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  • 1
    Electronic Resource
    Electronic Resource
    Otolith reading as a tool for stock identification
    Amsterdam : Elsevier
    Fisheries Research 20 (1994), S. 97-107 
    Details
    ISSN: 0165-7836
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0165-7836(94)90077-9
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pattern of gonad maturation and the question of semelparity in the paedomorphic goby Aphia minuta (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 58 (2001), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: At variance with previous reports, the paedomorphic goby Aphia minuta does not show semelparity, but abbreviate iteroparity like other small Mediterranean gobiid species. In spring, the mature ovary contains several batches of eggs at different stages of vitellogenesis. This indicates that the breeding season of A. minuta is quite long and that spawning takes place at least twice during its short lifespan, involving in each ovulatory wave different batches of oocytes which undergo vitellogenesis at different times. These observations agree with the testicular cycle data. In males, which in spring exhibit active spermiation coinciding with deposition of the first batch of oocytes, spermatogonial mitosis also resumes, eventually resulting in the production of new sperm in summer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2001.tb00520.x
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  • 3
    Electronic Resource
    Electronic Resource
    A new method for three-dimensional otolith analysis (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 54 (1999), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The three-dimensional (3-D) shape and density distribution of a cod otolith was determined using a newly developed micro X-ray tomograph. The technique requires no special treatment of the otolith and could yield the entire 3-D growth history in a single analysis. 999 The Fisheries Society of the British Isles
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1999.tb00627.x
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  • 4
    Electronic Resource
    Electronic Resource
    Aspects of the early life history of European hake from the central Adriatic (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 56 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: During early development, the left and right sagittae of European hake Merluccius merluccius showed dimorphism in both size and shape due to the different number and size of accessory primordia. Juvenile hake reached the total length (LT) of 15 cm in c. 1 year, with monthly growth rates ranging from 1·6 cm month-1 in the third month of life to 1·1 cm month-1 towards the end of the first year. Back-calculated hatch-date distribution indicated continuous spawning with a peak in summer and a second, less evident, peak in February–March. The presence of early demersal juveniles (16–30 mm LT, c. 40 days old) very close to the Pomo pit area (Central Adriatic Sea) at c. 140 m depths indicates that the change from the pelagic to the demersal phase takes place at c. 40 days close to the area of concentration of juveniles. The daily-increment hypothesis was validated indirectly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb02149.x
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  • 5
    Electronic Resource
    Electronic Resource
    Short lifespan and apoptosis in Aphia minuta (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 60 (2002), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Evidence is presented that apoptosis of intestinal enterocytes is implicated in adult mortality immediately after the breeding season in Aphia minuta, a paedomorphic goby that spends its whole life cycle of 〈1 year in the water column as a pelagic and planktophagous fish. This could be the first documented case in which apoptosis triggers a population dynamic process such as natural mortality in a vertebrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2002.tb01703.x
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  • 6
    Electronic Resource
    Electronic Resource
    Age determination and growth of turbot and brill in the Adriatic Sea: reversal of the seasonal pattern of otolith zone formation (2001)
    Oxford UK : Blackwell Science Ltd.
