Sexual maturation in female triploid plaice, Pleuronectes platessa, and plaice × flounder, Platichthys flesus, hybrids

Abstract

The gonads of immature female triploid plaice (Pleuronectes plafcssu) and plaice x flounder (Plutichthys j7esus) hybrids produced from cold-shocked eggs were examined. They were less than half the size of those in diploids of similar age and contained only small numbers of developing oocytes. These were similar both in size and cytological appearance to those in the controls. The bulk of the ovarian tissue was composed of nests of small undifferentiated cells resembling the oogonia in the ovaries of diploid fish. Mature, 5 year old triploid hybrids which had not produced eggs over the previous two spawning seasons were killed in January when the diploid controls were nearing spawning condition. The ovaries of these fish were smaller than those of the controls and contained degenerating oocytes at maturation stage V. The advantage of sterile female triploid fish for fish-cultivation is discussed.

Spermatozoa in triploids of the rosy bitterling Rhodeus ocellatus ocellatus

“…In most species, oogenesis in triploid females was interrupted during yolk formation (Lincoln, 1981b;Wolters et al, 1982;Benfey & Sutterlin, 1984;Suzuki et al, 1985a). In contrast to females, triploid males, in general, seem to have the potential for some degree of spermatogenesis (Lincoln, 1981b;Lincoln & Scott, 1984;Ueno, 1985;Nakamura et al, 1993), except for ayu Plecoglossus altivelis Temminck & Schlegel (Ueno et al, 1986). They are, however, inferior to diploid males in milt volume and spermatozoa quality, except for plaice Pleuronectes platessa L. (Lincoln, 1981a).…”

Spermatozoa in triploids of the rosy bitterling Rhodeus ocellatus ocellatus

“…In most species, oogenesis in triploid females was interrupted during yolk formation (Lincoln, 1981b;Wolters et al, 1982;Benfey & Sutterlin, 1984;Suzuki et al, 1985a). In contrast to females, triploid males, in general, seem to have the potential for some degree of spermatogenesis (Lincoln, 1981b;Lincoln & Scott, 1984;Ueno, 1985;Nakamura et al, 1993), except for ayu Plecoglossus altivelis Temminck & Schlegel (Ueno et al, 1986). They are, however, inferior to diploid males in milt volume and spermatozoa quality, except for plaice Pleuronectes platessa L. (Lincoln, 1981a).…”

Abnormal Gametogenesis, Male Dominant Sex Ratio, and Sertoli Cell Morphology in Induced Triploid Mussels, Mytilus galloprowincialis

“…This gonadal sex reversal may have occurred by a minor ZZ line amplification or a mitotic loss of the W (Solari, 1994). In triploid plaice Pleuronectes platessa a high percentage (95%) of males was observed (Lincoln, 1981), yet the occurrence of both males and females in gynogenetic diploids (Purdom and Lincoln, 1973) implies that in this species the female is heterogametic and a Z:W (or Z:O) sex determining mechanism occurs. Sex determination in the newt, Triturus viridescens, follows a Z:W model (Griffiths, 1941).…”

The biology of triploid fish

“…The impact of triploidy on ovarian development is well studied in coho salmon (Piferrer et al, 1994b), rainbow trout (Lincoln and Scott, 1984;Nakamura et al, 1987a, b), masu salmon (Oncorhynchus masou) (Nakamura et al, 1993), plaice (Purdom, 1972;Lincoln, 1981b), channel catfish (Wolters et al, 1982b), European catfish (Krasznai and Marian, 1986), and Indian catfish (Tiwary et al, 2000). Salmonid studies have shown lack of oocyte maturation in female triploids at different stages of development (Thorgaard and Gall, 1979;Scott, 1983, 1984;Yamazaki, 1983;Chevassus et al, 1984;Solar et al, 1984;Solar and Donaldson, 1985;Piferrer et al, 1994b).…”

