Loss of genetic diversity due to fishing pressure

Loss of genetic diversity in the orange roughy, Hoplostethus atlanticus, caught off New Zealand, was measured by gel electrophoresis of nine polymorphic enzyme loci. There has been a significant reduction in genetic diversity on three spawning sites over the past 6 years, during which time the virgin biomass has been reduced by ∼ 70%. It is suggested that fishing activities which concentrate on spawning populations differentially remove the older and more heterozygous individuals from the virgin stock. Commercial fishing activities may have had significant genetic effects on fish stocks without reducing them to near-extinction levels.

[1]  N. Lebedev.  Elementary populations of fish , 1969 .

[2]  R. K. Koehn,et al.  POPULATION GENETICS OF MARINE PELECYPODS. IV. SELECTION, MIGRATION AND GENETIC DIFFERENTIATION IN THE BLUE MUSSEL MYTILUS EDULIS , 1976, Evolution; international journal of organic evolution.

[3]  B. Sidell,et al.  Stock Definition in Atlantic Herring (Clupea harengus harengus): Genetic Evidence for Discrete Fall and Spring Spawning Populations , 1982 .

[4]  M. Soulé,et al.  Biological Sciences: Island Lizards: the Genetic-Phenetic Variation Correlation , 1973, Nature.

[5]  E. Verspoor.  Reduced Genetic Variability in First-Generation Hatchery Populations of Atlantic Salmon (Salmo salar) , 1988 .

[6]  Michael S. Johnson.  Founder effects and geographic variation in the land snail Theba pisana , 1988, Heredity.

[7]  P. J. Smith,et al.  Genetic similarity between samples of the orange roughyHoplostethus atlanticus from the Tasman Sea, South-west Pacific Ocean and North-east Atlantic Ocean , 1986 .

[8]  Robert H. Smith,et al.  Lack of biochemical polymorphism in British fallow deer , 1985, Heredity.

[9]  P. J. Smith,et al.  Esterase gene frequencies and temperature relationships in the New Zealand snapper Chrysophrys auratus , 1979 .

[10]  N. Ryman,et al.  Genetic Variation in Atlantic Cod (Gadus morhua) Throughout Its Range , 1985 .

[11]  E. Zouros,et al.  The use of allelic isozyme variation for the study of heterosis. , 1987, Isozymes.

[12]  P. Smith.  Homozygous excess in sand flounder, Rhombosolea plebeia, produced by assortative mating , 1987 .

[13]  R. Ward,et al.  Protein variation in the plaice, Pleuronectes platessa L. , 1977, Genetical research.

[14]  M. C. Grant,et al.  Associations Among Protein Heterozygosity, Growth Rate, and Developmental Homeostasis , 1984 .

[15]  S. O’Brien,et al.  The Cheetah Is Depauperate in Genetic Variation , 1983, Science.

[16]  Ian J. Doonan,et al.  Growth and productivity of orange roughy (Hoplostethus atlanticus) on the north Chatham Rise , 1990 .

[17]  G. Winans.  Genetic Variability in Chinook Salmon Stocks from the Columbia River Basin , 1989 .

[18]  GENE FLOW IN MAINLAND AND INSULAR POPULATIONS OF CRASSOSTREA (MOLLUSCA) , 1984 .

[19]  R. Selander,et al.  Elephant Seals: Genetic Variation and Near Extinction , 1974, Science.

[20]  R. K. Koehn,et al.  Genetic organization and adaptive response of allozymes to ecological variables in Fundulus heteroclitus. , 1975, Genetics.

[21]  P. Gaffney,et al.  Genetic heterozygosity and growth rate in Mytilus edulis , 1984 .

[22]  N. Merrett,et al.  The correct identification of two trachichthyid fishes (Pisces, Berycomorphi) from the slope fauna west of Britain, with notes on the abundance and commercial importance of Hoplostethus atlanticus , 1983 .

[23]  E. Zouros.  On the relation between heterozygosity and heterosis: an evaluation of the evidence from marine mollusks. , 1987, Isozymes.

[24]  T. Dobzhansky,et al.  A FURTHER STUDY OF CHROMOSOMAL POLYMORPHISM IN DROSOPHILA WILLISTONI IN ITS RELATION TO THE ENVIRONMENT , 1954 .

[25]  W. Grant.  Biochemical genetic divergence between Atlantic, Clupea harengus, and Pacific, C. pallasi, Herring , 1986 .