    Journal of applied ichthyology 17 (2001), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The growth of two commercially important flatfish, turbot (Psetta maxima) (L.) and brill (Scophthalmus rhombus) (L.), was investigated in the Adriatic using whole otoliths (sagittae) and stained otolith sections. At variance with the pattern usually observed in temperate seas, the opaque zone was found to be laid down in autumn and winter, and the translucent zone in spring and summer. Growth rates differed according to sex, with the females attaining greater body lengths. The von Bertalanffy growth parameters were: L∞=66.2 cm, K=0.31 years–1, and t0=–0.14 years for turbot males, L∞=81.5 cm, K=0.21 years–1, and t0=–0.48 years for turbot females; L∞=40.2 cm, K=0.49 years–1, and t0=–1.03 years for brill males; L∞=50.1 cm, K=0.27 years–1, and t0=–1.75 years for brill females. Growth rates and maximum age recorded for turbot were comparable to those reported in the North Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0426.2001.00293.x
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  • 7
    Electronic Resource
    Electronic Resource
    Age and growth of the nototheniid fishTrematomus bernacchii Boulenger from Terra Nova Bay, Antarctica (1996)
    Springer
    Polar biology 16 (1996), S. 139-145 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Age and growth of the nototheniid fishTrematomus bernacchii Boulenger 1902 were estimated by reading the sagittal otoliths of 457 adult specimens caught off Terra Nova Bay (Ross Sea) in the austral summer 1990–1991. Annuli in ground and polished otoliths were examined using a dissecting microscope under reflected light. The Von Bertalanffy growth equation was Lt=273.5 [1 − e−0.109(t+2.10)] for males (n=122) and Lt=422.2 [1 − e−0.055(t+1.92)] for females (n=211) where L is total length in millimetres. Maximum estimated age was 21 years for females and 16 years for males. This is in agreement with the hypothesis that considers slow growth and old age as a typical feature of Antarctic fishes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02390434
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  • 8
    Electronic Resource
    Electronic Resource
    Age and growth of the nototheniid fish Trematomus bernacchii Boulenger from Terra Nova Bay, Antarctica (1996)
    Springer
    Polar biology 16 (1996), S. 139-145 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Age and growth of the nototheniid fish Trematomus bernacchii Boulenger 1902 were estimated by reading the sagittal otoliths of 457 adult specimens caught off Terra Nova Bay (Ross Sea) in the austral summer 1990–1991. Annuli in ground and polished otoliths were examined using a dissecting microscope under reflected light. The Von Bertalanffy growth equation was Lt=273.5 [1−e-0.109(t+2.10)] for males (n=122) and Lt=422.2 [1−e-0.055(t+1.92)] for females (n=211) where L is total length in millimetres. Maximum estimated age was 21 years for females and 16 years for males. This is in agreement with the hypothesis that considers slow growth and old age as a typical feature of Antarctic fishes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050038
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  • 9
    Electronic Resource
    Electronic Resource
    Allozymic and morphometric evidence for two stocks of the European anchovy Engraulis encrasicolus in Adriatic waters (1996)
    Springer
    Marine biology 126 (1996), S. 529-538 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Allozyme electrophoresis and morphometric analyses were used to investigate the stock structure of European anchovies (Engraulis encrasicolus L.) captured by Italian vessels in the Adriatic Sea. Twenty four putative enzyme loci were studied, all of which exhibited genotypic proportions in accordance with Hardy-Weinberg predictions. Two loci, IDHP-2 * (isocitrate dehydrogenase, 1.1.1.42) and G3PDH-2 * (glycerol-3-phosphate dehydrogenase, 1.1.1.8), showed significant allele-frequency differences among samples. IDHP-2 * 100 frequencies ranged between 0.35 and 0.88, with lower frequencies recorded in northern waters and areas close to the Italian coastline, while G3PDH-2 * 100 frequencies followed a similar, if less distinct, pattern. For both loci, the trends observed were spatially stable over a 2 yr sampling period. A putative stock-boundary was superimposed onto a map of IDHP-2 * 100 frequencies, and a bootstrapped dendrogram confirmed the genetic separation of the two putative stocks, one located around the north-western Adriatic and the other in the central-southern region. Canonical variate analysis (CVA) of morphometric data collected using a “truss network” indicated that the two putative stocks were morphologically distinct; 89.6 and 88.3% of north-western and central-southern anchovies, respectively, were correctly assigned by discriminant-function analysis. This variation may be related to the presence of two anchovy colour phenotypes, silver and blue, in the Adriatic Sea. Silver anchovies are characteristic of northern areas, while the larger blue fish are found mainly in the deeper southern waters. Current assessment models for the fishery are based on the concept of a consistent identity between consecutive catches at single ports, which our data reject. We discuss the possibility of partitioning fishing effort based on the proportions of the two stocks landed at individual ports.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354635
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