Age Structure of Roughhead Grenadier (Macrourus berglax) in the Northwest Atlantic, 1985
Keys for converting roughhead grenadier (Macrourus berglax) length distributions into age were made using samples collected in a bottom trawl survey in NAFO Div. 0B, 2G, 2H and 3K in 1985 at 610–1 240 m depths. Ageing was done on scales using polarized transmitted light. Age structure of catches fro...
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.613.1240 http://archive.nafo.int/open/studies/s20/savvatim.pdf |
| Summary: | Keys for converting roughhead grenadier (Macrourus berglax) length distributions into age were made using samples collected in a bottom trawl survey in NAFO Div. 0B, 2G, 2H and 3K in 1985 at 610–1 240 m depths. Ageing was done on scales using polarized transmitted light. Age structure of catches from all these Divisions were found to be similar. Linear growth was expressed by exponential functions and the von Bertalanffy formula, and weight by exponential functions and the Gompertz formula. Length-weight relationships were satisfactorily described by exponential functions. The materials confirmed the rela-tively slow growth and multiaged structure of M. berglax in the sample area. |
|---|