Spermatozoa in triploids of the rosy bitterling Rhodeus ocellatus ocellatus

“…In most species, oogenesis in triploid females was interrupted during yolk formation (Lincoln, 1981b;Wolters et al, 1982;Benfey & Sutterlin, 1984;Suzuki et al, 1985a). In contrast to females, triploid males, in general, seem to have the potential for some degree of spermatogenesis (Lincoln, 1981b;Lincoln & Scott, 1984;Ueno, 1985;Nakamura et al, 1993), except for ayu Plecoglossus altivelis Temminck & Schlegel (Ueno et al, 1986). They are, however, inferior to diploid males in milt volume and spermatozoa quality, except for plaice Pleuronectes platessa L. (Lincoln, 1981a).…”

Abnormal Gametogenesis, Male Dominant Sex Ratio, and Sertoli Cell Morphology in Induced Triploid Mussels, Mytilus galloprowincialis

“…This gonadal sex reversal may have occurred by a minor ZZ line amplification or a mitotic loss of the W (Solari, 1994). In triploid plaice Pleuronectes platessa a high percentage (95%) of males was observed (Lincoln, 1981), yet the occurrence of both males and females in gynogenetic diploids (Purdom and Lincoln, 1973) implies that in this species the female is heterogametic and a Z:W (or Z:O) sex determining mechanism occurs. Sex determination in the newt, Triturus viridescens, follows a Z:W model (Griffiths, 1941).…”

The biology of triploid fish

“…The impact of triploidy on ovarian development is well studied in coho salmon (Piferrer et al, 1994b), rainbow trout (Lincoln and Scott, 1984;Nakamura et al, 1987a, b), masu salmon (Oncorhynchus masou) (Nakamura et al, 1993), plaice (Purdom, 1972;Lincoln, 1981b), channel catfish (Wolters et al, 1982b), European catfish (Krasznai and Marian, 1986), and Indian catfish (Tiwary et al, 2000). Salmonid studies have shown lack of oocyte maturation in female triploids at different stages of development (Thorgaard and Gall, 1979;Scott, 1983, 1984;Yamazaki, 1983;Chevassus et al, 1984;Solar et al, 1984;Solar and Donaldson, 1985;Piferrer et al, 1994b).…”

Spermatozoa in triploids of the rosy bitterling Rhodeus ocellatus ocellatus

“…In most species, oogenesis in triploid females was interrupted during yolk formation (Lincoln, 1981b;Wolters et al, 1982;Benfey & Sutterlin, 1984;Suzuki et al, 1985a). In contrast to females, triploid males, in general, seem to have the potential for some degree of spermatogenesis (Lincoln, 1981b;Lincoln & Scott, 1984;Ueno, 1985;Nakamura et al, 1993), except for ayu Plecoglossus altivelis Temminck & Schlegel (Ueno et al, 1986). They are, however, inferior to diploid males in milt volume and spermatozoa quality, except for plaice Pleuronectes platessa L. (Lincoln, 1981a).…”

Abnormal Gametogenesis, Male Dominant Sex Ratio, and Sertoli Cell Morphology in Induced Triploid Mussels, Mytilus galloprowincialis

“…This gonadal sex reversal may have occurred by a minor ZZ line amplification or a mitotic loss of the W (Solari, 1994). In triploid plaice Pleuronectes platessa a high percentage (95%) of males was observed (Lincoln, 1981), yet the occurrence of both males and females in gynogenetic diploids (Purdom and Lincoln, 1973) implies that in this species the female is heterogametic and a Z:W (or Z:O) sex determining mechanism occurs. Sex determination in the newt, Triturus viridescens, follows a Z:W model (Griffiths, 1941).…”

The biology of triploid fish

“…The impact of triploidy on ovarian development is well studied in coho salmon (Piferrer et al, 1994b), rainbow trout (Lincoln and Scott, 1984;Nakamura et al, 1987a, b), masu salmon (Oncorhynchus masou) (Nakamura et al, 1993), plaice (Purdom, 1972;Lincoln, 1981b), channel catfish (Wolters et al, 1982b), European catfish (Krasznai and Marian, 1986), and Indian catfish (Tiwary et al, 2000). Salmonid studies have shown lack of oocyte maturation in female triploids at different stages of development (Thorgaard and Gall, 1979;Scott, 1983, 1984;Yamazaki, 1983;Chevassus et al, 1984;Solar et al, 1984;Solar and Donaldson, 1985;Piferrer et al, 1994b).…”