Sexual dimorphism in four species of rockfish genusSebastes (Scorpaenidae)

Echeverria, Tina

doi:10.1007/bf00002993

Cited by 20 publications

(17 citation statements)

References 19 publications

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“…Sexual size dimorphisms in fish are usually attributable to sexual selection, having evolved with respect to reproductive success (Parker, 1992). In the present study, male C. auratus were smaller than females, as is often the case with fish in which sexual selection favours males that divert energy from growth into reproduction (Echeverria, 1986;Parker, 1992;Pyron, 1996).…”

Section: Age and Growthmentioning

confidence: 89%

Comparisons of age, growth, and maturity between male and female, and diploid and triploid individuals in Carassius auratus from Okinawa‐jima Island, Japan

Takada¹,

Tachihara²

2009

Aquatic Conservation

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ABSTRACT1. Carassius auratus, a primary freshwater fish with bisexual diploid and unisexual gynogenetic triploid lineages, is distributed widely in and around the Eurasian continent and is especially common in East Asia. East Asian C. auratus diverged genetically to form local endemic populations in different regions, and those distributed in the Ryukyu Archipelago form a local endemic population that can be regarded as an evolutionarily significant unit because of its high phylogenetic independence and evolutionary distinctiveness. Although the evolutionary uniqueness of this population should be conserved, its distribution area and population size are decreasing rapidly, and some island populations are currently considered endangered or already extinct.2. To develop effective conservation measures to stop the current decline of Ryukyuan C. auratus, ecological data need to be collected. In this study, life history data for a C. auratus population distributed in the Hiji River system were collected by estimating age, growth, and spawning season.3. The spawning season of C. auratus in the Hiji River extended from March to September, peaking during March-May. Females became sexually mature in their second year, but males reached maturity and were able to spawn as early as in the late spawning season of their year of hatching. Once having reached sexual maturity, males probably continuously stay ripe throughout their life.4. Sagittal otoliths of C. auratus proved to be useful ageing structures because one annual increment is formed on the sagittal otolith before the spawning season in each year. The oldest fish observed were a 10-year-old female and an 11-year-old male. Females showed faster somatic growth and higher final standard length than males, and a sexual size dimorphism was observed.5. The standard length at each age class did not differ between diploid and triploid C. auratus, suggesting that triploid growth rates were almost equal to those of diploids.

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Section: Age and Growthmentioning

confidence: 89%

Comparisons of age, growth, and maturity between male and female, and diploid and triploid individuals in Carassius auratus from Okinawa‐jima Island, Japan

Takada¹,

Tachihara²

2009

Aquatic Conservation

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“…Females were longer and heavier at age than males. Wyllie Echeverria (1986) provided details on this dimorphism in four Sebastes species, including yellowtail rockfish. As noted by Westrheim & Harling (1975), this dimorphism became apparent after fish reached 6-8 years of age (Fig.…”

Section: Discussionmentioning

confidence: 99%

Reproductive performance of yellowtail rockfish,Sebastes flavidus

et al. 1991

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SynopsisField and laboratory studies were conducted for 3 years on the yellowtail rockfish, Sebastes flavidus, from Cordell Bank, California, in order to characterize the reproduction of this species whose northern stocks have declined. Research findings included reversal of the sex ratios and male-female ages and sizes at age throughout the annual cycle, heavier and longer females at age than males after sexual maturation, maturation of females at 6 and males at 8 years, long reproductive lifespans, distinct male and female gonadosomatic index patterns over the annual cycle, age-and size-specific fecundity, no difference between potential and realized fecundity and the seasonal changes associated with gonadogenesis. The reproductive profile of the Cordell Bank yellowtail rockfish provided a base for comparison with northern populations that appeared to differ, especially in age and size.

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“…3), a common feature of Sebastes species (Wyllie Echeverria, 1986;Lenarz and Wyllie Echeverria, 1991). Size dimorphism may be attributed to larger females being capable of producing and accommodating large numbers of embryos, as discussed by Wyllie Echeverria (1986).…”

Section: Discussionmentioning

confidence: 96%

Sexual dimorphism in Sebastes owstoni (Scorpaenidae) from the Sea of Japan

et al. 2007

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Morphological and genetic differences between red and yellow morphotypes of Sebastes owstoni were investigated, utilizing 277 males [84.0-194.3 mm in standard length (SL)] and 542 females (92.3-251.5 mm SL) from the Sea of Japan. All males smaller than 120 mm SL were characterized by red body color. The frequency of specimens with yellow body color thereafter increased gradually with SL, all specimens larger than 170 mm SL being yellow. The specimens with yellow body color were observed throughout the year. All females smaller than 170 mm SL were characterized by red body color, the frequency of specimens with yellow body color tending to slightly increase with SL. However, most females had red body color, except for 16 specimens (177.7-241.5 mm SL) that were yellow, growth-related color change from red to yellow being uncommon. Morphological analysis of 49 males (107.6-193.3 mm SL) and 68 females (108.7-241.5 mm SL) showed the head length, orbit diameter, lower jaw length, and predorsal length to be relatively greater, but the distance between the pelvic and anal fi ns less, in males. A discriminant analysis using Mahalanobis distances resulted in 100% correct assignment of specimens to sex, regardless of SL and body color. In addition, no genetic differences were apparent between red and yellow individuals in mitochondrial DNA sequence analyses from the threonine tRNA to the fi rst half of the control region (498 bp). Accordingly, the differences in body color, maximum size, and the fi ve morphometric characters listed above were considered to represent sexual dimorphism. That evidenced by body color was considered to appear after that shown by morphometric characters, some exceptions in the former occurring in females. This is the fi rst report of permanent sexual dimorphism in body color in Sebastes.

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Sexual dimorphism in four species of rockfish genusSebastes (Scorpaenidae)

Cited by 20 publications

References 19 publications

Comparisons of age, growth, and maturity between male and female, and diploid and triploid individuals in Carassius auratus from Okinawa‐jima Island, Japan

Comparisons of age, growth, and maturity between male and female, and diploid and triploid individuals in Carassius auratus from Okinawa‐jima Island, Japan

Reproductive performance of yellowtail rockfish,Sebastes flavidus

Sexual dimorphism in Sebastes owstoni (Scorpaenidae) from the Sea of Japan

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