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Estimation of egg numbers in pacific herring clupea harengus pallasi spawns on giant kelp macrocystis sp



Estimation of egg numbers in pacific herring clupea harengus pallasi spawns on giant kelp macrocystis sp



North American Journal of Fisheries Management 5(1): 65-71



Stock assessments of Pacific herring (C. h. pallasi) in British Columbia [Canada] are based on estimates of egg description. Herring lay their adhesive eggs on sea grasses and algae, including the giant kelp (Macrocystis sp.). Herring spawns were studied by scuba divers at 4 sites in the Queen Charlotte Islands where the giant kelp occurred at different densitites. Two predictive models for estimating eggs on giant kelp were developed. The simpler relationship, which explained 52% of the variation in total egg numbers, requires observations on layers of eggs and an estimate of the number of giant kelp blades. The other relationship, which explained 85% of the variationin total egg numbers, requires observations on the layers of eggs and estimates of the number of giant kelp fronds per plant and plant biomass. These observations and measurements, as well as the determination of the area of a spawn, could be madeaccurately only through a survey by scuba divers. Eggs are also depositied on the vegetation and bottom substrate beneath the giant kelp canopy and these estimated separately. In locations where the density of giant kelp plants was high, up to 75% of the eggs were laid on this species, but spawn on giant kelp accounted for only 7% of total egg deposition where plant density was low. The estimate of spawners per kilometer of beach ranged from 78-769 tonnes at the 4 site.

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Accession: 005387297

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