Causes and Significance of Morphological Variation in Fishes

Barlow, George W.

doi:10.2307/2411595

Cited by 258 publications

(176 citation statements)

References 22 publications

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“…Growth in fish has been found to have a considerable environmental component (Barlow, 1961). However, given that the estimates of L, K and t0 and their variance-covariance matrix were drawn from samples caught in the same year, it is unlikely that the ambient environment would effect Whatever the actual biochemical mechanisms that affects the apparent heterozygote advantage, the theoretical and applied considerations of these findings are of obvious importance.…”

Section: Discussionmentioning

confidence: 99%

Enzyme heterozygosity associated with anatomical character variance and growth in the herring (Clupea harengus L.)

King

1985

Heredity

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Section: Discussionmentioning

confidence: 99%

Enzyme heterozygosity associated with anatomical character variance and growth in the herring (Clupea harengus L.)

King

1985

Heredity

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“…The anterior-to-posterior trend in ossification of structures in U. chuss, U. tenuis and P. chesteri has been reported for several fishes (Barlow, 1961). The head structures, cleithra and precaudal vertebrae ossified before the caudal vertebrae, and anterior rays of the dorsal and anal fins ossified before the posterior rays.…”

Section: Discussionmentioning

confidence: 68%

Identification and Development of Larval and JuvenileUrophycis chuss,U. tenuisandPhycis chesteri(Pisces, Gadidae) from the Northwest Atlantic

Methven¹

1985

J. Northw. Atl. Fish. Sci.

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Pelagic stages of Urophycis chuss, Urophycis tenuis and Phycis chesteri from the Northwest Atlantic were identified by differences in caudal fin-ray and epibranchial gillraker counts, body depth and pigmentation. The adult complement of caudal fin rays in U. chuss (28-34, mean 31.5) and U. tenuis (33-39, mean 36.5) distinguished larvae greater than 7-8 mm SL (standard length). Caudal fin-ray counts in P. chesteri (32-35, mean 33.3) overlapped those of the two Urophycis species. The adult complement of epibranchial gillrakers in U. chuss (3), U. tenuis (2) and P. chesteri (4-5) developed at 12-14 mm in Urophycis and at 16-·18 mm in P. chesteri. Phycis chesteri was deeper-bodied (24.4% SL) than U. tenuis (21.3% SL) which in turn was deeper-bodied than U. chuss (19.3% SL). Pelagic larvae and juveniles of the three species had 3 pelvic fin rays. A size-dependent key to pelagic stages of these species is presented.Black pigment on pelvic fins of pelagic Urophycis and Phycis was absent in newly-demersal specimens. Differences in pigmentation on the midline, pectoral fin base, dorsa-lateral trunk and caudal peduncle helped to separate 5-10 mm Urophycis larvae. Ossification generally occurred at a smaller size in U. ctiuss than in either U. tenuis or P. chesteri for most ofthe structures examined. The mandibular arch, dentary, premaxilla, precaudal vertebrae, branchiostegals, cleithra and parasphenoid ossified first. Pelvic fins were the first fins to develop. The first dorsal fin and the pectoral fins developed last.

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“…The environmental component in meristic characters is determined during the early larval stages when variation in temperature, salinity, oxygen, pH, or food availability can modify the trait (Taning 1946;Barlow 1961;Lindsey 1988). Year class differences in meristics may occur within a single stock in long-lived species when environ- (Schmidt 1921;Blouwetal.…”

Section: Discussionmentioning

confidence: 99%

Genetic and meristic variation in black and smooth oreos in the New Zealand exclusive economic zone

Smith

McMillan

Bull

et al. 2002

New Zealand Journal of Marine and Freshwater Research

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Meristic and genetic methods were used to determine the stock relationships of black Allocytus niger (James, Inada & Nakamura, 1988) and smooth oreo Pseudocyttus maculatus (Gilchrist, 1906) in the New Zealand Exclusive Economic Zone (EEZ). Samples were collected from four management areas-OEO 1 (south-west), OEO 3A (Chatham Rise west), OEO 4 (Chatham Rise east), and OEO 6 (subantarctic) during the 1998 OctoberDecember spawning period. Lateral line scale counts and pyloric caeca counts revealed differences between black oreo samples from OEO 6 and the other three OEO management areas. Lateral line M02028; Published 14 November Received 19 April 2002; accepted 7 August 2002scale counts in smooth oreo showed no significant differences between areas. Genetic analyses of four non-coding regions of nuclear DNA and mitochondrial (mt) DNA haplotypes in black oreo showed no significant differentiation among the four management areas. Likewise for smooth oreo, genetic analyses of five non-coding regions of nuclear DNA and mtDNA haplotypes showed no overall regional differentiation, although there was weak evidence at one locus for a difference between OEO 3A and OEO 6. The data do not reject the null hypothesis of a single genetic stock in New Zealand waters, and are typical of marine species with long pelagic juvenile stages.

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Causes and Significance of Morphological Variation in Fishes

Cited by 258 publications

References 22 publications

Enzyme heterozygosity associated with anatomical character variance and growth in the herring (Clupea harengus L.)

Enzyme heterozygosity associated with anatomical character variance and growth in the herring (Clupea harengus L.)

Identification and Development of Larval and JuvenileUrophycis chuss,U. tenuisandPhycis chesteri(Pisces, Gadidae) from the Northwest Atlantic

Genetic and meristic variation in black and smooth oreos in the New Zealand exclusive economic zone

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