies of AtlantNIRO in the Baltic Sea in 1998–1999 (Atlant. NII Rybn. Khoz. Okeanogr., 2000), pp. 180–187.
F. W. Koester, C. Moellmann, S. Neuenfeldt, et al., “Developing Baltic Cod Recruitment Models. I. Resolving Spatial and Temporal Dynamics of Spawning Stock and Recruitment for Cod, Herring and Sprat,” Can. J. Fish. Aquat. Sci., No. 58, 1516–1533 (2001).
M. Kosior, “Polish Cod Investigations in the Southern Baltic in 1965,” Ann. Biol., No. 22, 89–90 (1967).
M. Kosior, “Cod of the Southern Baltic in the Years 1965–1967,” Prace MIR, Ser. A. 6, 143–168 (1971a).
M. Kosior, “Polish Cod Investigations in the Southern Baltic in 1968 and 1969,” Ann. Biol., No. 26, 130–131 (1971b).
M. Kosior, “Polish Cod Investigations in the Southern Baltic in 1970,” Ann. Biol., No. 27, 90 (1972).
M. Kosior, “Polish Cod Investigations in the Southern Baltic in 1971,” Ann. Biol., No. 28, 102–103 (1973).
M. Kosior, “Polish Cod Investigations in the Southern Baltic in 1972,” Ann. Biol., No. 29, 81 (1974).
M. Kosior, “Polish Cod Investigations in the Southern Baltic in 1973,” Ann. Biol., No. 30, 94–95 (1975).
M. Kosior, “Polish Investigations on State of the Southern Baltic Cod Stocks in 1974,” Ann. Biol., No. 31, 91–92 (1976).
M. Kosior, “Polish Investigations on the Southern Baltic Cod Stocks in 1975 and 1976,” Ann. Biol., No. 33, 90–91 (1978).
M. Kosior, “Polish Investigations on the Southern Baltic Cod Stocks in 1977,” Ann. Biol., No. 34, 121–122 (1979).
M. Kosior, “Polish Investigations on the Southern Baltic Cod Stocks in 1978,” Ann. Biol., No. 35, 134–135 (1980).
M. Kosior, “Polish Investigations on the Southern Baltic Cod Stocks in 1979,” Ann. Biol., No. 36, 111–113 (1981).
B. R. MacKensie, H.-H. Hinrichsen H.-H., M. Plikshs, et al., “Quantifying Environmental Heterogeneity: Habitat Size Necessary for Successful Development of Cod Gadus morhua Eggs in the Baltic Sea,” Mar. Ecol. Prog. Ser. 193, 143–156 (2000).
H. N. Majer, “Beitrage zur Altersbestimmung der Fische. I. Allgemeines. Die Altersbestimmung Nach Otolithen bei Scholle und Kabeljau,” Deutsch. Wiss. Komm. Meeresforschung., B, No. 5 (1908).
V. V. Makhotin, Yu. B. Burykin, and G. G. Novikov, “Cod of the White Sea Gadus morhua marisalbi Derjugin: Biology of Reproduction and Development,” Vopr. Ikhtiol. 26(1), 74–79 (1986).
G. G. Matishov, K. V. Galaktionov, S. F. Timofeev, et al., “Modern Problems of Marine Biology and Ichthyology as Related to the Oceanic Periglacial of the Arctic Regions,” in Atlantic Cod (Nauka, St. Petersburg, 1986), pp. 10–30 [in Russian].
T. Pedersen, “Variation of Peak Spawning of Arcto-Norwegian Cod (Gadus morhua L.) during the Period 1929–1982 Based on Indices from Fishery Statistics,” in The Propagation of Cod, Ed. by E. Dahl et al. Flodevigen Rapportser, No. 1, 301–336 (1984).
M. Plikshs, M. Kaleis, and G. Grauman, The Influence of Environmental Conditions and Spawning Stock Size on the Year-Class Strength of the Eastern Baltic Cod. ICES CM 1993/J:2 (1993).
V. P. Ponomarenko, “Distribution of Mature Cod Gadus morhua morhua of the Barents Sea in Relation to Seasonal Variation in the Maturity of Gonads,” Vopr. Ikhtiol. 36(3), 363–368 (1996) [J. Ichthyol. 36 (5), 385–390 (1996)].
J. Rice, “Recovering Canadian Atlantic Cod Stocks: The Shape of Things to Come?,” ICEs CM, 2003/U:06. Abstracts. Copenhagen, 170 (2003).
S. Rutkowich, “Polish Investigations on the Southern Baltic Cod in 1959,” Ann. Biol., No. 16, 140–141 (1961).
S. Rutkowich, “The Results of Investigations on the Stock of Cod (Gadus callarias L. in the South-Eastern Area of the Baltic Sea in the Years 1946–1960,” Rep. Sea Fish. Inst. Gdynia, Ser. A, No. 12, 165–211 (1963).
M. Serchuk, M. D. Grosslein, R. G. Lough, et al., “Fishery and Environmental Factors Affecting Trends and Fluctuations in the Georges Bank and Gulf of Maine Atlantic Cod Stocks: An Overview,” ICES Mar. Sci. Symp. Cod Climate Change 198, 77–109 (1994).
M. Ya. Shirokova, “Specific Features of Early Oogenesis of the Baltic Sea Cod,” in The Biology of Commercial Fishes, the Formation of Their Productivity, and the Ways of Controlling Fishery in the Baltic Sea (Atlant. NII Rybn. Khoz. Okeanogr., 1971), pp. 114–123.
STORE Baltic Project. Environmental and Fisheries Influences on Fish Stock Recruitment in the Baltic Sea, Part 1 (2002).
K. Wieland, A. Jarre-Teichmann, and K. Horbowa, “Changes in the Timing of Spawning of Baltic Cod: Possible Causes and Implications for Recruitment,” ICES J. Mar. Sci., No. 57 (2), 452–464 (2000).
A. S. Zezera, “Main Features of the South-Eastern Baltic Sea Hydrological Regime in 2000 and the Latest Retrospective,” ICES CM 2001/W:21 (2001).
A. S. Zezera, “Long-Term Changes in Hydrological Characteristics of Deep-Sea Waters of the Southeastern Baltic Regions (1980–2000),” in Commercial-Biological Studies of AtlantNIRO in the Baltic Sea in 2000–2001 (Atlant. NII Rybn. Khoz. Okeanogr., 2002), Vol. 2, pp. 7–12.
A. S. Zezera and E. A. Gribov, “Advection of the North Sea Waters to the Baltic Sea in 2003,” in Commercial-Biological Studies of AtlantNIRO in 2002–2003 (Atlant. NII Rybn. Khoz. Okeanogr., 2004), Vol. 1, pp. 105–115.
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Original Russian Text © E.M. Karasiova, 2006, published in Voprosy Ikhtiologii, 2006, Vol. 46, No. 3, pp. 345–355.
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Karasiova, E.M. Long-term variation in dates of mass spawning of cod Gadus morhua callarias (Gadidae) in the southeastern part of the Baltic Sea. J. Ichthyol. 46, 359–368 (2006). https://doi.org/10.1134/S003294520605002X
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DOI: https://doi.org/10.1134/S003294520605002X