00258nam a2200097Ia 4500080001800000100002100018245007000039260002200109300001000131583001900141  a18.01.01 S446  aSecretan, P.A.D.  aAquaculture and risk management/ By P.A.D. Secretan and C.E. Nash  bFAOaRomeITc1989  a32 p.  c3/7/00kM2LMGR