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Original Articles

Age and growth of Schizothorax waltoni (Cyprinidae: Schizothoracinae) in the Yarlung Tsangpo river, China

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Pages 346-354 | Received 07 Feb 2014, Accepted 05 May 2016, Published online: 09 Jun 2016

Figures & data

Figure 1. Sampling locations of S. waltoni in the Yarlung Tsangpo River.

Figure 1. Sampling locations of S. waltoni in the Yarlung Tsangpo River.

Figure 2. Proximal (b), distal (a), and dorsal (c) faces of a whole lapillus under a dissecting microscope with reflected light, from an 8-yr old S. waltoni (338 mm standard length (SL)). The axes along which the otolith length (OL) and breadth (OB) were measured are indicated. The otolith (c) was placed inside digital calipers to measure the thickness (OT). Scale bars = 0.5 mm.

Figure 2. Proximal (b), distal (a), and dorsal (c) faces of a whole lapillus under a dissecting microscope with reflected light, from an 8-yr old S. waltoni (338 mm standard length (SL)). The axes along which the otolith length (OL) and breadth (OB) were measured are indicated. The otolith (c) was placed inside digital calipers to measure the thickness (OT). Scale bars = 0.5 mm.

Figure 3. Distributions of the standard length frequency of S. waltoni.

Figure 3. Distributions of the standard length frequency of S. waltoni.

Figure 4. Length-weight relationships of S. waltoni.

Figure 4. Length-weight relationships of S. waltoni.

Figure 5. Mean monthly MIR for S. waltoni lapillus otoliths with 1–8 annuli, error bars represent the SD.

Figure 5. Mean monthly MIR for S. waltoni lapillus otoliths with 1–8 annuli, error bars represent the SD.

Figure 6. Relationships between otolith dimensions (length, breadth, thickness, and weight) and fish length/age of S. waltoni, n = 1061.

Figure 6. Relationships between otolith dimensions (length, breadth, thickness, and weight) and fish length/age of S. waltoni, n = 1061.

Figure 7. Sectioned lapillus of S. waltoni with 467 mm SL, estimated to be 22 yr old under transmitted light using the compound microscope. Dots represent annuli. Scale bar = 0.1 mm.

Figure 7. Sectioned lapillus of S. waltoni with 467 mm SL, estimated to be 22 yr old under transmitted light using the compound microscope. Dots represent annuli. Scale bar = 0.1 mm.

Table 1. Number of specimens and Mean ± SD and range of standard length at age of S. waltoni.

Figure 8. The von Bertalanffy growth curve of S. waltoni with the observed standard length at age estimated from otoliths. The length-at-age data of the undetermined specimens were included in models fitting both sexes (except for two 9 yr old individuals).

Figure 8. The von Bertalanffy growth curve of S. waltoni with the observed standard length at age estimated from otoliths. The length-at-age data of the undetermined specimens were included in models fitting both sexes (except for two 9 yr old individuals).

Table 2. Comparison of growth characters of Schizothoracinae fish in different studies.