Comparison of age estimates from scale, opercular bone, otolith, vertebrae and dorsal fin ray in Labeo rohita (Hamilton), Catla catla (Hamilton) and Channa marulius (Hamilton)

Khan, Mohammad Afzal; Khan, Shahbaz

doi:10.1016/j.fishres.2009.08.005

Cited by 39 publications

(57 citation statements)

References 24 publications

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“…According to Jhingran (1957), Natarajan and Jhingran (1963), and Kamal (1969), in C. mrigala and C. catla scales showed clear annulations. In the first published report on precision of age estimates from different aging structures of Indian freshwater fishes, it was observed that in L. rohita, C. catla, and C. marulius, among different structures (scales, otoliths, opercular bones, vertebrae, and dorsal fin rays), scales were the most suitable structure for aging L. rohita and C. marulius, and opercular bones were best for C. catla (Khan and Khan 2009). In addition to having clear and sharp annuli, scales also have the advantages of easy collection, which is non-destructive to the fish.…”

Section: Discussionmentioning

confidence: 99%

“…Scales were washed, cleaned, and studied as dry mounts after removing the extraneous matter and mucous by washing them in tap water and rubbing in between the finger tips. To make scales more clear and soft, the large scales were dipped in weak solution (1%) of KOH for about 5-10 min, and then washed in tap water and dried in air (Khan and Khan 2009). Since the scales attain a fairly large size and are translucent, they were read with the help of a magnifying glass.…”

Section: Methodsmentioning

confidence: 99%

“…Otoliths were washed, cleaned, and read whole by immersion in alcohol and examined under microscope using reflected light. Otoliths with unclear annual rings were ground with sandpaper to make the annuli more distinct (Khan and Khan 2009).…”

Section: Methodsmentioning

confidence: 99%

“…In case of disagreement between readers, the aging structures were re-examined together by the two readers until a consensus was reached (Khan and Khan 2009). …”

Section: Methodsmentioning

confidence: 99%

“…Several studies have focused on comparing ages enumerated from different bony structures in an attempt to quantify the precision and to identify possible bias associated with each structure. Comparisons of age estimates from various structures have been studied for many species such as Barbus rajanorum mystaceus (Polat 1987a), Capoeta trutta (Polat 1987b), Labeo rohita, Catla catla, and Channa marulius (Khan and Khan 2009), Cyprinus carpio (Phelps et al 2007), and Salvelinus confluentus (Zymonas and McMahon 2009).…”

Section: Introductionmentioning

confidence: 99%

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Precision of aging structures for Indian major carp,Cirrhinus mrigala, from the River Ganga

Khan

Miyan

2011

Journal of Freshwater Ecology

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Scales, opercular bones, otoliths, vertebrae, and dorsal fin rays were compared to ascertain the best aging structure of Cirrhinus mrigala. All structures showed alternating opaque and translucent bands that were interpreted as annuli; however, structures differed greatly in the clarity of their presumed annual marks. Age estimates were compared by calculating the percentage of agreement (PA), average percentage of error (APE), and coefficient of variation (CV) and by constructing age bias plots. Age estimates were evaluated between readers and between the pairs of aging structures. Among all structures, scales showed the clearest annual rings and had highest (94.6%) PA between readers, followed by opercular bones (88.6%), otoliths (83.9%), vertebrae (79.9%), and dorsal fin rays (62.4%). Due to highest PA and lower minimal aging error, the scales were considered the most reliable bony structure for aging C. mrigala. When scale ages were compared with those of the other structures, the highest PA and lowest APE and CV values were found between scale and opercular bone estimates. Mean values of age estimate from scales were comparable ( p40.05) to the values obtained from opercular bones, otoliths, and vertebrae and were significantly ( p50.05) different with the dorsal fin ray age estimates. Scales were the most suitable structures for age estimation in C. mrigala.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…In case of disagreement between readers, the aging structures were re-examined together by the two readers until a consensus was reached (Khan and Khan 2009). …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precision of aging structures for Indian major carp,Cirrhinus mrigala, from the River Ganga

Khan

Miyan

2011

Journal of Freshwater Ecology

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Age validation, and comparison of otolith, vertebra and opercular bone for estimating age of Schizothorax o’connori in the Yarlung Tsangpo River, Tibet

Xie

Huo

et al. 2010

Environ Biol Fish

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A collection of 514 Schizothorax o'connori was made between August 2008 and August 2009 from Yarlung Tsangpo River to assess the suitability of three bony structures for age estimation. The annulus characteristics of otolith, vertebra and opercular bone were described. Location of the first annulus was validated by daily growth increment (DGI) analysis in the otoliths. Annual periodicity was verified by marginal increment ratio (MIR) analysis in otoliths and edge analysis in vertebrae and opercular bones. Annuli formed, once a year, between March and May for all three bony structures. Otoliths, vertebrae and opercular bones were examined to determine which structure produced the most precise and accurate age estimates in S. o'connori. Vertebrae and otoliths matched closely for the first 21 years of life, while opercular bones appeared to underestimate age. For older fish, the counts diverged and otoliths consistently providing higher age estimates. Sectioned otoliths proved to be the most precise and accurate structure for age estimation. The oldest observed schizothoracine fish was 50, more than twice the longevity previously accepted in S. o'connori.

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Comparative analysis of three methods of making scale specimens for small fish

et al. 2014

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Comparison of age estimates from scale, opercular bone, otolith, vertebrae and dorsal fin ray in Labeo rohita (Hamilton), Catla catla (Hamilton) and Channa marulius (Hamilton)

Cited by 39 publications

References 24 publications

Precision of aging structures for Indian major carp,Cirrhinus mrigala, from the River Ganga

Precision of aging structures for Indian major carp,Cirrhinus mrigala, from the River Ganga

Age validation, and comparison of otolith, vertebra and opercular bone for estimating age of Schizothorax o’connori in the Yarlung Tsangpo River, Tibet

Comparative analysis of three methods of making scale specimens for small fish

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