Studies on fecundity of snow trout Schizothorax richardsonii (Gray) from the lotic bodies of Rajouri district (J&amp;K).

Gandotra, Roopma; Shanker, Ravi; Singh, Dharm Veer

doi:10.12944/cwe.4.1.19

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…However, in this study a strong positive correlation was established between ovary weight as indirect indicator of fecundity and length of fish. The relationship between ovary weight and fish length of this species is in agreement with the findings of Gandotra et al (2009), Gandotra et al (2008 and Rahman and Haque (2008).…”

Section: Discussionsupporting

confidence: 91%

“…In the present study relative fecundity of S. richardsonii varied greatly among different body weight fishes and a negative correlation was established between the fish weight and fecundity ( Figure 5). This contrasts to the findings of other studies; an increase in body weight has accompanied by an improvement in egg number of S. richardsonii of Kasmir, India (Gandotra et al, 2009) and rainbow trout (Gall, 1975;Mulmi et al, 2010). Thorpe et al (1984) have advocated that egg production varies among individuals and populations of fish species due to differences in age and size.…”

Section: Discussioncontrasting

confidence: 72%

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Studies on gonadosomatic index, fecundity and hatchability of domesticated stock of asala Schizothorax richardsonii (Gray) from Nallu River of Lalitpur District

Wagle

2015

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The present work embodies studies on the reproductive capacity of captive stock of asala Schizothorax richardsonii collected from Nallu River of Lalitpur district. Gonadosomatic index (GSI) estimates ranged from 3.08±0.9% in May to 26.55±1.8% in November. Positive correlation (r=0.667) was found between egg size and GSI. The egg size (2.7 to 2.9 mm) in October and November was significantly (P<0.01) larger than the eggs measured in other months. Based on peak GSI level, S. richardsonii spawned by manual stripping in two breeding season i.e. winter (October-November) and summer (MachApril) in Godawari (1500 masl). Mean incubation period of fertilized eggs was 259 h and 248 h during winter and summer season at 14.2 to17.5 o C and 14.5 to15.5 o C water temperature, respectively. Percent hatching rates of eggs ranged between 38 to 90% and were not significantly different (P>0.05) between breeding seasons. Overripe eggs obtained during winter season breeding (16.5%) were significantly higher (P<0.01) than the summer season breeding (3.6%). This suggests that more frequent observation of the spawner is necessary during winter season for recognizing their appropriateness to ovulation.

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Section: Discussionsupporting

confidence: 91%

Section: Discussioncontrasting

confidence: 72%

Studies on gonadosomatic index, fecundity and hatchability of domesticated stock of asala Schizothorax richardsonii (Gray) from Nallu River of Lalitpur District

Wagle

2015

Our Nature

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“…This supported the view of Cushing (1968) that fecundity is known to vary within species with latitude and location. Gandotra et al, (2009) stated Schizothorax richardsonii as a medium fecund fish with the fecundity ranging from 3032 to 13321 eggs which was similar range to the finding of G. telchitta of present study.…”

Section: Relationship Between Fecundity (F) and Ovary Weight (Ow)supporting

confidence: 90%

Fecundity of Glyptothorax telchitta (Hamilton, 1822) from Tamor River, Nepal

et al. 2023

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The present study assesses the fecundity of Glyptothorax telchitta, a hill stream fish from the Tamor River, Nepal. A total of 60 specimens were collected from the Tamor River, with the help of local fishermen between March 2019 and February 2020. The absolute fecundity ranged from 3385 to 14298 eggs with the mean absolute fecundity of 9448.469 ± 607.783. The fish was found to be a medium fecund fish. Relative fecundity ranged from 151 to 529 eggs per gram body weight with mean relative fecundity of 371.38 ± 15.72. Fecundity showed significant positive correlations with ovary weight (r = 0.858) total length (r = 0.844) and total weight (r = 0.825). This indicated that fecundity dependent is mostly on ovary weight. Gonado-somatic index scored the peak values during March (15.15%) and May (15.01%), indicating the fish’s spawning period during the spring season. Egg sizes varied from 0.382 mm to 1.149 mm. The appearance of various sizes of eggs in a single ovary indicated that the fish was a fractional spawner. The ovaries occupied maximum space in the abdomen during the breeding season.

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“…Reproductive biology Schizothorax sp. has also been investigated in Kashmir and other locations (Wagle, 2015;Sunder and Subla 2013;Sabha et al, 2017;Roy et al, 2011;Roopam et al, 2009;Qadri et al, 2013;Gandotra et al, 2009;Jan et al, 2014). In our present paper, we documented the fecundity of Schizothorax sp.…”

Section: Introductionsupporting

confidence: 74%

Adaptive skill of Schizothorax sp. of river Alaknanda under long term pressure of urbanization and anthropogenic activities in Garhwal Himalaya

Thapliyal¹,

Bahuguna

Thapliyal

2019

Env. Cons. J.

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It is universally accepted that humans are having a major impact on every aspect of earth's ecological habitats because humans are engaged in urbanization and anthropogenic activity. All the major watershed areas of Garhwal Himalayan region (Alaknanda, Bhagarathi/Ganges and Yamuna) have witnessed urbanization and anthropogenic activity. One hydroelectric power project (330 MW) is located on river Alaknanda at Srinagar Garhwal in Garhwal Himalaya. The project started during the mid1990s by GVK group and completed around 2014. A long term study on fecundity of Schizothorax sp. at Srinagar Garhwal was carried out between the years 1996 to 1998. This study was compared to other recent studies on same species at same location between the years 2016-19. This period covers the entire timeline of construction phase to commissioning phase of this hydroelectric power project. Various parameters with reference to breeding biology and fecundity were measured from Schizothorax sp. Mature specimens ranging in average weight from 384g to 1482g and average length from 320mm to 544mm were observed. Weight of ovary in the fish fluctuated from 38g to 219g. Fecundity of samples varied from a minimum to 3009 to a maximum of 13649 to 13840. The mathematical relationship of fecundity with other variables viz: fish length, fish weight, ovary weight and ovary length, and between fish weight and ovary weight and ovary length was calculated. The computed relationships were found to be highly significant especially between fecundity and fish length (r=0.940, p<0.01), fecundity and fish weight (r=0.937, p<0.01) and fecundity and ovary volume (r=0.913, p>0.01). The values of regression coefficient (b) and correlation coefficient (r) were computed separately. The data when compared to recent data of other authors reveals that Schizothorax sp. have sustained their fecundity due to their unique adaptive skill but have shifted their breeding grounds slightly. This shifting of breeding ground might be due to anthropogenic activity. Further studies would be needed to see if the breeding grounds are also restored.

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Studies on fecundity of snow trout Schizothorax richardsonii (Gray) from the lotic bodies of Rajouri district (J&K).

Cited by 3 publications

References 9 publications

Studies on gonadosomatic index, fecundity and hatchability of domesticated stock of asala Schizothorax richardsonii (Gray) from Nallu River of Lalitpur District

Studies on gonadosomatic index, fecundity and hatchability of domesticated stock of asala Schizothorax richardsonii (Gray) from Nallu River of Lalitpur District

Fecundity of Glyptothorax telchitta (Hamilton, 1822) from Tamor River, Nepal

Adaptive skill of Schizothorax sp. of river Alaknanda under long term pressure of urbanization and anthropogenic activities in Garhwal Himalaya

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