De grootste kennisbank van het HBO

Inspiratie op jouw vakgebied

Vrij toegankelijk

Terug naar zoekresultatenDeel deze publicatie

Food availability of a blue mussel longline production site

Rechten: Alle rechten voorbehouden

Food availability of a blue mussel longline production site

Rechten: Alle rechten voorbehouden

Samenvatting

Viskwekerij Neeltje Jans is cultivating Blue Mussels Mytilus edulis on longlines in the former working docks of Neeltje Jans, an artificial island located in between the storm surge barrier in the west of the Eastern Scheldt. Approximately 700 to 800 kilometers of longline is situated at Neeltje Jans. Annually around 350 kilometers of longline is harvested which produces around 6•105 kg of mussels. Harvesting is done in spring and early summer, before mussels from conventional bottom culture are harvested. Mussels spat is stocked in socking in late summer and early fall with a density of 800 gm-1. Within 24 months spat will reach consumption size.
To keep mussel cultivation profitable, yield is required to increase. Theoretical maximum yield and practice yield prove to be far apart. Therefore research is carried out to increase the gain more insight in factors influencing the yield and make cultivation more sustainable. The cultivation dock is enclosed by a dike, with only a small opening to the Eastern Scheldt, enabling the tide to come in and leave the system.The province has made plans to alter the spatial planning of the cultivation site. A passage within a dike in the cultivation system is to be closed. Questions of the cultivator are on how this might influence the hydrology of the cultivation site and therefore the food availability of mussels.
During this research the hydrology was simulated by entering measuring bottom depth data into a SOBEK model. This SOBEK model gave information about the distribution of water flow in the cultivation system during incoming and outgoing tide. Information about water flow and distribution formed input for a mathematical boxmodel, where grazing pressure and stocking density was incorporated to simulate the cultivation site. In this boxmodel effects on the food availability was modelled for a situation where the passage were to be closed.

Boxmodel simulations show that closing of the passage will result in tidal discharge entering and leaving the cultivation site facing more resistance entering and leaving (tidal influence is muffled). Tidal exchange will decrease with 12.7% in box 4. Water flow is restricted which affects the volume entering compartments furthest away from the opening with the Eastern Scheldt and the corresponding food availability, resulting in a smaller volume is exchanged each tide. After closing of the passage food availability will drop in box 4 with 54%, whilst chlorophyll-a concentrations rise in box 1, 2 and 3 (with 1.06%, 10.27% and 28% respectively).

Toon meer
OrganisatieHZ University of Applied Sciences
OpleidingWatermanagement/ Aquatische Ecotechnologie
AfdelingDelta Academy
PartnersHZ University of Applied Sciences, Delta Academy - Research Group Aquaculture in Delta Areas
Datum2015-04-24
TypeBachelor
TaalEngels

Op de HBO Kennisbank vind je publicaties van 26 hogescholen

De grootste kennisbank van het HBO

Inspiratie op jouw vakgebied

Vrij toegankelijk