Timing and location of spawning of  Blue Grenadier, Macruronus novaezelandiae (Teleostei: Merlucciidae), In Australian Coastal Waters

Js, Gunn; Bruce, B. D.; Furlani, DM; Thresher, RE; Blaber, S. J. M.

doi:10.1071/mf9890097

Cited by 23 publications

(20 citation statements)

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“…The spawning period of hoki generally runs from the end of June to mid September (Langley 1993) although spawning behaviour can be affected by water temperature. In a warmer year off Tasmania, the spawning season of hoki was delayed by 2 weeks compared with a cooler year (Gunn et al 1989). The SOI in autumn seemed to be more important than during winter.…”

Section: Best Subset Regressionmentioning

confidence: 95%

Links between climate variation and the year class strength of New Zealand hoki (Macruronus novaezelandiae) Hector

Livingston¹

2000

New Zealand Journal of Marine and Freshwater Research

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Hoki (Macruronus novaezelandiae)Hector year class strength (YCS) varies substantially from year to year. In this study, potential links between hoki YCS estimates for western and eastern stocks, and time series of the Southern Oscillation Index (SOI), satellite sea surface temperatures (SST), synoptic weather patterns, depth of the mixed layer (western stock only), and wind speeds are explored. The results indicate that favourable recruitment in the western stock is correlated with a negative SOI and associated conditions such as lower SSTs, early onset of deep water mixing and synoptic weather patterns that result in a higher incidence of southwest (SW) flow. Favourable recruitment in the eastern stock appears to be correlated with periods of westerly flow, particularly from the SW, but also the north-west (NW). Regression studies showed that when inter-correlation was minimised, 95% of the variation in YCS of the western stock was explained by four variables-SOI in autumn, the onset of winter mixing, SST in spring, and NW spring weather patterns. In the eastern stock, 88% of the variation in YCS was explained by SW and NW winter weather patterns and the average speed of SW winds in winter through Cook Strait. Although the underlying mechanisms are not proven, the climate variables which appear to be linked to favourable recruitment for both western and eastern stocks, also favour upwelling and the physical transportation of larval hoki from the spawning grounds into their respective inshore nursery areas. M99026

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Section: Best Subset Regressionmentioning

confidence: 95%

Links between climate variation and the year class strength of New Zealand hoki (Macruronus novaezelandiae) Hector

Livingston¹

2000

New Zealand Journal of Marine and Freshwater Research

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“…Then the samples of the central portion of the gonads of 0.5 cm thickness were put into the cassettes separately for histological examination. They were dehydrated in graded alcohol series, embedded in paraffin, sectioned for 5-7 μm in thickness using a microtome (MICROM HM355S, Germany) and stained with Haematoxylin and Eosin, then mounted in DPX mountant and photographed with an OLYMPUS-CX41 microscope which was equipped with the SONY DSC-W220 camera (Gunn et al 1989). At least two glass slides were prepared for each ovary or testis.…”

Section: Methodsmentioning

confidence: 99%

“…The gonads were removed by abdominal dissection and weighed to the nearest gram. The gonadosomatic index (GSI) was obtained according to the equation: GSI = GW/ (TW-GW) x 100, where: GW = gonad weight, and TW = total body weight (Gunn et al 1989). Then the gonad samples were preserved in 10 % buffered formalin and kept at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Cyclic variations of gonad development of an air-breathing fish, Channa striata in the lentic and lotic environments

et al. 2016

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The study was conducted to know the cyclic changes in gonadal maturation and to investigate the developmental stages of oocytes and testicular germ cells of an air-breathing fish, Channa striata. Fish were sampled monthly from lentic and lotic environments of three geographical locations of Bangladesh from December to November and the histological analysis of their gonad was done to evaluate the objectives. The highest mean GSI was 5.95 ± 0.20 for female in July and 0.14 ± 0.01 for male also in July showing that the gonadal development reached its peak during this month. The highest mean oocyte diameter was 1257.50 ± 24.17 μm observed in July implying that the oocyte reached maturity in this month. Histological study of ovary revealed the evidence of early yolk granule stage and late yolk granule stage from April to July. In case of male four stages of spermatogenesis were distinguished and spermatozoa were highly abundant in June and July. So the monthly pooled values of GSI and the analysis of gonadal histology indicated that the peak breeding season of C. striata occurred in July in the lentic and lotic environments. Samples collected from lentic and lotic habitats are suggestive of no difference in the development of the gonad. The results of the present study will be useful for selective breeding programme, conservation and sustainable fishery management of C. striata in its natural habitat.

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“…Gonado Somatic index (GSI) was calculated as percentage Gonad weight per body weight (Cailliet et al, 1986, Gunn et al, 1989.…”

Section: Gonado Somatic Index (Gsi)mentioning

confidence: 99%

Aspect of Reproductive Biology of Fish of Commercial Importance in Sabke Reservoir, Katsina State

Bala¹,

Sudi²

2012

Bayero J. Pure App. Sci.

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Aspects of the reproductive biology of the most economically important fish species in Sabke reservoir was investigated such as Fecundity for females, average egg diameter, Gonado Somatic Index (GSI), for a period of twelve month (from March 2009 to February 2010).Samples of fish were collected through both experimental gears and commercial catches from local fishermen fortnightly. Fecundity range of 222 -9642, and mean of

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Timing and location of spawning of Blue Grenadier, Macruronus novaezelandiae (Teleostei: Merlucciidae), In Australian Coastal Waters

Cited by 23 publications

References 0 publications

Links between climate variation and the year class strength of New Zealand hoki (Macruronus novaezelandiae) Hector

Links between climate variation and the year class strength of New Zealand hoki (Macruronus novaezelandiae) Hector

Cyclic variations of gonad development of an air-breathing fish, Channa striata in the lentic and lotic environments

Aspect of Reproductive Biology of Fish of Commercial Importance in Sabke Reservoir, Katsina State

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