The growth ofOreochromis andersonii (Pisces: Cichlidae) from the Okavango Delta, Botswana, and a comparison of the scale and otolith methods of ageing

Booth, Anthony J.; Merron, Glenn S.; Buxton, CD

doi:10.1007/bf00002488

Cited by 37 publications

(37 citation statements)

References 12 publications

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“…The tendency for the ages of S. analis and S. schomburgkii to be underestimated when using counts of scale circuli rather than otolith annuli parallels the situation with numerous other species (e.g. Boxrucker 1986, Beamish & McFarlane 1987, Casselman 1990, Booth et al 1995)…”

Section: Length and Age Of Sillago Analis And Sillago Schomburgkii Atmentioning

confidence: 58%

Comparisons between the biology of two co-occurring species of whiting (Sillaginidae) in a large marine embayment

et al. 2005

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SynopsisWe compare the biology of the tropical species Sillago analis and the temperate species Sillago schomburgkii in Shark Bay, a large subtropical marine embayment on the west coast of Australia. This environment constitutes the approximate southernmost and northernmost limits of the distributions of these two species, respectively. The annuli visible in sectioned otoliths of S. analis and S. schomburgkii were shown to be formed annually. Their numbers were thus used to age the individuals of these two species, which are morphologically very similar and live in the same habitats. Although the growth rates of S. analis and S. schomburgkii are very similar until maturity is attained, they subsequently diverge, with S. schomburgkii investing relatively more energy into somatic growth. The maximum total lengths and ages of both the females (320 mm, 6 years) and males (283 mm, 8 years) of S. analis were not as great as those of the females (383 mm, 9 years) and males (302 mm, 9 years) of S. schomburgkii. In Shark Bay, S. schomburgkii spawns earlier and longer than S. analis, i.e. August to December vs January to March, which would result in the juveniles of these two species recruiting into nursery areas at different times. In addition, S. schomburgkii spawns earlier and for longer in Shark Bay than in temperate marine waters ~ 800 km further south, presumably reflecting an earlier attainment in that subtropical embayment of the range of water temperatures over which this species typically spawns. However, although environmental conditions in Shark Bay and those temperate marine waters differ markedly, the growth of the corresponding sexes of S. schomburgkii in these two water bodies is similar.3

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Section: Length and Age Of Sillago Analis And Sillago Schomburgkii Atmentioning

confidence: 58%

Comparisons between the biology of two co-occurring species of whiting (Sillaginidae) in a large marine embayment

et al. 2005

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“…In tropical and subtropical areas, check formation has often been linked to periods of low physical activity, such as temporal variations in feeding (Bruton and Allanson, 1974) or reproductive periodicity (Garrod, 1959;Booth et al, 1995;Booth and Merron, 1996), more than environmental factors such as water temperature. Annual increments in the otoliths of C. auratus probably form because of slower somatic growth during spawning seasons, as was confirmed in Nile tilapia, Oreochromis niloticus (Massou et al, 2004).…”

Section: Age and Growthmentioning

confidence: 99%

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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“…Morison et al (1998) mentioned an inflexion point in otolith weight at around the age of maturity. Despite the proven value of previous age determination studies of tilapia species using otoliths (Booth et al 1995, Booth and Merron 1996, Weyl and Hecht 1998, Admassu and Casselman 2000 opercula (Jiménez-Badillo 2004) and annuli in scales (Moreau 1971, Wosnitza-Mendo 1980, Yamaguchi et al 1990), these studies were performed on fish from the wild. Those individuals did not experience as many environmental changes as stocked fish generally do, where at least two RM could be due to a combination of hatching, farm movements and stocking events.…”

Section: Discussionmentioning

confidence: 99%

“…Contrary to temperate areas where annuli are formed each year, the ring marks of otoliths or scales in tropical wild tilapia populations show wide variability. Ring marks could be formed once during the dry summer period (Booth et al 1995, Booth and Merron 1996, Gómez-Márquez 1998 or during winter (Weyl and Hecht 1998), or two times because of a temperature reduction, drying up of water bodies or sexual maturation (Guzmán 1994, Admassu and Casselman 2000, Jiménez-Badillo 2004. Moreover, when these species are subject to stocking, several ring marks can be formed at the farm due to changes in diet, movements between tanks or stress (Britton et al 2004).…”

mentioning

confidence: 99%

Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae)

Ibáñez¹,

Romo-Coronel²

2007

RBT

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Lake Metztitlán was dried up completely in the spring of 1998 and refilled in August of that year. In the period September-November, two cohorts of 1.6 million juveniles of a tilapia hybrid were stocked (Oreochromis aureus/O. niloticus), and monitored every month for one year. Since the date of birth of these juveniles was known, the analyses focused on whether the ring marks of the scales, sagittae and opercula or the circuli of the scales could be used to age them. The ring marks of the scales and opercula showed great variability, and the sagittae had a significant relationship with length, but it is unclear if at least the first ring mark could be formed at the hatchery and reflect changes in diet and/or tank movements in the fish farm. The circuli had a continuous regular behavior, with a formation rate of 10.38±0.93 and 11.38±0.95 circuli/month for the first and second cohorts, respectively. This proportion was maintained during the study period, and could be of help to calculate an approximate age of juveniles, especially in stocked fish that show multiple ring marks because of manipulation in fish farms and stocking events. Rev. Biol. Trop. 55 (3-4): 1005-1013. Epub 2007 December, 28.

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The growth ofOreochromis andersonii (Pisces: Cichlidae) from the Okavango Delta, Botswana, and a comparison of the scale and otolith methods of ageing

Cited by 37 publications

References 12 publications

Comparisons between the biology of two co-occurring species of whiting (Sillaginidae) in a large marine embayment

Comparisons between the biology of two co-occurring species of whiting (Sillaginidae) in a large marine embayment

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

Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae)

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